SEC Form N-CSRS filed by abrdn Healthcare Investors Shares of Beneficial Interest

6/8/26 4:07:53 PM ET

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N-CSRS 1 tm262258d11_ncsrs.htm N-CSRS

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number:	811-04889

Exact name of registrant as specified in charter:	abrdn Healthcare Investors

Address of principal executive offices:	1900 Market Street, Suite 200 Philadelphia, PA 19103

Name and address of agent for service:	Sharon Ferrari
	abrdn Inc.
	1900 Market Street Suite 200
	Philadelphia, PA 19103

Registrant’s telephone number, including area code:	1-800-522-5465

Date of fiscal year end:	September 30

Date of reporting period:	March 31, 2026

Item 1. Reports to Stockholders.

(a) A copy of the report transmitted to shareholders pursuant to Rule 30e-1 under the Investment Company Act of 1940 (the “1940 Act”) is filed herewith.

abrdn Healthcare Investors (HQH)

Semi-Annual Report

March 31, 2026

aberdeeninvestments.com

Managed Distribution Policy (unaudited)

The Board of Trustees (the "Board") of the abrdn Healthcare Investors (the “Fund”) has authorized a managed distribution policy (“MDP”) of paying quarterly distributions at an annual rate, set once a year, that is a percentage of the rolling average of the Fund’s net asset values over the preceding three month period ending on the last day of the month immediately preceding the distribution’s declaration date (the "Distribution Policy"). The Distribution Policy is subject to regular review by the Board. The Distribution Policy seeks to provide investors with a distribution out of current income, supplemented by realized capital gains and, to the extent necessary, paid-in capital.

With each distribution, the Fund will issue a notice to shareholders and an accompanying press release which will provide detailed information regarding the estimated amount and composition of the distribution and other information required by the Fund’s MDP exemptive order. The Board may amend or terminate the MDP at any time without prior notice to shareholders; however, at this time, there are no reasonably foreseeable circumstances that might cause the termination of the MDP. You should not draw any conclusions about the Fund’s investment performance from the amount of distributions or from the terms of the Fund’s MDP.

Distribution Disclosure Classification (unaudited)

The Fund’s policy is to provide investors with a stable distribution rate. Each quarterly distribution will be paid out of current income, supplemented by realized capital gains and, to the extent necessary, paid-in capital.

The Fund is subject to U.S. corporate, tax and securities laws. Under U.S. tax rules, the amount applicable to the Fund and character of distributable income for each fiscal period depends on the actual exchange rates during the entire year between the U.S. Dollar and the currencies in which the Fund's assets are denominated and on the aggregate gains and losses realized by the Fund during the entire year.

Therefore, the exact amount of distributable income for each fiscal year can only be determined as of the end of the Fund’s fiscal year, September 30. Under Section 19 of the Investment Company Act of 1940, as amended (the “1940 Act”), the Fund is required to indicate

the sources of certain distributions to shareholders. The estimated distribution composition may vary from quarter to quarter because it may be materially impacted by future income, expenses and realized gains and losses on securities and fluctuations in the value of the currencies in which the Fund assets are denominated.

Based on generally accepted accounting principles, the Fund estimates the distributions for the fiscal year commenced October 1, 2025 through the distributions declared on May 11, 2026 consisted of 81% net realized short-term capital gains and 19% net realized long-term capital gains.

In January 2027, a Form 1099-DIV will be sent to shareholders, which will state the final amount and composition of distributions and provide information with respect to their appropriate tax treatment for the 2026 calendar year.

abrdn Healthcare Investors

Letter to Shareholders (unaudited)

Dear Shareholder,

We present the Semi-Annual Report, which covers the activities of abrdn Healthcare Investors (the “Fund”), for the six-month period ended March 31, 2026. The Fund’s investment objective is to seek long-term capital appreciation by investing primarily in equity and related securities (including securities subject to legal or contractual restrictions on resale) of U.S. and foreign companies principally engaged in the healthcare industries ("Healthcare Companies"). In addition, the Fund seeks to provide regular distribution of realized capital gains.

Total Investment Return¹

For the six-month period ended March 31, 2026, the total return to shareholders of the Fund based on the net asset value (“NAV”) and market price of the Fund, respectively, compared to the Fund’s benchmark, is as follows:

NAV²^,³	7.66%
Market Price²	2.76%
80% Nasdaq Biotechnology Index, 20% S&P Composite 1500 Health Care Index⁴	17.11%

For more information about Fund performance, please visit the Fund on the web at www.aberdeenhqh.com. Here, you can view quarterly commentary on the Fund's performance, monthly fact sheets, distribution and performance information, and other Fund literature.

NAV, Market Price and Premium(+)/Discount(-)

The below table represents a comparison between the current six-month period end and the prior fiscal year end of the Fund's market price to NAV and associated Premium(+) and Discount(-).


	NAV	Closing Market Price	Premium(+)/ Discount(-)
3/31/2026	$19.88	$17.79	-10.51%
9/30/2025	$19.70	$18.46	-6.29%

During the six-month period ended March 31, 2026, the Fund’s NAV was within a range of $18.97 to $21.84 and the Fund’s market price traded within a range of $17.25 to $20.46. During the six-month period ended March 31, 2026, the Fund’s shares traded within a range of a premium(+)/discount(-) of -11.63% to -2.21%.

Managed Distribution Policy

The Fund has a managed distribution policy of paying quarterly distributions at an annual rate, set by the Board of Trustees (the "Board") once a year, as a percentage of the rolling average of the Fund’s NAV over the preceding three month period ending on the last day of the month immediately preceding the distribution’s declaration date. The Fund's current annualized distribution rate is 12%. This policy will be subject to regular review by the Board. The distributions will be made from current income, supplemented by realized capital gains and, to the extent necessary, paid-in capital, which is a nontaxable return of capital.

On May 11, 2026, the Fund announced that it will pay on June 30, 2026, a stock distribution of US $0.61 per share to all shareholders of record as of May 21, 2026. This stock distribution will automatically be paid in newly issued shares of the Fund unless otherwise instructed by the shareholder. Shares of common stock will be issued at the lower of the NAV per share or the market price per share with a floor for the NAV of not less than 95% of the market price. Fractional shares will generally be settled in cash, except for registered shareholders with book entry accounts at Computershare Investor Services who will have whole and fractional shares added to their account.

Shareholders may request to be paid their quarterly distributions in cash instead of shares of common stock by providing advance notice to the bank, brokerage or nominee who holds their shares if the shares are in “street name” or by filling out in advance an election card received from Computershare Investor Services if the shares are in registered form.

The Fund is covered under exemptive relief received by the Fund’s investment manager from the U.S. Securities and Exchange Commission (“SEC”) that allows the Fund to distribute long-term capital gains as frequently as quarterly in any one taxable year.

{foots1}

Past performance is no guarantee of future results. Investment returns and principal value will fluctuate and shares, when sold, may be worth more or less than original cost. Current performance may be lower or higher than the performance quoted. NAV return data include investment management fees, custodial charges and administrative fees (such as Trustee and legal fees) and assumes the reinvestment of all distributions.

{foots1}

²	Assuming the reinvestment of dividends and distributions.

{foots1}

³	The Fund’s total return is based on the reported NAV for each financial reporting period end and may differ from what is reported on the Financial Highlights due to financial statement rounding or adjustments.

{foots1}

⁴

The NASDAQ Biotechnology Index is an unmanaged stock market index made up of securities of NASDAQ-listed companies classified according to the Industry Classification Benchmark as either the Biotechnology or the Pharmaceutical industry. The S&P Composite 1500^® Health Care Index is an unmanaged index that comprises those companies included in the S&P Composite 1500 that are classified as members of the GICS^® Health Care sector. Indexes are unmanaged and have been provided for comparison purposes only. No fees or expenses are reflected. You cannot invest directly in an index.

abrdn Healthcare Investors

Letter to Shareholders (unaudited) (concluded)

Unclaimed Share Accounts

Please be advised that abandoned or unclaimed property laws for certain states require financial organizations to transfer (escheat) unclaimed property (including Fund shares) to the state. Each state has its own definition of unclaimed property, and Fund shares could be considered “unclaimed property” due to account inactivity (e.g., no owner-generated activity for a certain period), returned mail (e.g., when mail sent to a shareholder is returned to the Fund's transfer agent as undeliverable), or a combination of both. If your Fund shares are categorized as unclaimed, your financial advisor or the Fund's transfer agent will follow the applicable state’s statutory requirements to contact you, but if unsuccessful, laws may require that the shares be escheated to the appropriate state. If this happens, you will have to contact the state to recover your property, which may involve time and expense. For more information on unclaimed property and how to maintain an active account, please contact your financial advisor or the Fund's transfer agent.

Open Market Repurchase Program

The Board has approved an open market repurchase and discount management policy (the “Program”). The Program allows the Fund to purchase, in the open market, up to 12% of its outstanding common shares, with the amount and timing of any repurchase determined at the discretion of the Fund's investment adviser. Such purchases may be made opportunistically at certain discounts to NAV per share in the reasonable judgment of management based on historical discount levels and current market conditions. If shares are repurchased, the Fund reports repurchase activity on its website on a monthly basis. For the six-month period ended March 31, 2026, the Fund did not repurchase any shares through the Program.

On a quarterly basis, the Board will receive information on any transactions made pursuant to this policy during the prior quarter.

Portfolio Holdings Disclosure

The Fund's complete schedule of portfolio holdings for the second and fourth quarters of each fiscal year are included in the Fund's semi-annual and annual reports to shareholders. The Fund files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. These reports are available on the SEC’s website at http://www.sec.gov. The Fund makes the information available to shareholders upon request and without charge by calling Investor Relations toll-free at 1-800-522-5465.

Proxy Voting

A description of the policies and procedures that the Fund uses to determine how to vote proxies relating to portfolio securities and information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended

June 30 is available by August 31 of the relevant year: (1) upon request without charge by calling Investor Relations toll-free at 1-800-522-5465; and (2) on the SEC’s website at www.sec.gov.

Investor Relations Information

As part of Aberdeen's commitment to shareholders, we invite you to visit the Fund on the web at www.aberdeenhqh.com. Here, you can view monthly fact sheets, quarterly commentary, distribution and performance information, as well as other Fund literature. Enroll in Aberdeen's email services to receive content related to your fund. In addition, you will receive monthly factsheets based on your preferences. Sign up today at www.aberdeenhqh.com.

•	Visit: www.aberdeenhqh.com

•	Email: Investor.Relations@aberdeenplc.com; or

•	Call: 1-800-522-5465 (toll free in the U.S.).

Yours sincerely,

/s/ Alan Goodson
Alan Goodson
President

{foots1}

All amounts are U.S. Dollars unless otherwise stated.

2	abrdn Healthcare Investors

Total Investment Return (unaudited)

The following table summarizes the average annual Fund performance compared to the Fund’s primary benchmark for the six-month (not annualized), 1-year, 3-year, 5-year and 10-year periods ended March 31, 2026.

	6 Months	1 Year	3 Years	5 Years	10 Years
Net Asset Value (NAV)	7.66%	28.11%	12.21%	6.39%	8.06%
Market Price	2.76%	24.66%	13.20%	4.55%	7.01%
80% Nasdaq Biotechnology Index, 20% S&P Composite 1500 Health Care Index	17.11%	30.65%	11.78%	5.46%	8.54%
Nasdaq Biotechnology Index	19.99%	38.53%	13.16%	5.15%	8.62%

Performance of a $10,000 Investment (as of March 31, 2026)

This graph shows the change in value of a hypothetical investment of $10,000 in the Fund for the periods indicated. For comparison, the same investment is shown in the indicated index.

