D. E. Shaw & Co., Inc.
· Added
+$1.0B
Change
+13.1M
Δ Own
+116.1%
Date
Q1 2026
BS
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
D. E. Shaw & Co., Inc.
· Added
+$1.0B
Change
+13.1M
Δ Own
+116.1%
Date
Q1 2026
|
D. E. Shaw & Co., Inc. | Added· Q1 2026 | +$1.0B | +13.1M | +116.1% | Q1 2026 | |||||
|
Wellington Management Group LLP
· Added
+$730M
Change
+9.1M
Δ Own
+94.0%
Date
Q1 2026
|
Wellington Management Group LLP | Added· Q1 2026 | +$730M | +9.1M | +94.0% | Q1 2026 | |||||
|
JPMorgan Chase & Co
· Added
+$638M
Change
+8.0M
Date
Q1 2026
|
JPMorgan Chase & Co | Added· Q1 2026 | +$638M | +8.0M | – | Q1 2026 | |||||
|
Two Sigma Investments, LP
· Added
+$555M
Change
+6.9M
Δ Own
+280.8%
Date
Q1 2026
|
Two Sigma Investments, LP | Added· Q1 2026 | +$555M | +6.9M | +280.8% | Q1 2026 | |||||
|
Assenagon Asset Management S.A.
· Added
+$460M
Change
+5.8M
Date
Q1 2026
|
Assenagon Asset Management S.A. | Added· Q1 2026 | +$460M | +5.8M | – | Q1 2026 | |||||
|
1832 Asset Management L.P.
· Added
+$404M
Change
+5.1M
Date
Q1 2026
|
1832 Asset Management L.P. | Added· Q1 2026 | +$404M | +5.1M | – | Q1 2026 | |||||
|
Vontobel Holding Ltd.
· Added
+$337M
Change
+4.2M
Date
Q1 2026
|
Vontobel Holding Ltd. | Added· Q1 2026 | +$337M | +4.2M | – | Q1 2026 | |||||
|
AQR Capital Management LLC
· Added
+$331M
Change
+4.1M
Date
Q1 2026
|
AQR Capital Management LLC | Added· Q1 2026 | +$331M | +4.1M | – | Q1 2026 | |||||
|
Janus Henderson Group PLC
· Added
+$313M
Change
+3.9M
Date
Q1 2026
|
Janus Henderson Group PLC | Added· Q1 2026 | +$313M | +3.9M | – | Q1 2026 | |||||
|
Neuberger Berman Group LLC
· Added
+$245M
Change
+3.1M
Date
Q1 2026
|
Neuberger Berman Group LLC | Added· Q1 2026 | +$245M | +3.1M | – | Q1 2026 | |||||
|
First Manhattan Co. LLC.
· Added
+$242M
Change
+3.0M
Date
Q1 2026
|
First Manhattan Co. LLC. | Added· Q1 2026 | +$242M | +3.0M | – | Q1 2026 | |||||
|
Ensign Peak Advisors, Inc
· Added
+$234M
Change
+2.9M
Date
Q1 2026
|
Ensign Peak Advisors, Inc | Added· Q1 2026 | +$234M | +2.9M | – | Q1 2026 | |||||
|
Arrowstreet Capital, Limited Partnership
· Added
+$228M
Change
+2.9M
Date
Q1 2026
|
Arrowstreet Capital, Limited Partnership | Added· Q1 2026 | +$228M | +2.9M | – | Q1 2026 | |||||
|
UBS AM
· Added
+$206M
Change
+2.6M
Date
Q1 2026
|
UBS AM | Added· Q1 2026 | +$206M | +2.6M | – | Q1 2026 | |||||
|
Adage Capital Partners Gp, L.L.C.
· Added
+$204M
Change
+2.6M
Date
Q1 2026
|
Adage Capital Partners Gp, L.L.C. | Added· Q1 2026 | +$204M | +2.6M | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Monson Jonathan
· Officer
2 operations
0
|
Monson Jonathan | Officer | 2 operations | – | 0 | – | 6K | – | Jul 1, 2026 | Jul 2, 2026 | |||||||||
|
Monson Jonathan
· Officer
Tax withholding or exercise payment (F)
-$43K
|
Monson Jonathan | Officer | Tax withholding or exercise payment (F) | $43.06 | -1K | -$43K | 39K | −2.5% | Jul 1, 2026 | Jul 2, 2026 | |||||||||
|
Mahoney Michael F.
· Director
Gift (G)
-387K
|
Mahoney Michael F. | Director | Gift (G) | – | -387K | – | 0 | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Pegus Cheryl
· Director
Buy
+$100K
|
Pegus Cheryl | Director | Buy | $56.49 | +2K | +$100K | 2K | – | May 20, 2026 | May 21, 2026 | |||||||||
|
Ludwig Edward J.
· Director
Buy
+$203K
|
Ludwig Edward J. | Director | Buy | $56.68 | +4K | +$203K | 25K | – | May 20, 2026 | May 21, 2026 | |||||||||
|
Habiger David C.
· Director
Buy
+$126K
|
Habiger David C. | Director | Buy | $55.92 | +2K | +$126K | 14K | – | May 20, 2026 | May 21, 2026 | |||||||||
|
Habiger David C.
· Director
Buy
+$125K
|
Habiger David C. | Director | Buy | $56.95 | +2K | +$125K | 12K | – | May 19, 2026 | May 21, 2026 | |||||||||
|
Zane Ellen M.
· Director
Grant (A)
4K
|
Zane Ellen M. | Director | Grant (A) | – | 4K | – | 28K | – | May 7, 2026 | May 11, 2026 | |||||||||
|
Wichmann David S.
· Director
Grant (A)
4K
|
Wichmann David S. | Director | Grant (A) | – | 4K | – | 45K | – | May 7, 2026 | May 11, 2026 | |||||||||
|
Weber Christophe Pierre
· Director
3 operations
6K
|
Weber Christophe Pierre | Director | 3 operations | – | 6K | – | 3K | – | May 7, 2026 | May 11, 2026 | |||||||||
|
Smith Cathy R.
· Director
2 operations
6K
|
Smith Cathy R. | Director | 2 operations | – | 6K | – | 7K | – | May 7, 2026 | May 11, 2026 | |||||||||
|
Pegus Cheryl
· Director
2 operations
5K
|
Pegus Cheryl | Director | 2 operations | – | 5K | – | 11K | – | May 7, 2026 | May 11, 2026 | |||||||||
|
Morano Susan E.
· Director
2 operations
5K
|
Morano Susan E. | Director | 2 operations | – | 5K | – | 12K | – | May 7, 2026 | May 11, 2026 | |||||||||
|
Mega Jessica L.
· Director
Grant (A)
4K
|
Mega Jessica L. | Director | Grant (A) | – | 4K | – | 12K | – | May 7, 2026 | May 11, 2026 | |||||||||
|
Habiger David C.
· Director
Grant (A)
4K
|
Habiger David C. | Director | Grant (A) | – | 4K | – | 9K | – | May 7, 2026 | May 11, 2026 | |||||||||
N
A
M
G
A
A
1,758 reporting institutions disclosed BSX 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.