FMR LLC
· Reduced
−$1.9B
Change
−23.2M
Δ Own
−23.8%
Date
Q1 2026
BS
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
FMR LLC
· Reduced
−$1.9B
Change
−23.2M
Δ Own
−23.8%
Date
Q1 2026
|
FMR LLC | Reduced· Q1 2026 | −$1.9B | −23.2M | −23.8% | Q1 2026 | |||||
|
Norges
· Exited
−$1.8B
Change
−23.1M
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | −$1.8B | −23.1M | −100.0% | Q1 2026 | |||||
|
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 | |||||
|
Capital World Investors
· Reduced
−$947M
Change
−11.8M
Date
Q1 2026
|
Capital World Investors | Reduced· Q1 2026 | −$947M | −11.8M | – | 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 | |||||
|
Fisher Asset Management, LLC
· Reduced
−$695M
Change
−8.7M
Δ Own
−95.1%
Date
Q1 2026
|
Fisher Asset Management, LLC | Reduced· Q1 2026 | −$695M | −8.7M | −95.1% | 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 | |||||
|
Millennium Management LLC
· Reduced
−$554M
Change
−6.9M
Date
Q1 2026
|
Millennium Management LLC | Reduced· Q1 2026 | −$554M | −6.9M | – | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
−$504M
Change
−6.3M
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | −$504M | −6.3M | −100.0% | 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 | |||||
|
Egerton Capital (uk) LLP
· Exited
−$431M
Change
−5.4M
Δ Own
−100.0%
Date
Q1 2026
|
Egerton Capital (uk) LLP | Exited· Q1 2026 | −$431M | −5.4M | −100.0% | Q1 2026 | |||||
|
Dz Bank AG Deutsche Zentral Genossenschafts Bank, Frankfurt AM Main
· Reduced
−$425M
Change
−5.3M
Date
Q1 2026
|
Dz Bank AG Deutsche Zentral Genossenschafts Bank, Frankfurt AM Main | Reduced· Q1 2026 | −$425M | −5.3M | – | 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 | |||||
|
Jennison Associates LLC
· Reduced
−$366M
Change
−4.6M
Date
Q1 2026
|
Jennison Associates LLC | Reduced· Q1 2026 | −$366M | −4.6M | – | 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.