Returns represent past performance. Total investment return at NAV is based on changes in the NAV of Fund shares and assumes reinvestment of dividends and distributions, if any, at market prices pursuant to the dividend reinvestment program sponsored by the Fund’s transfer agent. All return data at NAV includes fees charged to the Fund, which are listed in the Fund’s Statement of Operations under “Expenses.” Total investment return at market value is based on changes in the market price at which the Fund’s shares traded on the NYSE during the period and assumes reinvestment of dividends and distributions, if any, at market prices pursuant to the dividend reinvestment program sponsored by the Fund’s transfer agent. The Fund’s total investment return is based on the reported NAV as of the financial reporting period end date of March 31, 2026. Because the Fund’s shares trade in the stock market based on investor demand, the Fund may trade at a price higher or lower than its NAV. Therefore, returns are calculated based on both market price and NAV. Past performance is no guarantee of future results. The performance information provided does not reflect the deduction of taxes that a shareholder would pay on distributions received from the Fund or the sale of Fund shares. The current performance of the Fund may be lower or higher than the figures shown. The Fund’s yield, return, market price and NAV will fluctuate. Performance information current to the most recent month-end is available at www.aberdeenhqh.com or by calling 800-522-5465.

The annualized gross operating expense ratio based on the six-month period ended March 31, 2026 was 1.08%.

abrdn Healthcare Investors

Portfolio Summary (as a percentage of net assets) (unaudited)

As of March 31, 2026

Asset Allocation
Common Stocks	88.1%
Convertible Preferred Stocks	7.3%
Warrants	2.1%
Milestone Interests	1.8%
Convertible Notes	0.5%
Short-Term Investments	0.4%
Call Options Written	-
Liabilities in Excess of Other Assets	(0.2%)
	100.0%

Industries
Biotechnology	57.9%
Pharmaceuticals	22.5%
Health Care Equipment & Supplies	7.7%
Life Sciences Tools & Services	7.0%
Health Care Providers & Services	4.7%
Short-Term Investments	0.4%
Liabilities in Excess of Other Assets	(0.2%)
	100.0%

Top Ten Holdings
Vaxcyte, Inc.	3.1%
uniQure NV	3.0%
Amgen, Inc.	2.5%
Insmed, Inc.	2.4%
Argenx SE, ADR	2.3%
Tectonic Therapeutic, Inc.	2.1%
Denali Therapeutics, Inc.	2.0%
Xenon Pharmaceuticals, Inc.	2.0%
VeraDermics, Inc.	1.9%
Praxis Precision Medicines, Inc.	1.8%

4	abrdn Healthcare Investors

Portfolio of Investments (unaudited)

As of March 31, 2026

	Shares or Principal Amount		Value
Convertible Preferred Stocks^(a)^,(b)^,(c)—7.3%
Biotechnology—3.4%
Abcuro, Inc. Series B		532,816	$ 2,925,000
Abcuro, Inc. Series C1		117,926	712,120
Arbor Biotechnologies, Inc. Series B, 8.00%		82,076	1,359,999
Arbor Biotechnologies, Inc. Series C, 8.00%		827,250	3,399,998
Atalanta Therapeutics, Inc. Series B		1,777,778	1,600,000
Aviceda Therapeutics Series C		86,599	498,793
Glycomine, Inc. Series C, 8.00%		6,584,840	3,950,904
Hotspot Therapeutics, Inc. Series B, 6.00%		2,875,000	6,900,000
Hotspot Therapeutics, Inc. Series C, 6.00%		632,394	2,049,526
Incendia Therapeutics, Inc. Series A		1,769,383	641,755
Priothera Co. Ltd. Series A, 6.00%^(d)		346,666	40
Quell Therapeutics Ltd. Series B^(e)		1,798,941	3,739,998
Recode Therapeutics, Inc. Series B, 5.00%		331,413	3,060,003
Seismic Therapeutics, Inc. Series B		647,722	2,924,983
Third Arc Bio, Inc. Series A, 8.00%		2,409,466	5,069,998
			38,833,117
Health Care Equipment & Supplies—0.0%
IO Light Holdings, Inc. Series A2		421,634	42
Pharmaceuticals—3.9%
Biotheryx, Inc. Series E, 8.00%		1,295,238	654,484
Crystalys Therapeutics, Inc. Series A		2,328,492	2,332,800
Curasen Therapeutics, Inc. Series A^(d)		21,114,774	10,124,534
Curasen Therapeutics, Inc. Series B^(d)		3,219,587	1,543,792
Endeavor Group Holdings, Inc. Series B, 8.00%		657,322	3,099,996
Endeavor Group Holdings, Inc. Series C, 8.00%		121,377	791,936
Engrail Therapeutics, Inc., 8.00%		4,768,649	2,842,592
HiberCell, Inc. Series B		2,773,472	1,144,057
HiberCell, Inc. Series C		1,529,261	708,965
Nuvig Therapeutics, Inc. Series B		1,644,892	1,724,998
Qlaris Bio, Inc. Series B^(d)		4,394,904	3,450,000
VeraDermics, Inc. Series C		249,839	15,777,333
			44,195,487
Total Convertible Preferred Stocks			83,028,646
Convertible Notes^(a)^,(c)—0.5%
Biotechnology—0.3%
Hotspot Therapeutics, Inc., 6.00%, 04/12/28	$	720,872	720,872
Incendia Therapeutics, Inc., 8.00%, 04/18/26		1,569,230	1,569,230
Incendia Therapeutics, Inc., 10.00%, 09/09/26		547,370	547,370
HiberCell, Inc., 10.00%, 04/30/26		680,000	680,000
			3,517,472
Health Care Providers & Services—0.0%
Recode Therapeutics, Inc., 8.00%, 03/23/27		161,371	161,371
Pharmaceuticals—0.2%
HiberCell, Inc., 10.00%, 04/30/26		439,002	439,002

	Shares or Principal Amount		Value


Curasen Therapeutics, Inc., 8.00%, 03/31/26^(d)	$	1,029,195	$ 1,029,195
Qlaris Bio, Inc., 8.00%, 04/30/27^(d)		426,415	426,415
			1,894,612
Total Convertible Notes			5,573,455
Common Stocks—88.1%
Biotechnology—52.0%
Abivax SA, ADR^(b)		88,675	9,873,961
Alnylam Pharmaceuticals, Inc.^(b)		43,997	14,557,287
Amgen, Inc.		81,598	28,710,256
Apogee Therapeutics, Inc.^(b)		66,538	5,600,504
Arcus Biosciences, Inc.^(b)		300,310	6,486,696
Arcutis Biotherapeutics, Inc.^(b)		302,408	7,124,733
Argenx SE, ADR^(b)		36,476	26,636,599
Arrowhead Pharmaceuticals, Inc.^(b)		220,707	13,838,329
ARS Pharmaceuticals, Inc.^(b)		1,548,014	12,430,552
Ascendis Pharma AS, ADR^(b)		16,937	3,874,000
BioCryst Pharmaceuticals, Inc.^(b)		2,083,921	19,838,928
Chinook Therapeutics, Inc. CVR^(a)^,(b)^,(c)		91,800	29,376
Cogent Biosciences, Inc.^(b)		174,834	6,729,361
Corbus Pharmaceuticals Holdings, Inc.^(b)		778,031	7,305,711
Cytokinetics, Inc.^(b)		268,152	17,673,898
Denali Therapeutics, Inc.^(b)		1,189,730	22,842,816
Disc Medicine, Inc.^(b)		127,312	8,140,329
Dyne Therapeutics, Inc.^(b)		666,425	12,082,285
Evommune, Inc.^(b)		121,035	2,782,595
GRAIL, Inc.^(b)^,(f)		143,825	7,432,876
Ideaya Biosciences, Inc.^(b)		335,020	11,162,866
Immunic, Inc.^(b)		4,738,771	5,260,036
Immunocore Holdings PLC, ADR^(b)		66,916	2,017,517
Immunovant, Inc.^(b)		719,264	17,866,518
Insmed, Inc.^(b)		164,173	26,845,569
Ionis Pharmaceuticals, Inc.^(b)		78,900	5,924,601
Jade Biosciences, Inc.		589,729	8,285,692
Krystal Biotech, Inc.^(b)		18,725	4,837,042
Newamsterdam Pharma Co. NV^(b)		341,705	10,937,977
Nuvalent, Inc., Class A^(b)		67,883	6,954,613
Palvella Therapeutics, Inc.^(b)		54,759	6,825,709
Praxis Precision Medicines, Inc.^(b)		63,779	20,548,956
Regeneron Pharmaceuticals, Inc.		23,119	17,862,664
Revolution Medicines, Inc.^(b)		76,590	7,448,378
Rhythm Pharmaceuticals, Inc.^(b)		46,950	4,083,242
Sarepta Therapeutics, Inc.^(b)		941,560	20,488,346
Sera Prognostics, Inc., Class A^(b)		1,295,793	2,630,460
Sionna Therapeutics, Inc.^(b)		396,124	15,880,611
Soleno Therapeutics, Inc.^(b)		190,001	6,361,234
Summit Therapeutics, Inc.^(b)		427,133	8,098,442
Tectonic Therapeutic, Inc.^(b)		770,940	23,829,755
Travere Therapeutics, Inc.^(b)		353,234	10,494,582
TScan Therapeutics, Inc.^(b)		81,237	82,049
Twist Bioscience Corp.^(b)		48,802	2,319,071
uniQure NV^(b)^,(e)		2,094,039	34,237,538
Vaxcyte, Inc.^(b)		607,065	35,276,547
Vericel Corp.^(b)		295,881	9,518,492
Vertex Pharmaceuticals, Inc.^(b)		19,974	8,919,190
Vir Biotechnology, Inc.^(b)		100	896
Xenon Pharmaceuticals, Inc.^(b)		389,621	22,656,461
			591,646,146

abrdn Healthcare Investors

Portfolio of Investments (unaudited) (continued)

As of March 31, 2026

	Shares or Principal Amount		Value
Common Stocks (continued)
Health Care Equipment & Supplies—7.7%
Abbott Laboratories		188,375	$ 19,340,461
Becton Dickinson & Co.		24,459	3,845,689
Boston Scientific Corp.^(b)		115,455	7,244,801
Dexcom, Inc.^(b)		94,617	5,941,948
Inspire Medical Systems, Inc.^(b)		188,834	9,740,058
InspireMD, Inc.^(b)		1,503,519	2,450,736
Insulet Corp.^(b)		47,650	9,998,876
Intuitive Surgical, Inc.^(b)		30,243	13,941,721
Medtronic PLC^(e)		106,833	9,257,079
Tandem Diabetes Care, Inc.^(b)		288,261	5,525,963
Willow Laboratories, Inc.^(a)^,(b)^,(c)		160,000	16
			87,287,348
Health Care Providers & Services—4.7%
Acadia Healthcare Co., Inc.^(b)		169,720	3,969,751
CVS Health Corp.		75,912	5,452,000
Elevance Health, Inc.		34,806	10,189,456
GeneDx Holdings Corp.^(b)		73,549	4,723,317
Guardant Health, Inc.^(b)		49,905	4,609,725
Humana, Inc.		43,126	7,477,617
McKesson Corp.		2,045	1,769,661
Molina Healthcare, Inc.^(b)		48,380	6,449,054
NeoGenomics, Inc.^(b)		904,851	6,713,994
Tenet Healthcare Corp.^(b)		8,128	1,533,835
			52,888,410
Life Sciences Tools & Services—7.0%
Adaptive Biotechnologies Corp.^(b)		675,658	9,378,133
Charles River Laboratories International, Inc.^(b)		44,981	7,759,222
Codexis, Inc.^(b)		5,590,096	9,111,856
Danaher Corp.		85,463	16,203,785
ICON PLC^(b)		35,763	3,957,534
IQVIA Holdings, Inc.^(b)		19,691	3,358,103
Personalis, Inc.^(b)		2,057,518	13,106,390
Tempus AI, Inc., Class A^(b)		90,622	4,097,927
Thermo Fisher Scientific, Inc.		22,345	10,983,238
Waters Corp.^(b)		6,199	1,846,062
			79,802,250
Pharmaceuticals—16.7%
AgomAb Therapeutics NV, ADR^(b)		290,869	3,051,216
AstraZeneca PLC		41,123	8,110,278
Axsome Therapeutics, Inc.^(b)		75,942	12,835,717
Bristol-Myers Squibb Co.		107,510	6,520,482
Crinetics Pharmaceuticals, Inc.^(b)		508,242	18,459,349
Edgewise Therapeutics, Inc.^(b)		472,983	14,898,965
EyePoint, Inc.^(b)		1,122,373	14,467,388
Fulcrum Therapeutics, Inc.^(b)		693,447	5,318,738
Fusion Pharmaceuticals, Inc. CVR^(a)^,(b)^,(c)^,(e)		7,593	10,478
Jazz Pharmaceuticals PLC^(b)		76,231	14,411,471
LENZ Therapeutics, Inc.^(b)		784,386	7,177,132
Maze Therapeutics, Inc.^(b)		111,766	3,336,215
Merck & Co., Inc.		115,072	13,842,011
Ocular Therapeutix, Inc.^(b)		376,318	3,187,413
Oculis Holding AG^(b)^,(e)		579,536	15,409,862
Oculis Holding AG^(b)^,(e)		21,152	562,432
SpyGlass Pharma, Inc.^(b)		74,429	1,928,455
Structure Therapeutics, Inc., ADR^(b)		166,060	8,004,092
VeraDermics, Inc.^(b)		345,692	21,830,450

