Security key
01438T106
Aldeyra Therapeutics, Inc. - Common Stock, par value $0.001 per share (ALDX)
CUSIP: 01438T106
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / Common Stock, par value $0.001 per share
- Total 13F shares
- 37,245,509
- Total 13F value
- $62,940,631
- Share change
- -1,218,884
- Put/Call ratio
- 51%
- SEC-reported price per share
- $1.69
- Number of holders
- 124
- Value change
- -$20,481,964
- Number of buys
- 68
- Number of sells
- 64
- Shares outstanding
- 59,794,743
Holder snapshot
7 signals
Show 1 more signal
Security identity
1 source field
Report period
Q1 2026
Institutions
124
Top holders
10
ALDX full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q4 2025
Aldeyra Therapeutics, Inc. SEC filings
Aldeyra Therapeutics, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 01438T106
Recent filing periods:
Ownership snapshot
Top reported holders of ALDX - Aldeyra Therapeutics, Inc. - Common Stock, par value $0.001 per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Michael Alfieri
Disclosed value leader
Knoll Capital Management,...
Comparable rows
15/15
Latest evidence
18 Mar 2026
3/4/5
13F
Lead comparable stake: 0.01%
Showing 1-6 of 15 holder rows.
Quick read
Michael Alfieri leads the comparable SEC ownership view at 0.01%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Comparable ownership
Top 5
Michael Alfieri
0.01%
Knoll Capital Management, LLC
9.2%
PERCEPTIVE ADVISORS LLC
7%
BlackRock, Inc.
6.4%
VANGUARD GROUP INC
6.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Michael Alfieri |
3/4/5
Principal Financial Officer
|
0.01%
|
$10,650
7,500 shares
|
+$20,350 | 18 Mar 2026 |
| Knoll Capital Management, LLC |
13F
Company
|
9.2%
|
$28,363,172
5,475,516 shares
|
— | 31 Dec 2025 |
| PERCEPTIVE ADVISORS LLC |
3/4/5
13F
10%+ Owner · Company
|
7%
from 13F
|
$27,829,793
5,875,851 shares
|
— | 03 Apr 2025 |
| BlackRock, Inc. |
13F
Company
|
6.4%
|
$19,943,533
3,850,103 shares
|
— | 31 Dec 2025 |
| VANGUARD GROUP INC |
13F
Company
|
6.2%
|
$19,159,173
3,698,682 shares
|
— | 31 Dec 2025 |
| KINGDON CAPITAL MANAGEMENT, L.L.C. |
13F
Company
|
3.1%
|
$9,583,000
1,850,000 shares
|
— | 31 Dec 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
124
Shares
37,245,509
Rows available
124
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2026 vs Q4 2025 Across Filers
Q4 2025 holders
135
Q1 2026 holders
124
Holder diff
-11
| Investor | Q4 2025 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend