Perceptive Advisors LLC
· Exited
Change
−4.2M
Δ Own
−100.0%
Date
Q1 2026
AL
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Perceptive Advisors LLC
· Exited
Change
−4.2M
Δ Own
−100.0%
Date
Q1 2026
|
Perceptive Advisors LLC | Exited· Q1 2026 | – | −4.2M | −100.0% | Q1 2026 | |||||
|
AQR Capital Management LLC
· Added
Change
+1.6M
Date
Q1 2026
|
AQR Capital Management LLC | Added· Q1 2026 | – | +1.6M | – | Q1 2026 | |||||
|
Kennedy Capital Management LLC
· Reduced
Change
−1.2M
Date
Q1 2026
|
Kennedy Capital Management LLC | Reduced· Q1 2026 | – | −1.2M | – | Q1 2026 | |||||
|
Millennium Management LLC
· Added
Change
+951K
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +951K | – | Q1 2026 | |||||
|
Propel Bio Management, LLC
· New
Change
+731K
Date
Q1 2026
|
Propel Bio Management, LLC | New· Q1 2026 | – | +731K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Added
Change
+665K
Date
Q1 2026
|
Jane Street Group, LLC | Added· Q1 2026 | – | +665K | – | Q1 2026 | |||||
|
Renaissance Technologies LLC
· Added
Change
+513K
Δ Own
+146.6%
Date
Q1 2026
|
Renaissance Technologies LLC | Added· Q1 2026 | – | +513K | +146.6% | Q1 2026 | |||||
|
Ardsley Advisory Partners LP
· Reduced
Change
−500K
Date
Q1 2026
|
Ardsley Advisory Partners LP | Reduced· Q1 2026 | – | −500K | – | Q1 2026 | |||||
|
UBS Group AG
· Added
Change
+442K
Date
Q1 2026
|
UBS Group AG | Added· Q1 2026 | – | +442K | – | Q1 2026 | |||||
|
Kingdon Capital Management, L.L.C.
· Added
Change
+302K
Date
Q1 2026
|
Kingdon Capital Management, L.L.C. | Added· Q1 2026 | – | +302K | – | Q1 2026 | |||||
|
Hrt Financial LP
· New
Change
+286K
Date
Q1 2026
|
Hrt Financial LP | New· Q1 2026 | – | +286K | – | Q1 2026 | |||||
|
Deutsche Bank AG
· Reduced
Change
−267K
Date
Q1 2026
|
Deutsche Bank AG | Reduced· Q1 2026 | – | −267K | – | Q1 2026 | |||||
|
Citadel Advisors LLC
· New
Change
+266K
Date
Q1 2026
|
Citadel Advisors LLC | New· Q1 2026 | – | +266K | – | Q1 2026 | |||||
|
Goldman Sachs Group Inc
· Added
Change
+237K
Date
Q1 2026
|
Goldman Sachs Group Inc | Added· Q1 2026 | – | +237K | – | Q1 2026 | |||||
|
BNP Paribas Financial Markets
· Reduced
Change
−234K
Date
Q1 2026
|
BNP Paribas Financial Markets | Reduced· Q1 2026 | – | −234K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Miller-Rich Nancy
· Director
2 operations
73K
|
Miller-Rich Nancy | Director | 2 operations | – | 73K | – | 3K | – | Jun 9, 2026 | Jun 11, 2026 | |||||||||
|
Douglas Richard
· Director
3 operations
92K
|
Douglas Richard | Director | 3 operations | – | 92K | – | 2K | – | Jun 9, 2026 | Jun 11, 2026 | |||||||||
|
Phillips Gary M.
· Director
3 operations
82K
|
Phillips Gary M. | Director | 3 operations | – | 82K | – | 5K | – | Jun 9, 2026 | Jun 11, 2026 | |||||||||
|
Clark William D.
· Director
2 operations
72K
|
Clark William D. | Director | 2 operations | – | 72K | – | 2K | – | Jun 9, 2026 | Jun 11, 2026 | |||||||||
|
Walker Neal
· Director
2 operations
73K
|
Walker Neal | Director | 2 operations | – | 73K | – | 3K | – | Jun 9, 2026 | Jun 11, 2026 | |||||||||
|
Bronstein Ben
· Director
3 operations
80K
|
Bronstein Ben | Director | 3 operations | – | 80K | – | 5K | – | Jun 9, 2026 | Jun 11, 2026 | |||||||||
|
Deptula-Hicks Darlene M.
· Director
2 operations
94K
|
Deptula-Hicks Darlene M. | Director | 2 operations | – | 94K | – | 10K | – | Jun 9, 2026 | Jun 11, 2026 | |||||||||
|
Brady Todd C.
· Director
Buy
+$418K
|
Brady Todd C. | Director | Buy | $1.67 | +250K | +$418K | 1.7M | – | Jun 3, 2026 | Jun 5, 2026 | |||||||||
|
Brady Todd C.
· Director, Officer
2 operations
2.5M
|
Brady Todd C. | Director, Officer | 2 operations | – | 2.5M | – | 632K | – | Mar 27, 2026 | Mar 31, 2026 | |||||||||
|
Douglas Richard
· Director
Buy
+$98K
|
Douglas Richard | Director | Buy | $1.40 | +70K | +$98K | 195K | – | Mar 19, 2026 | Mar 20, 2026 | |||||||||
|
Alfieri Michael
· Officer
Buy
+$7K
|
Alfieri Michael | Officer | Buy | $1.42 | +5K | +$7K | 8K | – | Mar 18, 2026 | Mar 19, 2026 | |||||||||
|
Alfieri Michael
· Officer
Buy
+$13K
|
Alfieri Michael | Officer | Buy | $5.30 | +2K | +$13K | 2K | – | Aug 13, 2025 | Aug 15, 2025 | |||||||||
|
Machatha Stephen
· Officer
Sell
−$114K
|
Machatha Stephen | Officer | Sell | $5.15 | −22K | −$114K | 222K | – | Aug 11, 2025 | Aug 13, 2025 | |||||||||
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134 reporting institutions disclosed ALDX position changes in the Q1 2026 snapshot.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.