	Shares or Principal Amount		Value


WaVe Life Sciences Ltd.^(b)		400,000	$ 2,900,000
Zoetis, Inc.		115,469	13,649,591
			189,911,735
Total Common Stocks			1,001,535,889
Warrants^(b)—2.1%
Biotechnology—2.1%
Immunic, Inc.		5,247,245	5,824,442
Immunic, Inc., Series B(expiration date 6/30/2030, exercise price $0.75)^(a)		5,247,245	3,810,549
Immunic, Inc.		8,847,463	9,820,684
Immunic, Inc., Series C(expiration date 1/31/2027, exercise price $0.87)^(a)		8,847,463	4,292,789
			23,748,464
Health Care Providers & Services—0.0%
Recode Therapeutics, Inc.(expiration date 9/23/2035, exercise price $0.01)^(a)^,(c)		161,371	0
Pharmaceuticals^(a)^,(c)—0.0%
HiberCell, Inc.(expiration date 09/15/28, exercise price $0.46)		1,529,261	2
HiberCell, Inc.(expiration date 09/13/34, exercise price $0.08)		5,487,525	5
HiberCell, Inc.(expiration date 01/09/36, exercise price $0.08)		8,500,000	0
			7
Total Warrants			23,748,471
Short-Term Investment—0.4%
State Street Institutional U.S. Government Money Market Fund, Premier Class, 3.60%^(g)		4,216,579	4,216,579
Total Short-Term Investment			4,216,579
Total Investments Before Milestone Interests—98.4% (Cost $925,339,960)			1,118,103,040
		Interests	Value
Milestone Interests^(a)^,(b)^,(c)—1.8%
Biotechnology—0.1%
Amphivena Milestone Interest		1	$ 0
Invetx, Inc. Milestone Interest		1	1,553,813
			1,553,813
Pharmaceuticals—1.7%
Afferent Milestone Interest		1	0
Amolyt Milestone Interest		1	2,552,658
Ethismos Research Milestone Interest		1	0
Neurovance Milestone Interest		1	16,488,109
			19,040,767
Total Milestone Interests			20,594,580
Total Investments (Cost $932,070,999)^(h)—100.2%			1,138,697,620
Liabilities in Excess of Other Assets—(0.2%)			(1,713,988)
Net Assets—100.0%			$1,136,983,632

(a)	Level 3 security. See Note 2(a) of the accompanying Notes to Financial Statements.
(b)	Non-income producing security.
(c)	Restricted security.
(d)	Affiliated issuers in which the Fund holds 5% or more of the voting securities (total market value of $16,573,976).

6	abrdn Healthcare Investors

Portfolio of Investments (unaudited) (concluded)

As of March 31, 2026

(e)	Foreign security.
(f)	A portion of security is pledged as collateral for call options written.
(g)	Registered investment company advised by State Street Investment Management. The rate shown is the 7 day yield as of March 31, 2026.
(h)	See accompanying Notes to Financial Statements for tax unrealized appreciation/(depreciation) of securities.

ADR	American Depositary Receipt
CVR	Contingent Value Right
PLC	Public Limited Company

	Number of Contracts (100 shares each)	Notional Amount ($)	Value ($)
Option Contracts Written—0.0%
Call Options Written—0.0%
GRAIL, Inc. APR26 70 Call	247	(1,729,000)	(7,410)
Total Call Options Written (Premiums received $(48,659))			(7,410)

See accompanying Notes to Financial Statements.

abrdn Healthcare Investors

Statement of Assets and Liabilities (unaudited)

As of March 31, 2026

Assets
Investments in unaffiliated issuers, at value (cost $900,429,777)	$ 1,097,312,485
Investments in affiliated issuers, at value (cost $20,693,604)	16,573,976
Short-term investment, at value (cost $4,216,579)	4,216,579
Milestone interests, at value (cost $6,731,039)	20,594,580
Receivable for investments sold	755,456
Interest and dividends receivable	504,974
Tax reclaim receivable	13,788
Prepaid expenses	110,417
Other assets (Note 2j)	272
Total assets	1,140,082,527
Liabilities
Due to custodian	1,747,496
Investment advisory fees payable (Note 3)	949,671
Investor relations fees payable (Note 3)	43,650
Payable for investments purchased	35,510
Trustee fees payable	34,995
Administration fees payable	11,649
Written options, at value (premiums received $48,659)	7,410
Other accrued expenses	268,514
Total liabilities	3,098,895
Commitments and Contingencies (Notes 8 & 10)

Net Assets	$1,136,983,632
Composition of Net Assets
Common stock (par value $0.010 per share) (Note 5)	$ 571,922
Paid-in capital in excess of par	1,022,601,971
Distributable earnings	113,809,739
Net Assets	$1,136,983,632
Net asset value per share based on 57,192,236 shares issued and outstanding	$19.88

See accompanying Notes to Financial Statements.

8	abrdn Healthcare Investors

Statement of Operations (unaudited)

For the Six-Month Period Ended March 31, 2026

Net Investment Income
Investment Income:
Dividends	$ 2,369,451
Interest and other income	371,601
Total investment income	2,741,052
Expenses:
Investment advisory fee (Note 3)	5,664,801
Legal fees and expenses	98,513
Investor relations fees and expenses (Note 3)	89,106
Reports to shareholders and proxy solicitation	75,519
Independent auditors’ fees and tax expenses	74,820
Trustees' fees and expenses	70,182
Custodian’s fees and expenses	39,745
Transfer agent’s fees and expenses	30,159
Administration fee	23,356
Insurance expense	14,993
Miscellaneous	49,720
Total expenses	6,230,914

Net Investment Loss	(3,489,862)
Net Realized/Unrealized Gain/(Loss):
Net realized gain/(loss) from:
Investments	103,820,790
Written options	2,047,484
Foreign currency transactions	(253)
	105,868,021
Net change in unrealized appreciation/depreciation on:
Investments in unaffiliated issuers	(26,774,932)
Investments in affiliated issuers	4,318,114
Milestone interests	(1,243,191)
Written options	648,918
Foreign currency translation	(3)
	(23,051,094)
Net realized and unrealized gain from investments, milestone interests, written options and foreign currencies	82,816,927
Change in Net Assets Resulting from Operations	$79,327,065

See accompanying Notes to Financial Statements.

abrdn Healthcare Investors

Statements of Changes in Net Assets

	For the Six-Month Period Ended March 31, 2026 (unaudited)	For the Year Ended September 30, 2025
Increase/(Decrease) in Net Assets:
Operations:
Net investment loss	$(3,489,862)	$(3,346,342)
Net realized gain from investments, written options and foreign currency transactions	105,868,021	26,043,115
Net change in unrealized appreciation/depreciation investments, milestone interests, written options and foreign currency translations	(23,051,094)	75,916,508
Net increase in net assets resulting from operations	79,327,065	98,613,281
Distributions to Shareholders From:
Distributable earnings	(67,103,127)	(114,973,477)
Return of capital	–	(4,562,869)
Net decrease in net assets from distributions	(67,103,127)	(119,536,346)
Reinvestment of dividends resulting in the issuance of 1,681,913 and 3,380,431 shares of common stock, respectively	30,930,887	55,155,920
Change in net assets	43,154,825	34,232,855
Net Assets:
Beginning of period	1,093,828,807	1,059,595,952
End of period	$1,136,983,632	$1,093,828,807

Amounts listed as “–” are $0 or round to $0.

See accompanying Notes to Financial Statements.

10	abrdn Healthcare Investors

Financial Highlights

	For the Six-Month Period Ended March 31,	For the Fiscal Years Ended September 30,
	2026 (unaudited)	2025	2024 ^(a)	2023	2022 ^(b)	2021 ^(b)
PER SHARE OPERATING PERFORMANCE:
Net asset value per common share, beginning of period	$19.70	$20.33	$18.84	$19.36	$25.47	$24.04
Net investment loss^(c)	(0.06)	(0.06)	(0.01)	(0.02)	(0.08)	(0.14)
Net realized and unrealized gains/(losses) on investments, written options and foreign currency transactions	1.44	1.67	3.54	1.11	(4.20)	3.63
Total from investment operations applicable to common shareholders	1.38	1.61	3.53	1.09	(4.28)	3.49
Distributions to common shareholders from:
Net investment income	(1.20)	(2.11)	(0.56)	–	(0.11)	(0.61)
Net realized gains	–	(0.04)	(0.89)	(1.61)	(1.72)	(1.45)
Return of capital	–	(0.09)	(0.59)	–	–	–
Total distributions	(1.20)	(2.24)	(2.04)	(1.61)	(1.83)	(2.06)
Net asset value per common share, end of period	$19.88	$19.70	$20.33	$18.84	$19.36	$25.47
Market price, end of period	$17.79	$18.46	$18.62	$15.55	$17.28	$25.57
Total Investment Return Based on^(d):
Market price	2.76%	13.47%	34.58%	(1.24%)	(26.01%)	34.64%
Net asset value	7.66%	10.90%^(e)	21.28%^(e)	6.80%	(16.78%)	15.03%
Ratio to Average Net Assets Applicable to Common Shareholders/Supplementary Data:
Net assets applicable to common shareholders, end of period (000 omitted)	$1,136,984	$1,093,829	$1,059,596	$931,343	$916,565	$1,156,902
Average net assets applicable to common shareholders (000 omitted)	$1,157,042	$977,805	$989,149	$976,134	$1,007,052	$1,143,870
Gross operating expenses	1.08%^(f)	1.11%	1.12%	1.18%	1.19%	1.11%
Net Investment loss	(0.60%)^(f)	(0.34%)	(0.04%)	(0.12%)	(0.36%)	(0.54%)
Portfolio turnover	50%^(g)	71%	44%	43%	41%	69%

(a)	Effective October 27, 2023, abrdn Inc. became the investment adviser of the Fund. Prior to October 27, 2023, the Fund was managed by Tekla Capital Management, LLC. Members of the portfolio management team from Tekla joined abrdn Inc., and continue to manage the Fund.
(b)	Beginning with the year ended September 30, 2023, the Fund’s financial statements were audited by KPMG LLP. Previous years were audited by a different independent registered public accounting firm.
(c)	Based on average shares outstanding.
(d)	Total investment return based on market value is calculated assuming that shares of the Fund’s common stock were purchased at the closing market price as of the beginning of the period, dividends, capital gains and other distributions were reinvested as provided for in the Fund’s dividend reinvestment plan and then sold at the closing market price per share on the last day of the period. The computation does not reflect any sales commission investors may incur in purchasing or selling shares of the Fund. The total investment return based on the net asset value is similarly computed except that the Fund’s net asset value is substituted for the closing market value.
(e)	The total return shown includes the impact of financial statement rounding of the NAV per share and/or financial statement adjustments.
(f)	Annualized. See accompanying Notes to Financial Statements.

abrdn Healthcare Investors

Financial Highlights (concluded)

(g)	Not annualized.

Amounts listed as “–” are $0 or round to $0.

See accompanying Notes to Financial Statements.

