Aldeyra Therapeutics Ownership | Who Owns Aldeyra Therapeutics?

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Aldeyra Therapeutics Ownership Summary

Aldeyra Therapeutics is owned by 8.70% institutional investors, 3.09% insiders, and 88.22% retail investors. Knoll capital management is the largest institutional shareholder, holding 9.12% of ALDX shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 2.95% of its assets in Aldeyra Therapeutics shares.

ALDX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Aldeyra Therapeutics	8.70%	3.09%	88.22%
Sector	Healthcare Stocks	42.51%	10.81%	46.68%
Industry	Biotech Stocks	45.22%	10.75%	44.04%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Knoll capital management	5.48M	9.12%	$28.58M
Perceptive advisors	5.22M	8.70%	$27.26M
Blackrock funding, inc. /de	3.80M	6.34%	$19.86M
Blackrock	3.62M	6.10%	$11.99M
Vanguard group	3.59M	5.98%	$18.75M
Ardsley advisory partners lp	1.90M	3.16%	$9.92M
Kingdon capital management	1.33M	2.22%	$6.95M
Geode capital management	1.18M	1.96%	$6.14M
Kennedy capital management	1.11M	1.85%	$5.81M
State street	1.10M	1.84%	$5.76M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Knoll capital management	5.48M	15.32%	$28.58M
Ardsley advisory partners lp	1.90M	1.23%	$9.92M
Kingdon capital management	1.33M	0.86%	$6.95M
Perceptive advisors	5.22M	0.79%	$27.26M
Alphacentric advisors	46.91K	0.23%	$234.10K
683 capital management	820.00K	0.22%	$4.28M
Palo alto investors lp	225.47K	0.22%	$1.18M
Kennedy capital management	1.11M	0.13%	$5.81M
Woodstock	266.76K	0.12%	$1.39M
Providence wealth advisors	25.00K	0.08%	$128.50K

Top Buyers

Holder	Shares	% Assets	Change
Perceptive advisors	5.22M	0.79%	1.17M
Acadian asset management	835.81K	0.01%	643.41K
Kennedy capital management	1.11M	0.13%	425.25K
Blackrock	3.62M	0.00%	311.16K
Morgan stanley	1.08M	0.00%	308.28K

Top Sellers

Holder	Shares	% Assets	Change
Federated hermes	-	-	-551.09K
Johnson & johnson	-	-	-299.67K
683 capital management	820.00K	0.22%	-260.00K
Adar1 capital management	-	-	-249.92K
Pfg investments	66.00K	0.02%	-191.30K

New Positions

Holder	Shares	% Assets	Change	Value
Marshall wace, llp	160.21K	0.00%	160.21K	$836.31K
Y-intercept (hong kong)	138.09K	0.02%	138.09K	$720.84K
State of wisconsin investment board	60.89K	0.00%	60.89K	$317.87K
Quantinno capital management lp	51.32K	0.00%	51.32K	$267.91K
Alphacentric advisors	46.91K	0.23%	46.91K	$234.10K

Sold Out

Holder	Change
Nelson, van denburg & campbell wealth management group	-9.00
Ifp advisors	-13.00
Capital performance advisors llp	-17.00
Parallel advisors	-30.00
Innealta capital	-46.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	46	-61.67%	5,222,346	-83.31%	8	0.32%	22	-63.93%	10	-70.59%
Jun 30, 2025	128	-4.48%	34,265,682	-9.56%	57	1.43%	66	26.92%	35	-25.53%
Mar 31, 2025	12	-90.32%	15,581,741	-57.99%	26	0.67%	5	-91.94%	3	-88.00%
Dec 31, 2024	123	5.13%	31,618,255	-13.84%	53	1.40%	62	3.33%	25	4.17%
Sep 30, 2024	117	9.35%	36,698,492	3.87%	61	1.74%	60	13.21%	24	-22.58%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	1.76M	2.95%	-
Vanguard Total Stock Mkt Idx Inv	1.74M	2.90%	-38.44K
iShares Russell 2000 ETF	1.34M	2.23%	-
Fidelity Small Cap Index	545.38K	0.91%	34.11K
Vanguard Institutional Extnd Mkt Idx Tr	481.33K	0.80%	-219.33K
iShares Russell 2000 Value ETF	412.16K	0.69%	-
Invesco Dorsey Wright SmallCap Momt ETF	406.98K	0.68%	-
iShares Russell 2000 Growth ETF	402.73K	0.67%	-
Kennedy Micro Cap	342.52K	0.57%	-122.33K
Vanguard Explorer Inv	331.51K	0.55%	-261.35K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 13, 2025	Alfieri Michael	Principal Financial Officer	Buy	$13.25K
Aug 11, 2025	Machatha Stephen	Chief Development Officer	Sell	$113.71K
Apr 03, 2025	PERCEPTIVE ADVISORS LLC	-	Sell	$4.83M
May 03, 2021	Miller-Rich Nancy	-	Buy	$5.29K
Apr 12, 2023	Miller-Rich Nancy	-	Buy	$5.16K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	1	1
2025 Q2	-	1
2025 Q1	-	-
2024 Q3	-	2
2024 Q2	5	-

ALDX Ownership FAQ

Who Owns Aldeyra Therapeutics?

Aldeyra Therapeutics shareholders are primarily institutional investors at 8.70%, followed by 3.09% insiders and 88.21% retail investors. The average institutional ownership in Aldeyra Therapeutics's industry, Biotech Stocks , is 45.22%, which Aldeyra Therapeutics falls below.

Who owns the most shares of Aldeyra Therapeutics?

Aldeyra Therapeutics’s largest shareholders are Knoll capital management (5.48M shares, 9.12%), Perceptive advisors (5.22M shares, 8.70%), and Blackrock funding, inc. /de (3.8M shares, 6.34%). Together, they hold 24.15% of Aldeyra Therapeutics’s total shares outstanding.

Does Blackrock own Aldeyra Therapeutics?

Yes, BlackRock owns 6.10% of Aldeyra Therapeutics, totaling 3.62M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 11.99M$. In the last quarter, BlackRock increased its holdings by 311.16K shares, a 9.40% change.

Who is Aldeyra Therapeutics’s biggest shareholder by percentage of total assets invested?

Knoll capital management is Aldeyra Therapeutics’s biggest shareholder by percentage of total assets invested, with 15.32% of its assets in 5.48M Aldeyra Therapeutics shares, valued at 28.58M$.

Who is the top mutual fund holder of Aldeyra Therapeutics shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Aldeyra Therapeutics shares, with 2.95% of its total shares outstanding invested in 1.76M Aldeyra Therapeutics shares.

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