Aldeyra Therapeutics, Inc.
Aldeyra Therapeutics, Inc. (ALDX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ALDX · as of Mar 31, 2025
Ownership Breakdown
134
Institutional Holders
▲ 9 vs Q4
$225.55M
Total Inst. Value
▲ $39.98M vs Q4
60.32M
Shares Outstanding
freeFloat 87.74%
37.89M
13F Shares Held
▲ 696,058 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ALDX largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
PERCEPTIVE ADVISORS LLC pharmaceutical preparations | 9.28M | 15.49% | 15.49% | $53.34B | Aug 6, 2025 | — held |
KNOLL CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 5.48M | 9.20% | 9.20% | $31.48B | May 15, 2025 | — held |
BLACKROCK, INC. pharmaceutical preparations | 3.74M | 6.24% | 6.24% | $21.48B | May 2, 2025 | ▼ 54.2K |
VANGUARD GROUP INC pharmaceutical preparations | 3.72M | 6.21% | 6.21% | $21.38B | May 9, 2025 | ▼ 38.8K |
ARDSLEY ADVISORY PARTNERS LP pharmaceutical preparations | 1.75M | 2.92% | 2.92% | $9.89B | May 15, 2025 | ▲ 600.0K |
KENNEDY CAPITAL MANAGEMENT LLC pharmaceutical preparations | 1.23M | 2.06% | 2.06% | $7.09B | May 13, 2025 | ▼ 235.1K |
GEODE CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 1.14M | 1.90% | 1.90% | $6.54B | May 13, 2025 | ▲ 18.3K |
STATE STREET CORP pharmaceutical preparations | 1.02M | 1.71% | 1.71% | $5.87B | May 15, 2025 | ▼ 12.0K |
KINGDON CAPITAL MANAGEMENT, L.L.C. pharmaceutical preparations | 779.0K | 1.30% | 1.30% | $4.48B | May 15, 2025 | NEW |
DIMENSIONAL FUND ADVISORS LP pharmaceutical preparations | 669.9K | 1.12% | 1.12% | $3.85B | May 13, 2025 | ▼ 65.9K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
14
Increased
+2.10M shares3
New Positions
first time holders28
Decreased
−2.42M shares0
Sold Out
fully exitedNet shares change (top 50)
318.1K
+2.10M / −2.42M
Net new holders
-11
3 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ALDX insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Brady Todd C President and CEO | Jun 3, 2026 | Purchase | 250,000 | $1.67 | $418.4K | 1.72M | Form 4 ↗ |
Brady Todd C President and CEO | Mar 27, 2026 | Award | 1,880,510 | $1.77 | $3.33M | 1.88M | Form 4 ↗ |
Brady Todd C President and CEO | Mar 27, 2026 | Award | 632,318 | — | — | 632.3K | Form 4 ↗ |
DOUGLAS RICHARD director | Mar 19, 2026 | Purchase | 70,000 | $1.40 | $98.0K | 195.0K | Form 4 ↗ |
Alfieri Michael Principal Financial Officer | Mar 18, 2026 | Purchase | 5,000 | $1.42 | $7.1K | 7.5K | Form 4 ↗ |
Alfieri Michael Principal Financial Officer | Aug 13, 2025 | Purchase | 2,500 | $5.30 | $13.3K | 2.5K | Form 4 ↗ |
Machatha Stephen Chief Development Officer | Aug 11, 2025 | Sale | 22,073 | $5.15 | $113.7K | 221.8K | Form 4 ↗ |
Walker Neal director | Jun 10, 2025 | Award | 62,728 | $2.69 | $168.4K | 62.7K | Form 4 ↗ |
Walker Neal director | Jun 10, 2025 | Award | 2,413 | $2.69 | $6.5K | 2.4K | Form 4 ↗ |
Miller-Rich Nancy director | Jun 10, 2025 | Award | 62,728 | $2.69 | $168.4K | 62.7K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Aldeyra Therapeutics, Inc. (ALDX) is primarily owned by institutional investors, who hold approximately 62.8% of total shares outstanding. Company insiders own approximately 12.26%, while retail and public investors account for the remaining 24.93%.
The largest institutional shareholder of Aldeyra Therapeutics, Inc. is PERCEPTIVE ADVISORS LLC, holding approximately 9.28 million shares — equal to 15.49% of outstanding shares — as of March 31, 2025.
A total of 134 institutional investors currently hold ALDX stock, with a combined institutional value of approximately $225,546,048 as of the most recent 13F filing period.
Frequently asked questions
ALDX ownershipAldeyra Therapeutics, Inc. (ALDX) is primarily owned by institutional investors, who hold approximately 62.8% of shares. The largest shareholder is PERCEPTIVE ADVISORS LLC with a 15.49% stake. Company insiders hold 12.26%. Data sourced from SEC Form 13F as of March 31, 2025.