12	abrdn Healthcare Investors

Notes to Financial Statements (unaudited)
March 31, 2026

1. Organization

abrdn Healthcare Investors (the "Fund") is a Massachusetts business trust formed on October 31, 1986 and registered under the Investment Company Act of 1940 as a non-diversified closed-end management investment company. The Fund commenced operations on April 22, 1987. The Fund’s investment objective is to seek long-term capital appreciation by investing in equity and related securities (including securities subject to legal or contractual restrictions on resale) of U.S. and foreign companies principally engaged in the healthcare industries ("Healthcare Companies"). In addition, the Fund seeks to provide regular distribution of realized capital gains. The Fund invests primarily in securities of public and private companies that are believed by the Fund’s investment adviser, abrdn Inc. (the "Investment Adviser," the "Adviser" or "Aberdeen") to have significant potential for above-average growth. The Fund may invest up to 20% of its net assets in securities of foreign issuers, expected to be located primarily in Western Europe, Canada and Japan, and securities of U.S. issuers that are traded primarily in foreign markets.

HQH's closed-end structure and investment mandate enable it to invest in venture capital holdings, leveraging its permanent capital base to hold illiquid private healthcare investments through multi-year development cycles. The Fund applies the same disciplined, science-driven evaluation to these private investments as it does to public equities, with the key differentiator being timing, which is a critical driver of returns in early-stage healthcare. Venture capital holdings typically represent approximately 10% of the Fund's net, though this allocation may fluctuate as positions mature, exit, or are newly initiated.

Variability is inherent in venture investing and reflects the realities of early-stage healthcare Development, including evolving clinical data, financing challenges, extended timelines, and the potential for write-downs. These outcomes are characteristic of the asset class. Since its founding in 1992, HQH has invested in pre-public healthcare companies, with its venture program reflecting a long-term, strategically oriented approach characterized by a non-linear trajectory over time. Periods of strong gains from IPOs and acquisitions have been balanced by setbacks and losses among less successful investments. This long-term, diversified approach highlights the value of maintaining a disciplined venture allocation within a permanent capital structure. These investments are designed to generate value over extended time horizons and are best assessed across full market cycles rather than on short-term performance.

2. Summary of Significant Accounting Policies

The Fund is an investment company and accordingly follows the investment company accounting and reporting guidance of the Financial Accounting Standards Board ("FASB") Accounting Standards Codification Topic 946 Financial Services-Investment Companies. The

following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements. The policies conform to generally accepted accounting principles in the United States of America ("U.S. GAAP"). The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of income and expenses for the period. Actual results could differ from those estimates. The accounting records of the Fund are maintained in U.S. Dollars and the U.S. Dollar is used as both the functional and reporting currency.

a. Security Valuation:

The Fund values its securities at fair value, consistent with regulatory requirements. "Fair value" is defined in the Fund's Valuation and Liquidity Procedures as the price that could be received to sell an asset or paid to transfer a liability in an orderly transaction between willing market participants without a compulsion to transact at the measurement date, also referred to as market value. Pursuant to Rule 2a-5 under the 1940 Act, the Board designated Aberdeen as the valuation designee ("Valuation Designee") for the Fund to perform the fair value determinations relating to Fund investments for which market quotations are not readily available or deemed unreliable and the Fund's investments in securities of early and/or later stage financing of privately held companies ("Venture Capital Securities").

In accordance with the authoritative guidance on fair value measurements and disclosures under U.S. GAAP, the Fund discloses the fair value of its investments using a three-level hierarchy that classifies the inputs to valuation techniques used to measure the fair value. The hierarchy assigns Level 1, the highest level, measurements to valuations based upon unadjusted quoted prices in active markets for identical assets, Level 2 measurements to valuations based upon other significant observable inputs, including adjusted quoted prices in active markets for similar assets, and Level 3, the lowest level, measurements to valuations based upon unobservable inputs that are significant to the valuation. Inputs refer broadly to the assumptions that market participants would use in pricing the asset or liability, including assumptions about risk, for example, the risk inherent in a particular valuation technique used to measure fair value including a pricing model and/or the risk inherent in the inputs to the valuation technique. Inputs may be observable or unobservable. Observable inputs are inputs that reflect the assumptions market participants would use in pricing the asset or liability, which are based on market data obtained from sources independent of the reporting entity. Unobservable inputs are inputs that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. A financial instrument’s level within the

abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

fair value hierarchy is based upon the lowest level of any input that is significant to the fair value measurement.

Open-end mutual funds are valued at the respective NAV as reported by such company. The prospectuses for the registered open-end management investment companies in which the Fund invests explain the circumstances under which those companies will use fair value pricing and the effects of using fair value pricing. Closed-end funds and exchange-traded funds ("ETFs") are valued at the market price of the security at the Valuation Time (defined below). A security using any of these pricing methodologies is generally determined to be a Level 1 investment.

Long-term debt and other fixed-income securities are valued at the last quoted or evaluated bid price on the valuation date provided by an independent pricing service provider. If there are no current day bids, the security is valued at the previously applied bid. Pricing services generally price debt securities assuming orderly transactions of an institutional “round lot” size and the strategies employed by the Valuation Designee generally trade in round lot sizes. In certain circumstances, some trades may occur in smaller “odd lot” sizes which may be effected at lower, or higher, prices than institutional round lot trades. Short-term debt securities (such as commercial paper and U.S. treasury bills) having a remaining maturity of 60 days or less are valued at the last quoted or evaluated bid price on the valuation date provided by an independent pricing service, or on the basis of amortized cost, if it represents the best approximation of fair value. Debt and other fixed-income securities are generally determined to be Level 2 investments.

Equity securities that are traded on an exchange are valued at the last quoted sale price or the official close price on the principal exchange on which the security is traded at the “Valuation Time” subject to application, when appropriate, of the valuation factors described in the paragraph below. Under normal circumstances, the Valuation Time is as of the close of regular trading on the New York Stock Exchange ("NYSE") (usually 4:00 p.m. Eastern Time). In the absence of a sale price, the security is valued at the mean of the bid/ask price quoted at the close on the principal exchange on which the security is traded. Securities traded on NASDAQ are valued at the NASDAQ official closing price.

Convertible preferred shares, warrants or convertible note interests in Venture Capital Securities, milestone interests, and other restricted securities are typically valued in good faith, based upon the recommendations made by the Valuation Designee pursuant to fair valuation policies and procedures approved by the Board.

Derivative instruments are valued at fair value. Exchange-traded futures are generally Level 1 investments and centrally cleared swaps and forwards are generally Level 2 investments. Forward foreign currency contracts are generally valued based on the bid price of the

forward rates and the current spot rate. Forward exchange rate quotations are available for scheduled settlement dates, such as 1-, 3-, 6-, 9- and 12-month periods. An interpolated valuation is derived based on the actual settlement dates of the forward contracts held. Futures contracts are valued at the settlement price or at the last bid price if no settlement price is available. Swap agreements are generally valued by an approved pricing agent based on the terms of the swap agreement (including future cash flows). When market quotations or exchange rates are not readily available, or if the Adviser concludes that such market quotations do not accurately reflect fair value, the fair value of the Fund’s assets are determined in good faith in accordance with the Valuation Procedures.

Foreign equity securities that are traded on foreign exchanges that close prior to the Valuation Time are valued by applying valuation factors to the last sale price or the mean price as noted above. Valuation factors are provided by an independent pricing service provider. These valuation factors are used when pricing the Fund's portfolio holdings to estimate market movements between the time foreign markets close and the time the Fund values such foreign securities. These valuation factors are based on inputs such as depositary receipts, indices, futures, sector indices/ETFs, exchange rates, and local exchange opening and closing prices of each security. When prices with the application of valuation factors are utilized, the value assigned to the foreign securities may not be the same as quoted or published prices of the securities on their primary markets. A security that applies a valuation factor is generally determined to be a Level 2 investment because the exchange-traded price has been adjusted. Valuation factors are not utilized if the independent pricing service provider is unable to provide a valuation factor or if the valuation factor falls below a predetermined threshold; in such case, the security is determined to be a Level 1 investment.

Short-term investments are comprised of cash and cash equivalents invested in short-term investment funds which are redeemable daily. The Fund sweeps available cash into the State Street Institutional U.S. Government Money Market Fund, which has elected to qualify as a “government money market fund” pursuant to Rule 2a-7 under the 1940 Act, and has an objective, which is not guaranteed, to maintain a $1.00 per share NAV. Generally, these investment types are categorized as Level 1 investments.

In the event that a security’s, other than a Venture Capital Security, market quotations are not readily available or are deemed unreliable (for reasons other than because the foreign exchange on which it trades closes before the Valuation Time), the security is valued at fair value as determined by the Valuation Designee, taking into account the relevant factors and surrounding circumstances using valuation policies and procedures approved by the Board. A security that has been fair valued by the Valuation Designee may be classified as Level 2 or Level 3 depending on the nature of the inputs.

14	abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

Venture Capital Securities are valued based on a consideration of relevant factors, including both observable and unobservable inputs. Observable and unobservable inputs considered may include (i) the existence of any contractual restrictions on the disposition of securities; (ii) information obtained from the company, which may include an analysis of the company's financial statements, products, intended markets or technologies; (iii) the price of the same or similar security negotiated at arm's length in an issuer's completed subsequent round of financing; (iv) the price and extent of public trading in similar securities of the issuer or of comparable companies; or (v) a probability and time value adjusted analysis of contractual terms. Where available and appropriate, multiple valuation methodologies are applied to confirm fair value. Significant unobservable inputs are often used in the fair value determination. A significant change in any of these inputs may result in a significant change in the fair value measurement. Additionally, changes in the market environment and other events that may occur over the life of the investments may cause the gains or losses ultimately realized on these investments to be different from the valuations used at the date of these financial statements.

The three-level hierarchy of inputs is summarized below:

Level 1 - quoted prices (unadjusted) in active markets for identical investments;

Level 2 - other significant observable inputs (including valuation factors, quoted prices for similar securities, interest rates, prepayment speeds, and credit risk, etc.); or

Level 3 - significant unobservable inputs (including the Fund’s own assumptions in determining the fair value of investments).

Level 3 investments are valued using significant unobservable inputs. The unobservable inputs disclosed represent the inputs that had the most significant impact on the determination of fair value and reflect management’s assessment of the key assumptions used in the valuation of the security. These inputs were selected after consideration of a range of available information relevant to the issuer and the security, including information obtained from the issuer (such as analysis of financial statements, products, intended markets, or technologies), and other factors deemed relevant to the valuation. The derived value of a Level 3 investment may not represent the value which is received upon disposition and this could impact the results of operations.

The following is a summary of the inputs used as of March 31, 2026 in valuing the Fund's investments and other financial instruments at fair value. The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities. Please refer to the Portfolio of Investments for a detailed breakout of the security types:

Investments, at Value	Level 1 – Quoted Prices	Level 2 – Other Significant Observable Inputs	Level 3 – Significant Unobservable Inputs	Total
Assets
Investments in Securities
Common Stocks	$1,001,496,019	$–	$39,870	$1,001,535,889
Convertible Preferred Stocks	–	–	83,028,646	83,028,646
Warrants	–	15,645,126	8,103,345	23,748,471
Milestone Interests	–	–	20,594,580	20,594,580
Convertible Notes	–	–	5,573,455	5,573,455
Short-Term Investment	4,216,579	–	–	4,216,579
Total Investments	$1,005,712,598	$15,645,126	$117,339,896	$1,138,697,620
Other Assets	$–	$–	$272	$272
Total Investment Assets	$1,005,712,598	$15,645,126	$117,340,168	$1,138,697,892
Liabilities
Other Financial Instruments
Written Options	$(7,410)	$–	$–	$(7,410)
Total Investment Liabilities	$(7,410)	$–	$–	$(7,410)

abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

Rollforward of Level 3 Fair Value Measurements For the Six Months Ended March 31, 2026
Investments in Securities	Balance as of September 30, 2025	Net Realized Gain (Loss) and Change in Unrealized Appreciation/ Depreciation	Net Purchases and conversions	Net Sales and conversions	Balance as of March 31, 2026	Net Change in Unrealized Appreciation/ Depreciation from Investments Held at March 31, 2026
Common Stocks
Biotechnology	$29,376	$–	$–	$–	$29,376	$–
Health Care Equipment & Supplies	16	–	–	–	16	–
Pharmaceuticals	10,478	–	–	–	10,478	6,383
Convertible Notes
Biotechnology	2,837,472	–	–	–	2,837,472	–
Health Care Providers & Services	161,371	–	–	–	161,371	–
Pharmaceuticals	1,468,197	–	1,106,415	–	2,574,612	–
Convertible Preferred Stocks
Biotechnology	43,672,521	(5,629,429)	1,197,870	(407,845)	38,833,117	5,218,651
Health Care Equipment & Supplies	42	–	–	–	42	–
Pharmaceuticals	30,666,244	10,313,728	3,215,515	–	44,195,487	10,313,728
Milestone Interests
Biotechnology	3,243,635	(1,689,822)	–	–	1,553,813	(1,689,822)
Pharmaceuticals	18,594,136	446,631	–	–	19,040,767	446,631
Warrants
Biotechnology	2,407,999	5,695,339	–	–	8,103,338	5,695,339
Health Care Providers & Services	–	–	–	–	–	–
Pharmaceuticals	7	–	–	–	7	–
Other Assets	272	–	–	–	272	–
Total	$103,091,766	$9,136,447	$5,519,800	$(407,845)	$117,340,168	$19,990,910

