Madison Avenue Partners, LP
· Reduced
−$171M
Change
−1.9M
Date
Q1 2026
GM
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Madison Avenue Partners, LP
· Reduced
−$171M
Change
−1.9M
Date
Q1 2026
|
Madison Avenue Partners, LP | Reduced· Q1 2026 | −$171M | −1.9M | – | Q1 2026 | |||||
|
Millennium Management LLC
· Added
+$127M
Change
+1.4M
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | +$127M | +1.4M | – | Q1 2026 | |||||
|
Bank of Montreal
· Reduced
−$96M
Change
−1.1M
Date
Q1 2026
|
Bank of Montreal | Reduced· Q1 2026 | −$96M | −1.1M | – | Q1 2026 | |||||
|
Norges
· Exited
−$92M
Change
−1.0M
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | −$92M | −1.0M | −100.0% | Q1 2026 | |||||
|
Parsifal Capital Management, LP
· Reduced
−$75M
Change
−836K
Date
Q1 2026
|
Parsifal Capital Management, LP | Reduced· Q1 2026 | −$75M | −836K | – | Q1 2026 | |||||
|
Walleye Capital LLC
· Reduced
−$74M
Change
−819K
Date
Q1 2026
|
Walleye Capital LLC | Reduced· Q1 2026 | −$74M | −819K | – | Q1 2026 | |||||
|
Holocene Advisors, LP
· New
+$69M
Change
+774K
Date
Q1 2026
|
Holocene Advisors, LP | New· Q1 2026 | +$69M | +774K | – | Q1 2026 | |||||
|
AQR Capital Management LLC
· Added
+$65M
Change
+729K
Date
Q1 2026
|
AQR Capital Management LLC | Added· Q1 2026 | +$65M | +729K | – | Q1 2026 | |||||
|
Vestal Point Capital, LP
· Reduced
−$60M
Change
−664K
Date
Q1 2026
|
Vestal Point Capital, LP | Reduced· Q1 2026 | −$60M | −664K | – | Q1 2026 | |||||
|
Citadel Advisors LLC
· Reduced
−$51M
Change
−573K
Δ Own
−22.6%
Date
Q1 2026
|
Citadel Advisors LLC | Reduced· Q1 2026 | −$51M | −573K | −22.6% | Q1 2026 | |||||
|
FMR LLC
· Added
+$49M
Change
+551K
Δ Own
+1121.3%
Date
Q1 2026
|
FMR LLC | Added· Q1 2026 | +$49M | +551K | +1121.3% | Q1 2026 | |||||
|
William Blair Investment Management, LLC
· Reduced
−$46M
Change
−510K
Date
Q1 2026
|
William Blair Investment Management, LLC | Reduced· Q1 2026 | −$46M | −510K | – | Q1 2026 | |||||
|
JPMorgan Chase & Co
· Reduced
−$45M
Change
−503K
Date
Q1 2026
|
JPMorgan Chase & Co | Reduced· Q1 2026 | −$45M | −503K | – | Q1 2026 | |||||
|
Hawk Ridge Capital Management LP
· New
+$45M
Change
+500K
Date
Q1 2026
|
Hawk Ridge Capital Management LP | New· Q1 2026 | +$45M | +500K | – | Q1 2026 | |||||
|
Arrowstreet Capital, Limited Partnership
· Added
+$42M
Change
+472K
Date
Q1 2026
|
Arrowstreet Capital, Limited Partnership | Added· Q1 2026 | +$42M | +472K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Davidar David D.
· Director
Gift (G)
-2K
|
Davidar David D. | Director | Gift (G) | – | -2K | – | 508K | −0.5% | Jul 27, 2026 | Jul 28, 2026 | |||||||||
|
Davidar David D.
· Director
Sell
−$2.0M
|
Davidar David D. | Director | Sell | $80.76 | −25K | −$2.0M | 510K | – | Jun 5, 2026 | Jun 9, 2026 | |||||||||
|
Davidar David D.
· Director
2 operations
0
|
Davidar David D. | Director | 2 operations | $26.27 | 0 | – | 0 | – | Jun 5, 2026 | Jun 9, 2026 | |||||||||
|
Rhoads Ann D.
· Director
2 operations
0
|
Rhoads Ann D. | Director | 2 operations | $26.27 | 0 | – | 0 | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Huller Kelly
· Officer
Sell
−$1.9M
|
Huller Kelly | Officer | Sell | $94.50 | −20K | −$1.9M | 0 | – | Feb 25, 2026 | Feb 27, 2026 | |||||||||
|
Huller Kelly
· Officer
2 operations
0
|
Huller Kelly | Officer | 2 operations | $43.58 | 0 | – | 20K | – | Feb 25, 2026 | Feb 27, 2026 | |||||||||
|
Huller Kelly
· Officer
Sell
−$877K
|
Huller Kelly | Officer | Sell | $87.67 | −10K | −$877K | 0 | – | Feb 12, 2026 | Feb 17, 2026 | |||||||||
|
Huller Kelly
· Officer
2 operations
0
|
Huller Kelly | Officer | 2 operations | $45.64 | 0 | – | 0 | – | Feb 12, 2026 | Feb 17, 2026 | |||||||||
|
Norwalk Leslie V
· Director
Grant (A)
15K
|
Norwalk Leslie V | Director | Grant (A) | – | 15K | – | 15K | – | Jan 21, 2026 | Jan 23, 2026 | |||||||||
|
Pfeil Keith W.
· Director, Officer
Grant (A)
100K
|
Pfeil Keith W. | Director, Officer | Grant (A) | – | 100K | – | 100K | – | Jan 21, 2026 | Jan 23, 2026 | |||||||||
|
Kline Kyle
· Officer
Grant (A)
30K
|
Kline Kyle | Officer | Grant (A) | – | 30K | – | 30K | – | Jan 21, 2026 | Jan 23, 2026 | |||||||||
|
Paul David C.
· Director, Officer, 10% Owner
Grant (A)
100K
|
Paul David C. | Director, Officer, 10% Owner | Grant (A) | – | 100K | – | 100K | – | Jan 21, 2026 | Jan 23, 2026 | |||||||||
|
Douglas Robert Andrew
· Director
Grant (A)
15K
|
Douglas Robert Andrew | Director | Grant (A) | – | 15K | – | 15K | – | Jan 21, 2026 | Jan 23, 2026 | |||||||||
|
Lemaitre Dan
· Director
Grant (A)
15K
|
Lemaitre Dan | Director | Grant (A) | – | 15K | – | 15K | – | Jan 21, 2026 | Jan 23, 2026 | |||||||||
|
Rhoads Ann D.
· Director
Grant (A)
15K
|
Rhoads Ann D. | Director | Grant (A) | – | 15K | – | 15K | – | Jan 21, 2026 | Jan 23, 2026 | |||||||||
M
G
A
A
N
A
557 reporting institutions disclosed GMED 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.