Capital World Investors
· Reduced
−$1.9B
Change
−5.5M
Date
Q1 2026
AL
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Capital World Investors
· Reduced
−$1.9B
Change
−5.5M
Date
Q1 2026
|
Capital World Investors | Reduced· Q1 2026 | −$1.9B | −5.5M | – | Q1 2026 | |||||
|
T. Rowe Price Investment Management, Inc.
· Added
+$1.2B
Change
+3.4M
Date
Q1 2026
|
T. Rowe Price Investment Management, Inc. | Added· Q1 2026 | +$1.2B | +3.4M | – | Q1 2026 | |||||
|
Capital Research Global Investors
· Added
+$916M
Change
+2.7M
Δ Own
+39.7%
Date
Q1 2026
|
Capital Research Global Investors | Added· Q1 2026 | +$916M | +2.7M | +39.7% | Q1 2026 | |||||
|
Norges
· Exited
−$766M
Change
−2.3M
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | −$766M | −2.3M | −100.0% | Q1 2026 | |||||
|
JPMorgan Chase & Co
· Added
+$546M
Change
+1.6M
Date
Q1 2026
|
JPMorgan Chase & Co | Added· Q1 2026 | +$546M | +1.6M | – | Q1 2026 | |||||
|
Two Sigma Investments, LP
· Added
+$468M
Change
+1.4M
Δ Own
+223.4%
Date
Q1 2026
|
Two Sigma Investments, LP | Added· Q1 2026 | +$468M | +1.4M | +223.4% | Q1 2026 | |||||
|
FMR LLC
· Reduced
−$450M
Change
−1.3M
Δ Own
−8.3%
Date
Q1 2026
|
FMR LLC | Reduced· Q1 2026 | −$450M | −1.3M | −8.3% | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
−$385M
Change
−1.1M
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | −$385M | −1.1M | −100.0% | Q1 2026 | |||||
|
Arrowstreet Capital, Limited Partnership
· Exited
−$383M
Change
−1.1M
Δ Own
−100.0%
Date
Q1 2026
|
Arrowstreet Capital, Limited Partnership | Exited· Q1 2026 | −$383M | −1.1M | −100.0% | Q1 2026 | |||||
|
Invesco Ltd.
· Reduced
−$297M
Change
−874K
Δ Own
−40.4%
Date
Q1 2026
|
Invesco Ltd. | Reduced· Q1 2026 | −$297M | −874K | −40.4% | Q1 2026 | |||||
|
Clearbridge Investments, LLC
· Added
+$258M
Change
+759K
Date
Q1 2026
|
Clearbridge Investments, LLC | Added· Q1 2026 | +$258M | +759K | – | Q1 2026 | |||||
|
D. E. Shaw & Co., Inc.
· Added
+$209M
Change
+615K
Δ Own
+138.3%
Date
Q1 2026
|
D. E. Shaw & Co., Inc. | Added· Q1 2026 | +$209M | +615K | +138.3% | Q1 2026 | |||||
|
Manufacturers Life Insurance Company, the
· Added
+$204M
Change
+599K
Date
Q1 2026
|
Manufacturers Life Insurance Company, the | Added· Q1 2026 | +$204M | +599K | – | Q1 2026 | |||||
|
Marshall Wace, LLP
· Added
+$187M
Change
+549K
Date
Q1 2026
|
Marshall Wace, LLP | Added· Q1 2026 | +$187M | +549K | – | Q1 2026 | |||||
|
1832 Asset Management L.P.
· Exited
−$150M
Change
−440K
Δ Own
−100.0%
Date
Q1 2026
|
1832 Asset Management L.P. | Exited· Q1 2026 | −$150M | −440K | −100.0% | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Pyott David E. I.
· Director
5 operations
−$1.1M
|
Pyott David E. I. | Director | 5 operations | $297.71–$302.65 | −4K | −$1.1M | 2K | – | Jun 1, 2026 | Jun 3, 2026 | |||||||||
|
Pyott David E. I.
· Director
2 operations
0
|
Pyott David E. I. | Director | 2 operations | – | 0 | – | 0 | – | Jun 1, 2026 | Jun 3, 2026 | |||||||||
|
Cravatt Benjamin
· Director
Grant (A)
4K
|
Cravatt Benjamin | Director | Grant (A) | – | 4K | – | 4K | – | Jun 1, 2026 | Jun 3, 2026 | |||||||||
|
Sigal Charles Elliott
· Director
2 operations
2K
|
Sigal Charles Elliott | Director | 2 operations | – | 2K | – | 1K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Schulman Amy W.
· Director
2 operations
3K
|
Schulman Amy W. | Director | 2 operations | – | 3K | – | 2K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Reitan Colleen F.
· Director
2 operations
2K
|
Reitan Colleen F. | Director | 2 operations | – | 2K | – | 1K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Pyott David E. I.
· Director
2 operations
2K
|
Pyott David E. I. | Director | 2 operations | – | 2K | – | 1K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Kellogg Peter N.
· Director
2 operations
2K
|
Kellogg Peter N. | Director | 2 operations | – | 2K | – | 1K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Hamburg Margaret A.
· Director
2 operations
2K
|
Hamburg Margaret A. | Director | 2 operations | – | 2K | – | 1K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Brandicourt Olivier
· Director
2 operations
2K
|
Brandicourt Olivier | Director | 2 operations | – | 2K | – | 1K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Ausiello Dennis A.
· Director
2 operations
2K
|
Ausiello Dennis A. | Director | 2 operations | – | 2K | – | 1K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Arbuckle Stuart A.
· Director
2 operations
2K
|
Arbuckle Stuart A. | Director | 2 operations | – | 2K | – | 1K | – | May 20, 2026 | May 22, 2026 | |||||||||
|
Schulman Amy W.
· Director
2 operations
0
|
Schulman Amy W. | Director | 2 operations | $70.20 | 0 | – | 0 | – | May 13, 2026 | May 14, 2026 | |||||||||
|
McLaughlin Melissa
· Officer
5 operations
−$755K
|
McLaughlin Melissa | Officer | 5 operations | $320.14–$333.94 | −2K | −$755K | 9K | – | Apr 6, 2026 | Apr 7, 2026 | |||||||||
|
McLaughlin Melissa
· Officer
9 operations
−$519K
|
McLaughlin Melissa | Officer | 9 operations | $316.61–$325.49 | −2K | −$519K | 12K | – | Apr 2, 2026 | Apr 7, 2026 | |||||||||
N
M
G
A
A
A
820 reporting institutions disclosed ALNY 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.