Description	Fair Value at March 31, 2026	Valuation Technique (s)	Unobservable Inputs	Range	Weighted Average	Relationship Between Fair Value and Input; if Input value increases then Fair Value:
Common Stocks	$16	Market approach	Transaction Price^(a)	N/A	N/A	Increases
	$39,854	Income approach	Probability of events Timing of events	16.00% - 46.00% 3.41 - 3.75 years	23.89% 3.66 years	Increases Decreases
Convertible Notes	$5,573,455	Market approach	Transaction Price^(b)	N/A	N/A	Increases
Convertible Preferred Stocks	$1,853,022	Market approach	Timing of events Implied market volatility Risk free rate Transaction Price^(a)	0.24 years 116.74% 3.67% N/A	0.24 years 116.74% 3.67% N/A	Decreases Decreases Decreases Increases
	$81,175,624	Market approach	Transaction Price^(a)	N/A	N/A	Increases

16	abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

Description	Fair Value at March 31, 2026	Valuation Technique (s)	Unobservable Inputs	Range	Weighted Average	Relationship Between Fair Value and Input; if Input value increases then Fair Value:
Milestone Interests	$20,594,580	Income approach	Discount rate Probability of events Timing of events	3.40 - 10.00%% 0.00% - 90.00% 0.00 - 8.00 years	4.01% 56.00% 2.76 years	Decreases Increases Decreases
Warrants	$7	Market approach	Transaction Price^(a)	N/A	N/A	Increases
	$8,103,338	Income Approach	Discount Rate Implied market volatility Timing of events Marketability Discount	3.65% - 3.94% 90.00% 0.84 - 4.18 years 30.00%	3.81% 90.00% 2.41 years 30.00%	Decreases Decreases Decreases Decreases
Other Assets	$272	Income approach	Discount rate Probability of events Timing of events	4.04% 5.00% 6.25 years	4.04% 5.00% 6.25 years	Decreases Increases Decreases
Total	$117,340,168

Amounts listed as “–” are $0 or round to $0.

(a)

The valuation technique used as a basis to approximate fair value of these investments is based on a transaction price or subsequent financing rounds.

(b)

The valuation technique used to approximate fair value is based primarily on the transaction price at origination or subsequent arm’s-length financing rounds, considered from a market participant perspective. The analysis incorporates both issuer-level and instrument-specific factors. As of the measurement date, the valuation designee has assessed whether any internal or external developments would indicate that the transaction price is no longer representative of fair value, including changes in credit risk, repayment expectations, or expected cash flows, and has not identified any such indicators. Accordingly, no adjustments to the transaction price were deemed necessary, and the venture debt instruments continue to be valued at par.

The Fund may incur certain costs in connection with the disposition of the above securities.

Weighted averages for unobservable inputs, including timing of cash flows, discount rates, and probabilities of achievement, are calculated by weighting each input based on the relative fair value of the associated projected cash flows or milestones. Accordingly, the weighted averages reflect the relative significance of each input to the overall fair value measurement, rather than a simple arithmetic average. Significant changes in these unobservable inputs, individually or in combination, could result in a significantly higher or lower fair value measurement.

b. Restricted Securities:

Restricted securities are privately-placed securities whose resale is restricted under U.S. securities laws. The Fund may invest in restricted securities, including unregistered securities eligible for resale without registration pursuant to Rule 144A and privately-placed securities of U.S. and non-U.S. issuers offered outside the U.S. without registration pursuant to Regulation S under the Securities Act of 1933, as amended (the "1933 Act"). Rule 144A securities may be freely traded among certain qualified institutional investors, such as the Fund, but resale of such securities in the U.S. is permitted only in limited circumstances.

c. Foreign Currency Translation:

Foreign securities, currencies, and other assets and liabilities denominated in foreign currencies are translated into U.S. Dollars at

the exchange rate of said currencies against the U.S. Dollar, as of the Valuation Time, as provided by an independent pricing service approved by the Board.

Foreign currency amounts are translated into U.S. Dollars on the following basis:

(i) fair value of investment securities, other assets and liabilities – at the current daily rates of exchange at the Valuation Time; and

(ii) purchases and sales of investment securities, income and expenses – at the relevant rates of exchange prevailing on the respective dates of such transactions.

abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

The Fund does not isolate that portion of gains and losses on investments in equity securities due to changes in the foreign exchange rates from the portion due to changes in market prices of equity securities. Accordingly, realized and unrealized foreign currency gains and losses with respect to such securities are included in the reported net realized and unrealized gains and losses on investment transactions balances.

Net unrealized currency gains or losses from valuing foreign currency denominated assets and liabilities at period end exchange rates are reflected as a component of net unrealized appreciation/depreciation in value of investments, and translation of other assets and liabilities denominated in foreign currencies.

Net realized foreign exchange gains or losses represent foreign exchange gains and losses from transactions in foreign currencies and forward foreign currency contracts, exchange gains or losses realized between the trade date and settlement date on security transactions, and the difference between the amounts of interest and dividends recorded on the Fund’s books and the U.S. Dollar equivalent of the amounts actually received.

Foreign security and currency transactions may involve certain considerations and risks not typically associated with those of domestic origin, including unanticipated movements in the value of the foreign currency relative to the U.S. Dollar. Generally, when the U.S. Dollar rises in value against foreign currency, the Fund's investments denominated in that foreign currency will lose value because the foreign currency is worth fewer U.S. Dollars; the opposite effect occurs if the U.S. Dollar falls in relative value.

d. Rights Issues and Warrants:

Rights issues give the right, normally to existing shareholders, to buy a proportional number of additional securities at a given price (generally at a discount) within a fixed period (generally a short-term period) and are offered at the company’s discretion. Warrants are securities that give the holder the right to buy common stock at a specified price for a specified period of time. Rights issues and warrants are speculative and have no value if they are not exercised before the expiration date. Rights issues and warrants are valued at the last sale price on the exchange on which they are traded.

e. Options:

An option contract is a contract in which the writer (seller) of the option grants the buyer of the option, upon payment of a premium, the right to purchase from (call option) or sell to (put option) the writer a designated instrument at a specified price within a specified period of time. Certain options, including options on indices, will require cash settlement by the Fund if the option is exercised.

The Fund’s obligation under an exchange traded written option or investment in an exchange traded purchased option is valued at the last sale price, or in the absence of a sale, the mean between the closing bid and asked prices. Gain or loss is recognized when the option contract expires, is exercised or is closed.

If the Fund writes a covered call option, the Fund foregoes, in exchange for the premium, the opportunity to profit during the option period from an increase in the market value of the underlying security above the exercise price. If the Fund writes a put option it accepts the risk of a decline in the market value of the underlying security below the exercise price. Over-the-counter options have the risk of the potential inability of counterparties to meet the terms of their contracts. The Fund’s maximum exposure to purchased options is limited to the premium initially paid. In addition, certain risks may arise upon entering into option contracts including the risk that an illiquid secondary market will limit the Fund’s ability to close out an option contract prior to the expiration date and that a change in the value of the option contract may not correlate exactly with changes in the value of the securities or currencies hedged.

All options on securities and securities indices written by the Fund are required to be covered. When the Fund writes a call option, this means that during the life of the option the Fund may own or have the contractual right to acquire the securities subject to the option or may maintain with the Fund’s custodian in a segregated account appropriate liquid securities in an amount at least equal to the market value of the securities underlying the option. When the Fund writes a put option, this means that the Fund will maintain with the Fund’s custodian in a segregated account appropriate liquid securities in an amount at least equal to the exercise price of the option.

18	abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

Summary of Derivative Instruments:

The Fund may use derivatives for various purposes as noted above. The following is a summary of the fair value of derivative instruments, not accounted for as hedging instruments, as of March 31, 2026:

	Risk Exposure Category
	Equity Contracts	Total

Liabilities:
Unrealized depreciation on:
Written Options, fair value	$7,410	$7,410
Total	$7,410	$7,410

The effect of derivative instruments on the Statement of Operations for the six-month period ended March 31, 2026:

	Risk Exposure Category
	Equity Contracts	Total

Realized Gain/(Loss) on Derivatives Recognized as a Result of Operations:
Written Options	$2,047,484	$2,047,484
Total	$2,047,484	$2,047,484
Net Change in Unrealized Appreciation/Depreciation on Derivatives Recognized as a Result of Operations:
Written Options	$648,918	$648,918
Total	$648,918	$648,918

Information about derivatives reflected as of the date of this report is generally indicative of the type of activity for the six-month period ended March 31, 2026. The table below summarizes the weighted average values of derivatives holdings for the Fund during the six-month period ended March 31, 2026.

Derivative	Average Monthly Notional Value
Written Options Contracts	$260,546

f. Security Transactions, Investment Income and Expenses:

Security transactions are recorded on the trade date. Realized gains/(losses) from security and currency transactions are calculated on the identified cost basis. Dividend income and corporate actions are recorded generally on the ex-date, except for certain dividends and corporate actions which may be recorded after the ex-date, as soon as the Fund acquires information regarding such dividends or corporate actions. Interest income and expenses are recorded on an accrual basis.

g. Distributions:

The Fund has a managed distribution policy to pay distributions from net investment income supplemented by net realized capital gains and return of capital distributions, if necessary, on a quarterly basis. The

managed distribution policy is subject to regular review by the Board. The Fund will also declare and pay distributions at least annually from net realized gains on investment transactions and net realized foreign exchange gains, if any. Dividends and distributions to shareholders are recorded on the ex-dividend date. Dividends and distributions to shareholders are determined in accordance with federal income tax regulations, which may differ from U.S. GAAP.

h. Federal Income Taxes:

The Fund intends to continue to qualify as a “regulated investment company” ("RIC") by complying with the provisions available to certain investment companies, as defined in Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"), and to make distributions of net investment income and net realized capital gains sufficient to relieve the Fund from all federal income taxes. Therefore, no federal income tax provision is required.

The Fund recognizes the tax benefits of uncertain tax positions only where the position is “more likely than not” to be sustained assuming examination by tax authorities. Management of the Fund has concluded that there are no significant uncertain tax positions that would require recognition in the financial statements. Since tax authorities can examine previously filed tax returns, the Fund's U.S.

abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

federal and state tax returns for each of the most recent four fiscal years up to the most recent fiscal year ended September 30, 2025 are subject to such review.

i. Milestone Interests

The Fund holds financial instruments which reflect the current value of future milestone payments the Fund may receive as a result of contractual obligations from other parties. The value of such payments are adjusted to reflect the estimated risk based on the relative uncertainty of both the timing and the achievement of individual milestones. A risk to the Fund is that the milestones will not be achieved and no payment will be received by the Fund. The milestone interests were received as part of the proceeds from the sale of six private companies. Any payments received are treated as a reduction of the cost basis of the milestone interests with payments received in excess of the cost basis treated as a realized gain. The contractual obligations with respect to the milestone interests provide for payments at various stages of the development of Afferent, Amolyt, Amphivena, Ethismos Research, Invetx and Neurovance principal product candidate as of the date of the sale.

