Citadel Advisors LLC
· Reduced
Change
−5.6M
Δ Own
−90.7%
Date
Q1 2026
AM
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Citadel Advisors LLC
· Reduced
Change
−5.6M
Δ Own
−90.7%
Date
Q1 2026
|
Citadel Advisors LLC | Reduced· Q1 2026 | – | −5.6M | −90.7% | Q1 2026 | |||||
|
Millennium Management LLC
· Reduced
Change
−3.0M
Date
Q1 2026
|
Millennium Management LLC | Reduced· Q1 2026 | – | −3.0M | – | Q1 2026 | |||||
|
Rubric Capital Management LP
· Reduced
Change
−1.3M
Date
Q1 2026
|
Rubric Capital Management LP | Reduced· Q1 2026 | – | −1.3M | – | Q1 2026 | |||||
|
Susquehanna International Group, LLP
· Reduced
Change
−1.3M
Date
Q1 2026
|
Susquehanna International Group, LLP | Reduced· Q1 2026 | – | −1.3M | – | Q1 2026 | |||||
|
Jain Global LLC
· Exited
Change
−1.1M
Δ Own
−100.0%
Date
Q1 2026
|
Jain Global LLC | Exited· Q1 2026 | – | −1.1M | −100.0% | Q1 2026 | |||||
|
Jane Street Group, LLC
· Exited
Change
−976K
Δ Own
−100.0%
Date
Q1 2026
|
Jane Street Group, LLC | Exited· Q1 2026 | – | −976K | −100.0% | Q1 2026 | |||||
|
D. E. Shaw & Co., Inc.
· Reduced
Change
−942K
Δ Own
−35.4%
Date
Q1 2026
|
D. E. Shaw & Co., Inc. | Reduced· Q1 2026 | – | −942K | −35.4% | Q1 2026 | |||||
|
Norges
· Exited
Change
−890K
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | – | −890K | −100.0% | Q1 2026 | |||||
|
Qube Research & Technologies Ltd
· Reduced
Change
−771K
Date
Q1 2026
|
Qube Research & Technologies Ltd | Reduced· Q1 2026 | – | −771K | – | Q1 2026 | |||||
|
Assenagon Asset Management S.A.
· Reduced
Change
−694K
Date
Q1 2026
|
Assenagon Asset Management S.A. | Reduced· Q1 2026 | – | −694K | – | Q1 2026 | |||||
|
Exoduspoint Capital Management, LP
· Reduced
Change
−664K
Date
Q1 2026
|
Exoduspoint Capital Management, LP | Reduced· Q1 2026 | – | −664K | – | Q1 2026 | |||||
|
Balyasny Asset Management L.P.
· Reduced
Change
−611K
Date
Q1 2026
|
Balyasny Asset Management L.P. | Reduced· Q1 2026 | – | −611K | – | Q1 2026 | |||||
|
Arrowstreet Capital, Limited Partnership
· Reduced
Change
−566K
Date
Q1 2026
|
Arrowstreet Capital, Limited Partnership | Reduced· Q1 2026 | – | −566K | – | Q1 2026 | |||||
|
Pfm Health Sciences, LP
· Reduced
Change
−535K
Date
Q1 2026
|
Pfm Health Sciences, LP | Reduced· Q1 2026 | – | −535K | – | Q1 2026 | |||||
|
Informed Momentum Co LLC
· Exited
Change
−426K
Δ Own
−100.0%
Date
Q1 2026
|
Informed Momentum Co LLC | Exited· Q1 2026 | – | −426K | −100.0% | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Autor Deborah M.
· Director
Sell
−$451K
|
Autor Deborah M. | Director | Sell | $12.94 | −35K | −$451K | 94K | – | May 11, 2026 | May 12, 2026 | |||||||||
|
Buchi J. Kevin
· Director
2 operations
0
|
Buchi J. Kevin | Director | 2 operations | – | 0 | – | 0 | – | May 7, 2026 | May 8, 2026 | |||||||||
|
Autor Deborah M.
· Director
2 operations
0
|
Autor Deborah M. | Director | 2 operations | – | 0 | – | 0 | – | May 7, 2026 | May 8, 2026 | |||||||||
|
George Jeffrey P.
· Director
2 operations
0
|
George Jeffrey P. | Director | 2 operations | – | 0 | – | 0 | – | May 7, 2026 | May 8, 2026 | |||||||||
|
Patel Gautam
· Director
2 operations
0
|
Patel Gautam | Director | 2 operations | – | 0 | – | 0 | – | May 7, 2026 | May 8, 2026 | |||||||||
|
Kiely John
· Director
2 operations
0
|
Kiely John | Director | 2 operations | – | 0 | – | 0 | – | May 7, 2026 | May 8, 2026 | |||||||||
|
Nark Ted C.
· Director
2 operations
0
|
Nark Ted C. | Director | 2 operations | – | 0 | – | 0 | – | May 7, 2026 | May 8, 2026 | |||||||||
|
Meister Paul M.
· Director
2 operations
0
|
Meister Paul M. | Director | 2 operations | – | 0 | – | 0 | – | May 7, 2026 | May 8, 2026 | |||||||||
|
Yanai Shlomo
· Director
2 operations
0
|
Yanai Shlomo | Director | 2 operations | – | 0 | – | 0 | – | May 7, 2026 | May 8, 2026 | |||||||||
|
Buchi J. Kevin
· Director
Grant (A)
20K
|
Buchi J. Kevin | Director | Grant (A) | – | 20K | – | 20K | – | May 6, 2026 | May 8, 2026 | |||||||||
|
Autor Deborah M.
· Director
Grant (A)
20K
|
Autor Deborah M. | Director | Grant (A) | – | 20K | – | 20K | – | May 6, 2026 | May 8, 2026 | |||||||||
|
George Jeffrey P.
· Director
Grant (A)
20K
|
George Jeffrey P. | Director | Grant (A) | – | 20K | – | 20K | – | May 6, 2026 | May 8, 2026 | |||||||||
|
Patel Gautam
· Director
Grant (A)
20K
|
Patel Gautam | Director | Grant (A) | – | 20K | – | 20K | – | May 6, 2026 | May 8, 2026 | |||||||||
|
Kiely John
· Director
Grant (A)
20K
|
Kiely John | Director | Grant (A) | – | 20K | – | 20K | – | May 6, 2026 | May 8, 2026 | |||||||||
|
Nark Ted C.
· Director
Grant (A)
20K
|
Nark Ted C. | Director | Grant (A) | – | 20K | – | 20K | – | May 6, 2026 | May 8, 2026 | |||||||||
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299 reporting institutions disclosed AMRX 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.