Redmile Group, LLC
· Added
Change
+3.8M
Date
Q1 2026
SR
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Redmile Group, LLC
· Added
Change
+3.8M
Date
Q1 2026
|
Redmile Group, LLC | Added· Q1 2026 | – | +3.8M | – | Q1 2026 | |||||
|
Norges
· Exited
Change
−2.1M
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | – | −2.1M | −100.0% | Q1 2026 | |||||
|
FMR LLC
· Added
Change
+1.9M
Δ Own
+12.1%
Date
Q1 2026
|
FMR LLC | Added· Q1 2026 | – | +1.9M | +12.1% | Q1 2026 | |||||
|
Paradigm Biocapital Advisors LP
· Reduced
Change
−1.8M
Date
Q1 2026
|
Paradigm Biocapital Advisors LP | Reduced· Q1 2026 | – | −1.8M | – | Q1 2026 | |||||
|
Wellington Management Group LLP
· Added
Change
+958K
Δ Own
+16.6%
Date
Q1 2026
|
Wellington Management Group LLP | Added· Q1 2026 | – | +958K | +16.6% | Q1 2026 | |||||
|
Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A.
· Exited
Change
−769K
Δ Own
−100.0%
Date
Q1 2026
|
Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. | Exited· Q1 2026 | – | −769K | −100.0% | Q1 2026 | |||||
|
Orbis Allan Gray Ltd
· Added
Change
+751K
Date
Q1 2026
|
Orbis Allan Gray Ltd | Added· Q1 2026 | – | +751K | – | Q1 2026 | |||||
|
Adage Capital Partners Gp, L.L.C.
· New
Change
+700K
Date
Q1 2026
|
Adage Capital Partners Gp, L.L.C. | New· Q1 2026 | – | +700K | – | Q1 2026 | |||||
|
Marshall Wace, LLP
· Added
Change
+692K
Date
Q1 2026
|
Marshall Wace, LLP | Added· Q1 2026 | – | +692K | – | Q1 2026 | |||||
|
Polar Capital Holdings PLC
· Added
Change
+662K
Date
Q1 2026
|
Polar Capital Holdings PLC | Added· Q1 2026 | – | +662K | – | Q1 2026 | |||||
|
Vestal Point Capital, LP
· Added
Change
+624K
Date
Q1 2026
|
Vestal Point Capital, LP | Added· Q1 2026 | – | +624K | – | Q1 2026 | |||||
|
Jennison Associates LLC
· Added
Change
+545K
Date
Q1 2026
|
Jennison Associates LLC | Added· Q1 2026 | – | +545K | – | Q1 2026 | |||||
|
Holocene Advisors, LP
· Added
Change
+504K
Date
Q1 2026
|
Holocene Advisors, LP | Added· Q1 2026 | – | +504K | – | Q1 2026 | |||||
|
Bellevue Group AG
· Reduced
Change
−472K
Date
Q1 2026
|
Bellevue Group AG | Reduced· Q1 2026 | – | −472K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Added
Change
+472K
Date
Q1 2026
|
Jane Street Group, LLC | Added· Q1 2026 | – | +472K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Flier Jeffrey S.
· Director
3 operations
−$164K
|
Flier Jeffrey S. | Director | 3 operations | $53.53–$54.88 | −3K | −$164K | 28K | −9.9% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Gilman Michael
· Director
3 operations
−$137K
|
Gilman Michael | Director | 3 operations | $53.54–$54.81 | −3K | −$137K | 60K | −4.1% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Burow Kristina
· Director
2 operations
−$164K
|
Burow Kristina | Director | 2 operations | $53.49–$54.28 | −3K | −$164K | 115K | −2.6% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Reed Joshua
· Director
2 operations
−$164K
|
Reed Joshua | Director | 2 operations | $53.50–$54.28 | −3K | −$164K | 20K | −13.5% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Peng Katie
· Director
3 operations
−$293K
|
Peng Katie | Director | 3 operations | $53.56–$54.96 | −5K | −$293K | 34K | −13.7% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Flier Jeffrey S.
· Director
2 operations
11K
|
Flier Jeffrey S. | Director | 2 operations | – | 11K | – | 4K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Reed Joshua
· Director
2 operations
11K
|
Reed Joshua | Director | 2 operations | – | 11K | – | 4K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Brudnick Richard
· Director
2 operations
11K
|
Brudnick Richard | Director | 2 operations | – | 11K | – | 4K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Burow Kristina
· Director
2 operations
11K
|
Burow Kristina | Director | 2 operations | – | 11K | – | 4K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Gilman Michael
· Director
2 operations
11K
|
Gilman Michael | Director | 2 operations | – | 11K | – | 4K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Peng Katie
· Director
2 operations
11K
|
Peng Katie | Director | 2 operations | – | 11K | – | 4K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Akkaraju Srinivas
· Director
2 operations
11K
|
Akkaraju Srinivas | Director | 2 operations | – | 11K | – | 4K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Burow Kristina
· Director
8 operations
0
|
Burow Kristina | Director | 8 operations | $4.75–$26.78 | 0 | – | 0 | – | Apr 23, 2026 | Apr 24, 2026 | |||||||||
|
Woods Keith
· Officer
Sell
−$507K
|
Woods Keith | Officer | Sell | $49.57 | −10K | −$507K | 620K | – | Apr 16, 2026 | Apr 20, 2026 | |||||||||
|
Vaishnaw Akshay
· Director
Sell
−$607K
|
Vaishnaw Akshay | Director | Sell | $49.57 | −12K | −$607K | 631K | – | Apr 16, 2026 | Apr 20, 2026 | |||||||||
N
A
M
G
A
A
259 reporting institutions disclosed SRRK 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.