The following is a summary of the impact of the milestone interests on the financial statements as of and for the six-month period ended March 31, 2026:

Statement of Assets and Liabilities, Milestone interests, at value	$20,594,580
Statement of Assets and Liabilities, Total distributable earnings	$13,863,541
Statement of Operations, Change in unrealized appreciation/depreciation	$(1,243,191)

j. Other Assets

Other assets in the Statement of Assets and Liabilities consists of amounts due to the Fund at various times in the future in connection with the sale of investments in one private company.

3. Agreements and Transactions with Affiliates

a. Investment Adviser and Other Affiliated Fees

Aberdeen serves as the Fund’s Investment Adviser pursuant to an investment advisory agreement (the “Advisory Agreement”) with the Fund. Aberdeen also provides administration services under the same agreement. The Adviser is a wholly-owned indirect subsidiary of Aberdeen Group plc. In rendering management services, the Adviser may use the resources of investment adviser subsidiaries of Aberdeen Group plc. These affiliates have entered into procedures pursuant to which investment professionals from affiliates may render portfolio management and research services as associated persons of the Adviser. As compensation for its services to the Fund, the Investment Adviser receives an annual investment advisory fee, computed and paid monthly, at an annual rate of (i) 2.50% of the average net assets

for the month of its venture capital and other restricted securities up to 25% of net assets and (ii) for all other net assets, 0.98% of the average net assets up to $250 million, 0.88% of the average net assets for the next $250 million, 0.80% of the average net assets for the next $500 million and 0.70% of the average net assets thereafter. Based on the Portfolio of Investments as of March 31, 2026 the aggregate fee would not exceed a rate when annualized of 1.36%. For the six-month period ended March 31, 2026, the Fund paid the Adviser $5,664,801.

Effective upon the close of business on October 27, 2023, the Adviser entered into a written contract with the Fund to limit the total ordinary operating expenses of the Fund (excluding leverage costs, interest, taxes, brokerage commissions, acquired fund fees and expenses and any non-routine expenses) from exceeding 1.17% of the average daily net assets of the Fund on an annualized basis for two years (the “Expense Limitation Agreement”). The Expense Limitation Agreement terminated on October 27, 2025. For the six-month period ended March 31, 2026 the Adviser did not waive any Fund's expenses pursuant to the Expense Limitation Agreement.

b. Investor Relations:

Effective March 1, 2024, under the terms of the Investor Relations Services Agreement, Aberdeen is compensated to provide and may pay third parties to provide investor relations services to the Fund and certain other funds advised by Aberdeen or its affiliates as part of an Investor Relations Program. Under the Investor Relations Services Agreement, the Fund owes a portion of the fees related to the Investor Relations Program (the "Fund's Portion"). However, investor relations services fees are limited by Aberdeen so that the Fund will only pay up to an annual rate of 0.05% of the Fund's average weekly net assets. Any difference between the capped rate of 0.05% of the Fund's average weekly net assets and the Fund's Portion is paid for by Aberdeen.

Pursuant to the terms of the Investor Relations Services Agreement, Aberdeen (or third parties engaged by Aberdeen), among other things, provides objective and timely information to shareholders based on publicly-available information; provides information efficiently through the use of technology while offering shareholders immediate access to knowledgeable investor relations representatives; develops and maintains effective communications with investment professionals from a wide variety of firms; creates and maintains investor relations communication materials such as fund manager interviews, films and webcasts, publishes white papers, magazine articles and other relevant materials discussing the Fund's investment results, portfolio positioning and outlook; develops and maintains effective communications with large institutional shareholders; responds to specific shareholder questions; and reports activities and results to the Board and management detailing insight into general shareholder sentiment.

20	abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

During the six-month period ended March 31, 2026, the Fund incurred investor relations fees of approximately $89,106. For the six-month period ended March 31, 2026, Aberdeen did not contribute to the investor relations fees for the Fund because the Fund’s contribution was below 0.05% of the Fund’s average weekly net assets on an annual basis.

4. Investment Transactions

Purchases and sales of investment securities (excluding short-term securities) for the six-month period ended March 31, 2026, were $573,475,871 and $598,861,370, respectively.

5. Capital

The Fund is authorized to issue an unlimited number of common shares of beneficial interest at par value $0.01 per common share. As of March 31, 2026, there were 57,192,236 shares of common stock issued and outstanding.

The following table shows the shares issued by the Fund as a part of a quarterly distribution to shareholders during the fiscal year ended March 31, 2026.

Payment Date	Shares Issued
January 12, 2026	778,952
March 31, 2026	902,961

6. Other Transactions with Affiliates

An affiliate company is a company in which the Fund holds 5% or more of the voting securities. Transactions involving such companies during the six-month period ended March 31, 2026 were as follows:

	Value at September 30, 2025	Cost of Purchases	Proceeds from Shares Sold	Realized Gain (Loss)	Change in Unrealized Appreciation/ Depreciation	Value at March 31, 2026	Shares held at March 31, 2026	Principal Amount at March 31, 2026	Dividend Income	Capital Gains Distributions
Curasen Therapeutics, Inc.	$12,697,521	$2,738	$–	$–	$(2,738)	$12,697,521	24,334,361	$1,029,195	$–	$–
Priothera Co. Ltd.	41	12,113	–	–	(12,114)	40	346,666	–	–	–
Qlaris Bio, Inc.	3,450,000	427,916	–	–	(1,501)	3,876,415	4,394,904	426,415	–	–
Total	$16,147,562	$442,767	$0	$0	$(16,353)	$16,573,976	29,075,931	$1,455,610	$0	$0

Amounts listed as “–” are $0 or round to $0.

7. Open Market Repurchase Program

historical discount levels and current market conditions. If shares are repurchased, the Fund reports repurchase activity on its website on a monthly basis. For the six-month period ended March 31, 2026, the Fund did not repurchase any shares through the Program.

On a quarterly basis, the Board will receive information on any transactions made pursuant to this policy during the prior quarter.

8. Private Companies and Other Restricted Securities

The Fund may invest in private companies and other restricted securities if these securities currently comprise 40% or less of net assets. The value of these securities represented 8.22% of the Fund’s net assets at March 31, 2026.

The following table details the acquisition date, cost, carrying value per unit, and value of the Fund’s private companies and other restricted securities at March 31, 2026. The Fund on its own does not have the right to demand that such securities be registered.

abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

Security	Acquisition Date	Unfunded Commitment	Cost	Carrying Value per Unit	Fair Value as of March 31, 2026
Abcuro, Inc., Series B — Convertible Preferred Stock	12/19/23, 8/10/23	$0	$2,931,178	$5.49	$2,925,000
Abcuro, Inc., Series C1 — Convertible Preferred Stock	2/7/25	0	713,377	6.04	712,120
Afferent Milestone Interest	7/27/16	0	57,299	0.00	0
Amolyt Milestone Interest	7/12/24	0	1,598,208	159.72	2,552,658
Amphivena Milestone Interest	10/18/22	0	0	0.00	0
Arbor Biotechnologies, Inc., Series B — Convertible Preferred Stock	10/29/21	0	1,367,906	16.57	1,359,999
Arbor Biotechnologies, Inc., Series C — Convertible Preferred Stock	9/27/24	0	3,408,611	4.11	3,399,998
Atalanta Therapeutics, Inc., Series B — Convertible Preferred Stock	10/11/24	1,600,000	3,201,518	0.90	1,600,000
Aviceda Therapeutics, Series C — Convertible Preferred Stock	12/17/24	881,210	511,135	5.76	498,793
Biotheryx, Inc., Series E — Convertible Preferred Stock	5/19/21	0	6,814,111	0.51	654,484
Chinook Therapeutics, Inc. CVR — Common Stock	8/14/23	0	0	0.32	29,376
Crystalys Therapeutics, Inc., Series A — Convertible Preferred Stock	6/23/25	1,555,199	2,334,975	1.00	2,332,800
Curasen Therapeutics, Inc., Series B — Convertible Preferred Stock	8/20/24, 1/7/25	0	1,547,714	0.48	1,543,792
Curasen Therapeutics, Inc., Series A — Convertible Preferred Stock	8/20/24	0	10,170,371	0.48	10,124,534
Curasen Therapeutics, Inc. — Convertible Note		0	1,029,195	100.00	1,029,195
Endeavor Group Holdings, Inc., Series B — Convertible Preferred Stock	1/21/22	0	3,106,638	4.72	3,099,996
Endeavor Group Holdings, Inc., Series C — Convertible Preferred Stock	4/19/24	0	792,452	6.52	791,936
Engrail Therapeutics, Inc. — Convertible Preferred Stock	3/14/24	0	5,053,176	0.60	2,842,592
Ethismos Research Milestone Interest	10/31/17	0	0	0.00	0
Fusion Pharmaceuticals, Inc. CVR — Common Stock	7/10/24	0	4,176	1.38	10,478
Glycomine, Inc., Series C — Convertible Preferred Stock	7/22/24, 3/26/25	0	3,955,459	0.60	3,950,904
HiberCell, Inc., Series C — Convertible Preferred Stock	5/5/21	0	711,659	0.46	708,965
HiberCell, Inc., Series B — Convertible Preferred Stock	5/5/21	0	3,417,983	0.41	1,144,057
HiberCell, Inc. — Warrant, expiration date 9/15/28	9/20/22	0	2,749	0.00	2
HiberCell, Inc. — Convertible Note	9/13/24	0	439,002	100.00	439,002
HiberCell, Inc. — Warrant, expiration date 9/13/34	9/13/24	0	0	0.00	5
HiberCell, Inc. — Convertible Note	1/9/26	0	680,000	100.00	680,000
HiberCell, Inc. — Warrant, expiration date 1/9/36	1/9/26	0	0	0.00	0
Hotspot Therapeutics, Inc., Series C — Convertible Preferred Stock	11/15/21	0	2,055,041	3.24	2,049,526
Hotspot Therapeutics, Inc., Series B — Convertible Preferred Stock	4/22/20, 6/17/21	0	6,925,074	2.40	6,900,000
Hotspot Therapeutics, Inc. — Convertible Note	4/12/24	0	720,872	100.00	720,872
Incendia Therapeutics, Inc., Series A — Convertible Preferred Stock	8/12/21	0	3,418,315	0.36	641,755
Incendia Therapeutics, Inc. — Convertible Note	4/18/24	0	1,569,230	100.00	1,569,230
Incendia Therapeutics, Inc. — Convertible Note	9/9/25	0	547,370	100.00	547,370
Invetx, Inc. Milestone Interest	9/4/24	0	2,908,820	49.81	1,553,813
IO Light Holdings, Inc., Series A2 — Convertible Preferred Stock	4/30/20, 5/17/21, 9/15/21	0	1,395,847	0.00	42

22	abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

Security	Acquisition Date	Unfunded Commitment	Cost	Carrying Value per Unit	Fair Value as of March 31, 2026
Neurovance Milestone Interest	3/20/17	$0	$2,166,711	$336.45	$16,488,109
Nuvig Therapeutics, Inc., Series B — Convertible Preferred Stock	10/18/24	1,725,000	1,731,484	1.05	1,724,998
Priothera Co. Ltd., Series A — Convertible Preferred Stock	10/7/20	618,663	4,064,570	0.00	40
Qlaris Bio, Inc., Series B — Convertible Preferred Stock	4/11/24	0	3,455,339	0.79	3,450,000
Qlaris Bio, Inc. — Convertible Note		0	426,415	100.00	426,415
Quell Therapeutics Ltd., Series B — Convertible Preferred Stock	11/29/21, 03/23/22, 2/18/25	0	3,420,830	2.08	3,739,998
Recode Therapeutics, Inc., Series B — Convertible Preferred Stock	1/26/24, 10/12/21, 2/16/22	0	3,083,926	9.23	3,060,003
Recode Therapeutics, Inc. — Convertible Note	9/23/25	0	161,370	100.00	161,371
Recode Therapeutics, Inc. — Warrant, expiration date 9/23/35	9/23/26	0	0	0.00	0
Seismic Therapeutics, Inc., Series B — Convertible Preferred Stock	8/30/24	0	2,931,369	4.52	2,924,983
Third Arc Bio, Inc., Series A — Convertible Preferred Stock	7/15/24, 4/24/25	0	5,080,964	2.10	5,069,998
VeraDermics, Inc., Series C — Convertible Preferred Stock	10/14/25	0	3,207,499	63.15	15,777,333
Willow Laboratories, Inc. — Common Stock	3/31/98	0	0	0.00	16
Total		$6,380,072	$103,119,938		$109,236,558

