Rtw Investments, LP
· Added
Change
+643K
Date
Q1 2026
CS
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Rtw Investments, LP
· Added
Change
+643K
Date
Q1 2026
|
Rtw Investments, LP | Added· Q1 2026 | – | +643K | – | Q1 2026 | |||||
|
Portolan Capital Management, LLC
· Reduced
Change
−379K
Date
Q1 2026
|
Portolan Capital Management, LLC | Reduced· Q1 2026 | – | −379K | – | Q1 2026 | |||||
|
Qube Research & Technologies Ltd
· Added
Change
+324K
Date
Q1 2026
|
Qube Research & Technologies Ltd | Added· Q1 2026 | – | +324K | – | Q1 2026 | |||||
|
Citadel Advisors LLC
· Reduced
Change
−245K
Δ Own
−67.0%
Date
Q1 2026
|
Citadel Advisors LLC | Reduced· Q1 2026 | – | −245K | −67.0% | Q1 2026 | |||||
|
Morgan Stanley
· Added
Change
+225K
Date
Q1 2026
|
Morgan Stanley | Added· Q1 2026 | – | +225K | – | Q1 2026 | |||||
|
SG Americas Securities, LLC
· Added
Change
+224K
Date
Q1 2026
|
SG Americas Securities, LLC | Added· Q1 2026 | – | +224K | – | Q1 2026 | |||||
|
Wellington Management Group LLP
· Exited
Change
−219K
Δ Own
−100.0%
Date
Q1 2026
|
Wellington Management Group LLP | Exited· Q1 2026 | – | −219K | −100.0% | Q1 2026 | |||||
|
Bank of America Corp
· Reduced
Change
−195K
Date
Q1 2026
|
Bank of America Corp | Reduced· Q1 2026 | – | −195K | – | Q1 2026 | |||||
|
Schroder Investment Management Group
· Reduced
Change
−193K
Date
Q1 2026
|
Schroder Investment Management Group | Reduced· Q1 2026 | – | −193K | – | Q1 2026 | |||||
|
Allianz Asset Management GMBH
· Added
Change
+189K
Date
Q1 2026
|
Allianz Asset Management GMBH | Added· Q1 2026 | – | +189K | – | Q1 2026 | |||||
|
Braidwell LP
· Exited
Change
−177K
Δ Own
−100.0%
Date
Q1 2026
|
Braidwell LP | Exited· Q1 2026 | – | −177K | −100.0% | Q1 2026 | |||||
|
Panagora Asset Management Inc
· Added
Change
+176K
Date
Q1 2026
|
Panagora Asset Management Inc | Added· Q1 2026 | – | +176K | – | Q1 2026 | |||||
|
Two Sigma Investments, LP
· Added
Change
+165K
Δ Own
+196.0%
Date
Q1 2026
|
Two Sigma Investments, LP | Added· Q1 2026 | – | +165K | +196.0% | Q1 2026 | |||||
|
Campbell & Co Investment Adviser LLC
· New
Change
+149K
Date
Q1 2026
|
Campbell & Co Investment Adviser LLC | New· Q1 2026 | – | +149K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Reduced
Change
−126K
Date
Q1 2026
|
Jane Street Group, LLC | Reduced· Q1 2026 | – | −126K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Maetzold Derek J.
· Director
7 operations
−$96K
|
Maetzold Derek J. | Director | 7 operations | $22.92 | −4K | −$96K | 12K | – | Jul 14, 2026 | Jul 16, 2026 | |||||||||
|
Maetzold Derek J.
· Director
2 operations
0
|
Maetzold Derek J. | Director | 2 operations | $2.39 | 0 | – | 85K | – | Jul 14, 2026 | Jul 16, 2026 | |||||||||
|
Maetzold Derek J.
· Director
7 operations
−$239K
|
Maetzold Derek J. | Director | 7 operations | $24.29 | −10K | −$239K | 12K | – | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Maetzold Derek J.
· Director
2 operations
0
|
Maetzold Derek J. | Director | 2 operations | $2.39 | 0 | – | 86K | – | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Oelschlager Kristen M.
· Officer
2 operations
−$210K
|
Oelschlager Kristen M. | Officer | 2 operations | $24.40–$24.78 | −9K | −$210K | 22K | −28.2% | Jul 1, 2026 | Jul 6, 2026 | |||||||||
|
Oelschlager Kristen M.
· Officer
Sell
−$178K
|
Oelschlager Kristen M. | Officer | Sell | $20.71 | −9K | −$178K | 30K | – | Jun 16, 2026 | Jun 18, 2026 | |||||||||
|
Maetzold Derek J.
· Director
7 operations
−$86K
|
Maetzold Derek J. | Director | 7 operations | $20.66 | −4K | −$86K | 13K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Maetzold Derek J.
· Director
2 operations
0
|
Maetzold Derek J. | Director | 2 operations | $2.39 | 0 | – | 92K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Maetzold Derek J.
· Director
7 operations
−$205K
|
Maetzold Derek J. | Director | 7 operations | $20.86 | −10K | −$205K | 2K | – | Jun 1, 2026 | Jun 3, 2026 | |||||||||
|
Maetzold Derek J.
· Director
4 operations
0
|
Maetzold Derek J. | Director | 4 operations | $2.39 | 0 | – | 92K | – | Jun 1, 2026 | Jun 3, 2026 | |||||||||
|
Olson Tiffany
· Director
Grant (A)
12K
|
Olson Tiffany | Director | Grant (A) | – | 12K | – | 12K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Goldberg Ellen
· Director
Grant (A)
12K
|
Goldberg Ellen | Director | Grant (A) | – | 12K | – | 12K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Harrison Miles
· Director
Grant (A)
12K
|
Harrison Miles | Director | Grant (A) | – | 12K | – | 12K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Cotton Rodney
· Director
Grant (A)
12K
|
Cotton Rodney | Director | Grant (A) | – | 12K | – | 12K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Caple Kim
· Director
Grant (A)
12K
|
Caple Kim | Director | Grant (A) | – | 12K | – | 12K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
N
A
M
M
G
A
189 reporting institutions disclosed CSTL 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.