Aldeyra Therapeutics, Inc. (ALDX) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

59,141,085Shares Outstanding

6,214,043Shares held by institutions

$32,002,321Value of institutional holdings

65.48%Institutional ownership %

1.18%Shares Changed QoQ

128No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Recent 13F filings as of December 2025 show that 128 institutional investors hold a position in Aldeyra Therapeutics, Inc. (NASDAQ:ALDX).

Aldeyra Therapeutics saw its institutional ownership percentage fell to 65.5% in December 2025 from 66.6% in September 2025.
Institutional share ownership changed by 1.18% QoQ, while the number of institutional owners saw an increase of 7.56% YoY.
Among the 128 institutional holders of Aldeyra Therapeutics, 57 added to their stakes while 50 trimmed their positions and 21 held steady.
Collectively, institutional investors increased their stake in Aldeyra Therapeutics to 38.73Mn shares as of December 2025, a change that is up by 450.50K shares quarter on quarter and up 1.13Mn shares year over year.
Knoll Capital Management, LLC continues to be the largest institutional holder of Aldeyra Therapeutics as of December 31, 2025, with a position of 5.48Mn shares, representing 9.26% of the company's outstanding stock.
Among the most significant buyers of Aldeyra Therapeutics during December 2025 were 683 Capital Management, LLC (710.00K), KINGDON CAPITAL MANAGEMENT, L.L.C. (518.21K), BNP PARIBAS FINANCIAL MARKETS (252.80K), 1492 Capital Management LLC (223.32K), D. E. Shaw & Co., Inc. (221.48K).
Leading sellers of Aldeyra Therapeutics stock in December 2025 included PERCEPTIVE ADVISORS LLC (1.04Mn), ARDSLEY ADVISORY PARTNERS LP (450.00K), MORGAN STANLEY (426.29K), AQR CAPITAL MANAGEMENT LLC (278.44K), MILLENNIUM MANAGEMENT LLC (177.11K).
The top 10 institutional holders of Aldeyra Therapeutics for the quarter ending December 2025 included Knoll Capital Management, LLC (5.48Mn), PERCEPTIVE ADVISORS LLC (4.19Mn), BlackRock, Inc. (3.85Mn), VANGUARD GROUP INC (3.70Mn), KINGDON CAPITAL MANAGEMENT, L.L.C. (1.85Mn), D. E. Shaw & Co., Inc. (1.60Mn), 683 Capital Management, LLC (1.53Mn), ARDSLEY ADVISORY PARTNERS LP (1.45Mn), KENNEDY CAPITAL MANAGEMENT LLC (1.26Mn), AQR CAPITAL MANAGEMENT LLC (1.23Mn).

128 Institutional Holders

6,214,043 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
Knoll Capital Management, LLC	31 Dec, 2025	5,475,516	0	0.00%	$28,363,172.00
PERCEPTIVE ADVISORS LLC	31 Dec, 2025	4,185,632	-1,036,679	-19.85%	$21,681,574.00
BlackRock, Inc.	31 Dec, 2025	3,850,103	45,183	1.19%	$19,943,533.00
VANGUARD GROUP INC	31 Dec, 2025	3,698,682	106,813	2.97%	$19,159,173.00
KINGDON CAPITAL MANAGEMENT, L.L.C.	31 Dec, 2025	1,850,000	518,209	38.91%	$9,583,000.00
D. E. Shaw & Co., Inc.	31 Dec, 2025	1,601,324	221,481	16.05%	$8,294,858.00
683 Capital Management, LLC	31 Dec, 2025	1,530,000	710,000	86.59%	$7,925,400.00
ARDSLEY ADVISORY PARTNERS LP	31 Dec, 2025	1,450,000	-450,000	-23.68%	$7,511,000.00
KENNEDY CAPITAL MANAGEMENT LLC	31 Dec, 2025	1,255,838	143,625	12.91%	$6,505,241.00
AQR CAPITAL MANAGEMENT LLC	31 Dec, 2025	1,226,922	-278,438	-18.50%	$6,355,456.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	1,170,537	-5,883	-0.50%	$6,064,616.00
STATE STREET CORP	31 Dec, 2025	1,098,600	-4,074	-0.37%	$5,690,748.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	979,521	143,710	17.19%	$5,071.00
JACOBS LEVY EQUITY MANAGEMENT, INC	31 Dec, 2025	968,751	21,200	2.24%	$5,018,130.00
MORGAN STANLEY	31 Dec, 2025	657,032	-426,287	-39.35%	$3,403,426.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	612,258	-36,113	-5.57%	$3,171,391.00
BANK OF AMERICA CORP /DE/	31 Dec, 2025	410,028	19,950	5.11%	$2,123,946.00
JANE STREET GROUP, LLC	31 Dec, 2025	383,352	97,634	34.17%	$1,985,764.00
NORTHERN TRUST CORP	31 Dec, 2025	379,405	-28,555	-7.00%	$1,965,318.00
WELLS FARGO & COMPANY/MN	31 Dec, 2025	366,169	4,700	1.30%	$1,896,755.00

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