9. Portfolio Investment Risks

a. Concentration Risk:

The Fund’s portfolio may be more sensitive to, and possibly more adversely affected by, regulatory, economic or political factors or trends relating to the healthcare industries than a portfolio of companies representing a larger number of industries. This risk is in addition to the risks normally associated with any strategy seeking capital appreciation by investing in a portfolio of equity securities. As a result of its concentration policy, the Fund’s investments may be subject to greater risk than a fund that has securities representing a broader range of investments and may cause the value of the Fund’s shares to fluctuate significantly over relatively short periods of time.

b. Derivatives Risk (including Options):

Derivatives are speculative and may hurt the Fund’s performance. The potential benefits to be derived from the Fund’s options strategy are dependent upon the portfolio managers’ ability to discern pricing inefficiencies and predict trends in these markets, which decisions could prove to be inaccurate.

c. Equity Securities Risk:

The stock or other security of a company may not perform as well as expected, and may decrease in value, because of factors related to the company (such as poorer than expected earnings or certain management decisions), to the industry in which the company is

engaged (such as a reduction in the demand for products or services in a particular industry) or to the market as a whole (such as periods of market volatility or instability, or general and prolonged periods of economic decline). Holders of common stock generally are subject to more risks than holders of preferred stock or debt securities because the right to repayment of common shareholders' claims is subordinated to that of preferred stock and debt securities upon the bankruptcy of the issuer.

d. Key Personnel Risk:

There may be only a limited number of securities professionals who have comparable experience to that of the Fund’s existing portfolio management team in the area of healthcare companies. If one or more of the team members dies, resigns, retires or is otherwise unable to act on behalf of the Investment Adviser, there can be no assurance that a suitable replacement could be found immediately.

e. Restricted Securities and Valuation Risk:

Some of the Fund’s investments are subject to restrictions on resale and generally have no established trading market or are otherwise illiquid with little or no trading activity. The valuation process requires an analysis of various factors. The Fund’s fair value methodology includes the examination of, among other things, (i) the existence of

abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

any contractual restrictions on the disposition of the securities; (ii) information obtained from the issuer which may include an analysis of the company’s financial statements, the company’s products or intended markets, or the company’s technologies; and (iii) the price of a security sold at arm’s length in an issuer’s subsequent completed round of financing. As there is typically no readily available market value for some of the Restricted Securities in the Fund’s portfolio, such Restricted Securities in the Fund’s portfolio are valued at fair value as determined in good faith by the Valuation Designee pursuant to the Fund’s valuation policy and a consistently applied valuation process. Because of the inherent uncertainty of determining the fair value of investments that do not have a readily available market value, the fair value of the Fund’s investments determined in good faith by the Valuation Designee may differ significantly from the values that would have been used had a ready market existed for the investments, and the differences could be material.

f. Risks Associated with the Fund’s Option Strategy:

The ability of the Fund to achieve its investment objective is partially dependent on the successful implementation of its option strategy. There are several risks associated with transactions in options on securities used in connection with the Fund's option strategy. For example, there are significant differences between the securities and options markets that could result in an imperfect correlation between these markets, causing a given transaction not to achieve its objectives. A decision as to whether, when and how to use options involves the exercise of skill and judgment, and even a well-conceived transaction may be unsuccessful to some degree because of market behavior or unexpected events.

As the writer of a call option covered with a security held by the Fund, the Fund forgoes, during the option's life, the opportunities to profit from increases in the market value of the security covering the call option above the sum of the premium and the strike price of the call but retains the risk of loss should the price of the underlying security decline. As the Fund writes such covered calls over more of its portfolio, its ability to benefit from capital appreciation becomes more limited. To the extent the Fund writes call options that are not fully covered by securities in its portfolio (such as calls on an index or sector), it will lose money if the portion of the security or securities underlying the option that is not covered by securities in the Fund's portfolio appreciate in value above the exercise price of the option by an amount that exceeds the premium received on the option plus the exercise price of the option. The amount of this loss theoretically could be unlimited. The writer of an option has no control over the time when it may be required to fulfill its obligations as a writer of the option.

When the Fund writes put options, it bears the risk of loss if the value of the underlying stock declines below the exercise price minus the put

premium. If the option is exercised, the Fund could incur a loss if it is required to purchase the stock underlying the put option at a price greater than the market price of the stock at the time of exercise plus the put premium the Fund received when it wrote the option. While the Fund's potential gain as the writer of a covered put option is limited to the premium received from the purchaser of the put option, the Fund risks a loss equal to the entire exercise price of the option minus the put premium.

g. Sector Risk:

To the extent that the Fund has a significant portion of its assets invested in securities conducting business in a broadly related group of industries within an economic sector, the Fund may be more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly.

Biotechnology Industry Risk. The success of biotechnology companies is highly dependent on the development, procurement and/or marketing of drugs. The values of biotechnology companies are also dependent on the development, protection and exploitation of intellectual property rights and other proprietary information, and the profitability of biotechnology companies may be significantly affected by such things as the expiration of patents or the loss of, or the inability to enforce, intellectual property rights. The research and other costs associated with developing or procuring new drugs, products or technologies and the related intellectual property rights can be significant, and the results of such research and expenditures are unpredictable. There can be no assurance that those efforts or costs will result in the development of a profitable drug, product or technology.

The biotechnology sector is also subject to rapid and significant technological change and competitive forces that may make drugs, products or technologies obsolete or make it difficult to raise prices and, in fact, may result in price discounting. Companies in the biotechnology sector may also be subject to expenses and losses from extensive litigation based on intellectual property, product liability and similar claims. Companies in the biotechnology sector may be adversely affected by government regulation and changes in reimbursement rates. Healthcare providers, principally hospitals, that transact with companies in the biotechnology industry, often rely on third party payors, such as Medicare, Medicaid, private health insurance plans and health maintenance organizations to reimburse all or a portion of the cost of healthcare related products or services. Biotechnology companies will continue to be affected by the efforts of governments and third-party payors to contain or reduce health care costs.

Pharmaceutical Sector Risk. The success of companies in the pharmaceutical sector is highly dependent on the development, procurement and marketing of drugs. The values of pharmaceutical

24	abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

companies are also dependent on the development, protection and exploitation of intellectual property rights and other proprietary information, and the profitability of pharmaceutical companies may be significantly affected by such things as the expiration of patents or the loss of, or the inability to enforce, intellectual property rights. The research and other costs associated with developing or procuring new drugs and the related intellectual property rights can be significant, and the results of such research and expenditures are unpredictable. There can be no assurance that those efforts or costs will result in the development of a profitable drug.

The pharmaceutical sector is also subject to rapid and significant technological change and competitive forces that may make drugs obsolete or make it difficult to raise prices and, in fact, may result in price discounting. Companies in the pharmaceutical sector may also be subject to expenses and losses from extensive litigation based on intellectual property, product liability and similar claims. Companies in the pharmaceutical sector may be adversely affected by government regulation and changes in reimbursement rates. The ability of many pharmaceutical companies to commercialize and monetize current and any future products depends in part on the extent to which reimbursement for the cost of such products and related treatments are available from third-party payors, such as Medicare, Medicaid, private health insurance plans and health maintenance organizations.

Managed Care Sector Risk. Companies in the managed care sector often assume the risk of both medical and administrative costs for their customers in return for monthly premiums. The profitability of these products depends in large part on the ability of such companies to predict, price for, and effectively manage medical costs. Managed care companies base the premiums they charge and their Medicare bids on estimates of future medical costs over the fixed contract period; however, many factors may cause actual costs to exceed what was estimated and reflected in premiums or bids.

Managed care companies are regulated at the federal, state, local and international levels. The evolution of the ACA and other regulatory reforms could materially and adversely affect the manner in which U.S. managed care companies conduct business and their results of operations, financial position and cash flows. New laws or regulations could drive substantial change to the way healthcare products and services are currently delivered and paid for in the United States. A transformative overhaul of the U.S. healthcare system could impact the financial viability of managed care companies in which the Fund may invest.

Life Science and Tools Industry Risk. Life science industries are characterized by limited product focus, rapidly changing technology, extensive government regulation, and intense competition. In particular, technological advances can render an existing product,

which may account for a disproportionate share of a company’s revenue, obsolete. Extensive regulation can cause delays in product development, which may disadvantage a company in an intensely competitive environment. These various factors may result in abrupt advances and declines in the securities prices of particular companies, and, in some cases, may have a broad effect on the prices of securities of companies in particular life science industries.

Healthcare Technology Sector Risk. Companies in the healthcare technology sector may incur substantial cost related to product-related liabilities, interruptions at their data centers or client support facilities, claims for infringement or misappropriation of intellectual property rights of others, or infringement or misappropriation of their intellectual property. Each of these may adversely impact the prices of securities of companies in the healthcare technology sector.

Additionally, the success of healthcare technology companies depends upon the recruitment and retention of key personnel. The failure to attract and retain qualified personnel could have a material adverse effect on healthcare technology companies’ prospects for long-term growth.

Healthcare Services Sector Risk. The operations of healthcare services companies are subject to extensive federal, state and local government regulations. A violation or departure from any of these legal requirements may result in government audits, lower reimbursements, significant fines and penalties, the potential loss of certification, recoupment efforts or voluntary repayments. If healthcare services companies fail to adhere to all of the complex government regulations that apply to their businesses, such companies could suffer severe consequences that would substantially reduce revenues, earnings, cash flows and stock prices.

A substantial percentage of a healthcare services company’s service revenues may be generated from patients who have state Medicaid or other non-Medicare government-based programs, such as coverage through the Department of Veterans Affairs (“VA”), as their primary coverage. As state governments and other governmental organizations face increasing budgetary pressure, healthcare services companies may in turn face reductions in payment rates, delays in the receipt of payments, limitations on enrollee eligibility or other changes to the applicable programs.

Healthcare Supplies Sector Risk. If healthcare supplies companies are unable to successfully expand their product lines through internal research and development and acquisitions or are unable to successfully grow their business through marketing partnerships, their business may be materially and adversely affected.

Quality is extremely important to healthcare supplies companies and their customers due to the serious and costly consequences of product failure. Quality certifications are critical to the marketing success of

abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (continued)
March 31, 2026

their products and services. If a healthcare supplies company fails to meet these standards or fails to adapt to evolving standards, its reputation could be damaged, it could lose customers, and its revenue and results of operations could decline.

Healthcare Facilities Sector Risk. A healthcare facility’s ability to negotiate favorable contracts significantly affects the revenues and operating results of such healthcare facilities. If a healthcare facility is unable to enter into and maintain managed care contractual arrangements on acceptable terms, if it experiences material reductions in the contracted rates received from managed care payers, or if it has difficulty collecting from managed care payers, its results of operations could be adversely affected.

Further changes in the Medicare and Medicaid programs or other government health care programs could have an adverse effect on a healthcare facility’s business. In addition to the changes affected by the ACA, the Medicare and Medicaid programs are subject to other regulatory changes which could materially increase or decrease payments from government programs in the future, as well as affect the cost of providing services to patients and the timing of payments to facilities, which could in turn adversely affect a healthcare facility’s overall business, financial condition, results of operations or cash flows.

Healthcare Equipment Sector Risk. The medical device markets are highly competitive and characterized by rapid change, which may affect a company’s ability to be competitive. They are also rigorously regulated and it is anticipated that governmental authorities will continue to scrutinize this industry closely, and that additional regulation may increase compliance and legal costs, exposure to litigation, and other adverse effects to operations.

Healthcare equipment companies are substantially dependent on patent and other proprietary rights and failing to protect such rights or to be successful in litigation related to such rights may negatively impact the ability of healthcare equipment companies to sell current or future products. Quality problems with the processes, goods and services of a healthcare equipment company could harm the company’s reputation for producing high-quality products and erode its competitive advantage, sales and market share. Quality certifications are critical to the marketing success of goods and services. If a healthcare equipment company fails to meet these standards, its reputation could be damaged, it could lose customers, and its revenue and results of operations could decline.

Healthcare Distributors Sector Risk. Companies in the healthcare distribution sector operate in markets that are highly competitive and in an industry that is highly regulated and often subject to legal proceedings. Due to the nature of the business of healthcare

distribution companies, each of the above may have an adverse impact on the securities prices of companies in the healthcare distribution sector.

Healthcare distribution companies depend on the availability of various components, compounds, raw materials and energy supplied by others for their operations. Any of these supplier relationships could be interrupted due to events beyond the control of such companies, including pandemics, epidemics or natural disasters, or could be terminated. A sustained supply interruption could have an adverse effect on business.

h. Valuation Risk:

The price that the Fund could receive upon the sale of any particular portfolio investment may differ from the Fund's valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair valuation methodology or a price provided by an independent pricing service. As a result, the price received upon the sale of an investment may be less than the value ascribed by the Fund, and the Fund could realize a greater than expected loss or lower than expected gain upon the sale of the investment. The Fund's ability to value its investments may also be impacted by technological issues and/or errors by pricing services or other third-party service providers.

i. Venture Capital Investments Risk:

The Fund generally invests in venture capital opportunities. While these securities offer the opportunity for significant capital gains, such investments also involve a degree of risk that can result in substantial losses. Some of the venture capital opportunities in which the Fund may invest are expected to be companies that are in a “start-up” stage of development, have little or no operating history, operate at a loss or with substantial variations in operating results from period to period, have limited products, markets, financial resources or management depth, or have the need for substantial additional “follow-on” capital to support expansion or to achieve or maintain a competitive position. Such additional investments may dilute the interests of prior investors, such as the Fund. Some of these companies may be emerging companies at the research and development stage with no marketable or approved products or technology. There can be no assurance that securities of start-up or emerging growth companies will, in the future, yield returns commensurate with their associated risks.

These investments, which are considered Restricted Securities, will be made primarily in convertible preferred stock. The Fund may also purchase non-convertible debt securities in connection with its venture capital investments, and otherwise when the Investment Adviser believes that such investments would be consistent with the Fund’s investment objective. While these debt investments typically

26	abrdn Healthcare Investors

Notes to Financial Statements (unaudited) (concluded)
March 31, 2026

will not be rated, the Investment Adviser believes that, in light of the risk characteristics associated with investments in emerging growth companies, if such investments were to be compared with investments rated by S&P or Moody’s, they may be rated as low as “C” in the rating categories established by S&P and Moody’s. Such securities are commonly referred to as “junk bonds” and are considered, on balance, as predominantly speculative.

10. Contingencies

In the normal course of business, the Fund may provide general indemnifications pursuant to certain contracts and organizational

documents. The Fund's maximum exposure under these arrangements is dependent on future claims that may be made against the Fund, and therefore, cannot be estimated; however, the Fund expects the risk of loss from such claims to be remote.

11. Tax Information

The U.S. federal income tax basis of the Fund's investments (including derivatives, if applicable) and the net unrealized appreciation as of March 31, 2026, were as follows:

Tax Cost of Securities	Unrealized Appreciation	Unrealized Depreciation	Net Unrealized Appreciation/ (Depreciation)
$1,060,192,694	$299,166,378	$(220,620,203)	$78,546,175

12. Segment Reporting

Operating segments are components of a public entity that engage in business activities from which it may recognize revenues and incur expenses, have discrete financial information available, and have their operating results regularly reviewed by the public entity’s chief operating decision maker (“CODM”) when assessing segment performance and making decisions about segment resources. The Chief Financial Officer of the Fund acts as the Fund's CODM. The CODM monitors the operating results of the Fund as a whole, and the Fund's asset allocation is managed in accordance with its Prospectus. The Fund operates as a single operating and reporting segment pursuant to its investment objective and principal investment strategy. The Fund's portfolio composition, total returns, expense ratios and changes in net assets used by the CODM to assess segment performance and make resource allocations are consistent with the information presented within the Fund's financial statements. Segment assets are reflected on the Fund's Statement of Assets and Liabilities as “Total Assets” and significant segment expenses are listed on the Statement of Operations.

13. Recent Accounting Pronouncements

In December 2023, the FASB issued Accounting Standards Update 2023-09 (“ASU 2023-09”), Income Taxes (Topic 740) Improvements to Income Tax Disclosures, which amends quantitative and qualitative income tax disclosure requirements in order to increase disclosure consistency, bifurcate income tax information by jurisdiction and remove information that is no longer beneficial. The Fund has adopted ASU 2023-09 as of March 31, 2026 with no material impact on the Fund’s financial statements.

14. Subsequent Events

Management has evaluated the need for disclosures and/or adjustments resulting from subsequent events through the date the financial statements were issued.

Based on this evaluation, no disclosures and/or adjustments were required to the financial statements as of March 31, 2026, other than as noted below.

On May 11, 2026, the Fund announced that it will pay on June 30, 2026, a stock distribution of US $0.61 per share to all shareholders of record as of May 21, 2026.

abrdn Healthcare Investors

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Corporate Information

Trustees

Todd Reit, Chair
Jeffrey Bailey
Rose DiMartino
Kathleen Goetz
C. William Maher
Christian Pittard

Investment Adviser

abrdn Inc.
1900 Market Street, Suite 200
Philadelphia, PA 19103

Custodian

State Street Bank and Trust Company
John Adams Building
1776 Heritage Drive
North Quincy, MA 02171

Transfer Agent

Computershare Trust Company, N.A.
P.O. Box 43006
Providence, RI 02940-3078

Independent Registered Public Accounting Firm

KPMG LLP
191 West Nationwide Blvd., Suite 500
Columbus, OH 43215

Legal Counsel

Dechert LLP
1900 K Street N.W.
Washington, D.C. 20006

Investor Relations

abrdn Inc.
1900 Market Street, Suite 200
Philadelphia, PA 19103
1-800-522-5465
Investor.Relations@aberdeenplc.com

The Financial Statements as of March 31, 2026, included in this report, were not audited and accordingly, no opinion is expressed thereon.

Notice is hereby given in accordance with Section 23(c) of the Investment Company Act of 1940, as amended, that the Fund may purchase, from time to time, shares of its common stock in the open market.

Shares of abrdn Healthcare Investors are traded on the NYSE under the symbol “HQH.” Information about the Fund’s net asset value and market price is available at www.aberdeenhqh.com.

This report, including the financial information herein, is transmitted to the shareholders of abrdn Healthcare Investors for their general information only. It does not have regard to the specific investment objectives, financial situation and the particular needs of any specific person. Past performance is no guarantee of future results.

HQH-SEMI-ANNUAL

(b) Not applicable.

Item 2. Code of Ethics.

This item is inapplicable to semi-annual report on Form N-CSR.

Item 3. Audit Committee Financial Expert.

This item is inapplicable to semi-annual report on Form N-CSR.

Item 4. Principal Accountant Fees and Services.

This item is inapplicable to semi-annual report on Form N-CSR.

Item 5. Audit Committee of Listed Registrants.

This item is inapplicable to semi-annual report on Form N-CSR.

Item 6. Schedule of Investments.

(a) Schedule of Investments in securities of unaffiliated issuers as of close of the reporting period is included as part of the Reports to Shareholders filed under Item 1 of this Form N-CSR.

(b) Not applicable.

Item 7. Financial Statements and Financial Highlights for Open-End Management Investment Companies.

Not applicable.

Item 8. Changes in and Disagreements with Accountants for Open-End Management Investment Companies.

Not applicable.

Item 9. Proxy Disclosures for Open-End Management Investment Companies.

Not applicable.

Item 10. Remuneration Paid to Directors, Officers, and Others of Open-End Management Investment Companies.

Not applicable.

Item 11. Statement Regarding Basis for Approval of Investment Advisory Contract.

Not applicable.

Item 12. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies.

This item is inapplicable to semi-annual report on Form N-CSR.

Item 13. Portfolio Managers of Closed-End Management Investment Companies.

(a) Not applicable to semi-annual report on Form N-CSR.

(b) There has been no change, as of the date of this filing, in any of the portfolio managers identified in response to paragraph (a)(1) of this Item in the registrant’s most recently filed annual report on Form N-CSR.

Item 14. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers.

Period	(a) Total No. of Shares Purchased		(b) Average Price Paid per Share		(c) Total No. of Shares Purchased as Part of Publicly Announced Plans or Programs(1)		(d) Maximum No. of Shares that May Yet Be Purchased Under the Plans or Programs(1)
Month #1 (Oct. 1, 2025 — Oct. 31, 2025)		—		—		—		6,661,238
Month #2 (Nov. 1, 2025 — Nov. 30, 2025)		—		—		—		6,661,238
Month #3 (Dec. 1, 2025 — Dec. 31, 2025)		—		—		—		6,661,238
Month #4 (Jan. 1, 2026 — Jan. 31, 2026)		—		—		—		6,661,238
Month #5 (Feb. 1, 2026 — Feb. 28, 2026)		—		—		—		6,661,238
Month #6 (Mar. 1, 2026 — Mar. 31, 2026)		—		—		—		6,661,238
Total		—	$	—		—

(1)

On June 30, 2011, the share repurchase program was announced, which has been subsequently reviewed and approved by the Board of Trustees. In September 2025, the Board approved a change to the Program allowing the Fund to purchase, in the open market for a one-year period from October 1, 2025 to September 30, 2026, up to 12% of its outstanding common shares as of September 30, 2025, with the amount and timing of any repurchase determined at the discretion of the Fund's investment adviser. Such purchases may be made opportunistically at certain discounts to NAV per share in the reasonable judgment of management based on historical discount levels and current market conditions. If shares are repurchased, the Fund reports repurchase activity on its website on a monthly basis. For the period ended March 31, 2026, the Fund did not repurchase any shares through the Program.

Item 15. Submission of Matters to a Vote of Security Holders.

During the period ended March 31, 2026, there were no material changes to the procedures by which shareholders may recommend nominees to the Registrant’s Board of Trustees.

Item 16. Controls and Procedures.

(a)

The Registrant’s principal executive and principal financial officers, or persons performing similar functions, have concluded that the Registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940 (the “Act”) (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph, based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the Act (17 CFR 270.30a3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934, as amended (17 CFR 240.13a-15(b) or 240.15d15(b)).

(b)

There were no changes in the Registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR 270.30a-3(d))) that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting.

Item 17. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies

Not applicable

Item 18. Recovery of Erroneously Awarded Compensation

Not appliable

Item 19. Exhibits.

(a)(1)

Not applicable.

(a)(2)

Any policy required by the listing standards adopted pursuant to Rule 10D-1 under the Exchange Act (17 CFR 240.10D-1) by the registered national securities exchange or registered national securities association upon which the registrant’s securities are listed. Not applicable.

(a)(3)

The certifications of the registrant as required by Rule 30a-2(a) under the Act are exhibits to this Form N-CSR.

(a)(4)

Any written solicitation to purchase securities under Rule 23c-1 under the 1940 Act (17 CFR 270.23c-1) sent or given during the period covered by the report by or on behalf of the registrant to 10 or more persons. Not applicable.

(a)(5)

Change in Registrant’s independent public accountant. Not applicable.

(b)

The certifications of the registrant as required by Rule 30a-2(b) under the Act are exhibits to this Form N-CSR.

(c)

A copy of the Registrant’s notices to stockholders, which accompanied distributions paid, pursuant to the Registrant’s Managed Distribution Policy since the Registrant’s last filed N-CSR, are filed herewith as Exhibits (c)(1) and (c)(2), as required by the terms of the Registrant’s SEC exemptive order.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

abrdn Healthcare Investors

By:	/s/ Alan Goodson
	Alan Goodson,
	Principal Executive Officer of abrdn Healthcare Investors

Date: June 8, 2026

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

By:	/s/ Alan Goodson
	Alan Goodson,
	Principal Executive Officer of abrdn Healthcare Investors

Date: June 8, 2026

By:	/s/ Sharon Ferrari
	Sharon Ferrari,
	Principal Financial Officer of abrdn Healthcare Investors

Date: June 8, 2026

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