Vanguard
· Reduced
Change
−905K
Date
Q1 2026
CB
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Vanguard
· Reduced
Change
−905K
Date
Q1 2026
|
Vanguard | Reduced· Q1 2026 | – | −905K | – | Q1 2026 | |||||
|
Adar1 Capital Management, LLC
· Reduced
Change
−556K
Date
Q1 2026
|
Adar1 Capital Management, LLC | Reduced· Q1 2026 | – | −556K | – | Q1 2026 | |||||
|
Boxer Capital Management, LLC
· Exited
Change
−454K
Δ Own
−100.0%
Date
Q1 2026
|
Boxer Capital Management, LLC | Exited· Q1 2026 | – | −454K | −100.0% | Q1 2026 | |||||
|
Driehaus Capital Management LLC
· Exited
Change
−302K
Δ Own
−100.0%
Date
Q1 2026
|
Driehaus Capital Management LLC | Exited· Q1 2026 | – | −302K | −100.0% | Q1 2026 | |||||
|
Heights Capital Management, Inc
· Exited
Change
−264K
Δ Own
−100.0%
Date
Q1 2026
|
Heights Capital Management, Inc | Exited· Q1 2026 | – | −264K | −100.0% | Q1 2026 | |||||
|
Perceptive Advisors LLC
· Reduced
Change
−247K
Date
Q1 2026
|
Perceptive Advisors LLC | Reduced· Q1 2026 | – | −247K | – | Q1 2026 | |||||
|
Wellington Management Group LLP
· Exited
Change
−143K
Δ Own
−100.0%
Date
Q1 2026
|
Wellington Management Group LLP | Exited· Q1 2026 | – | −143K | −100.0% | Q1 2026 | |||||
|
Logos Global Management LP
· Reduced
Change
−118K
Date
Q1 2026
|
Logos Global Management LP | Reduced· Q1 2026 | – | −118K | – | Q1 2026 | |||||
|
Blackstone Inc.
· Exited
Change
−76K
Δ Own
−100.0%
Date
Q1 2026
|
Blackstone Inc. | Exited· Q1 2026 | – | −76K | −100.0% | Q1 2026 | |||||
|
Jefferies Financial Group Inc.
· Exited
Change
−64K
Δ Own
−100.0%
Date
Q1 2026
|
Jefferies Financial Group Inc. | Exited· Q1 2026 | – | −64K | −100.0% | Q1 2026 | |||||
|
T. Rowe Price Associates
· Reduced
Change
−35K
Date
Q1 2026
|
T. Rowe Price Associates | Reduced· Q1 2026 | – | −35K | – | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
Change
−32K
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | – | −32K | −100.0% | Q1 2026 | |||||
|
Jane Street Group, LLC
· Exited
Change
−23K
Δ Own
−100.0%
Date
Q1 2026
|
Jane Street Group, LLC | Exited· Q1 2026 | – | −23K | −100.0% | Q1 2026 | |||||
|
Renaissance Technologies LLC
· Reduced
Change
−22K
Δ Own
−48.0%
Date
Q1 2026
|
Renaissance Technologies LLC | Reduced· Q1 2026 | – | −22K | −48.0% | Q1 2026 | |||||
|
Hrt Financial LP
· Exited
Change
−13K
Δ Own
−100.0%
Date
Q1 2026
|
Hrt Financial LP | Exited· Q1 2026 | – | −13K | −100.0% | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Fairmount Funds Management LLC
· Director
Buy
+$12M
|
Fairmount Funds Management LLC | Director | Buy | $14.50 | +853K | +$12M | 3.6M | +31.1% | Jul 16, 2026 | Jul 20, 2026 | |||||||||
|
Fairmount Funds Management LLC
· Director
Other Form 4 event (P, derivative)
$7.6M
|
Fairmount Funds Management LLC | Director | Other Form 4 event (P, derivative) | $14.50 | 526K | $7.6M | 2.3M | – | Jul 16, 2026 | Jul 20, 2026 | |||||||||
|
Lynch Ryan
· Officer
Sell
−$8K
|
Lynch Ryan | Officer | Sell | $17.99 | −465 | −$8K | 14K | −3.2% | Jun 22, 2026 | Jun 23, 2026 | |||||||||
|
Pinkas Jan
· Officer
Sell
−$23K
|
Pinkas Jan | Officer | Sell | $17.99 | −1K | −$23K | 22K | −5.5% | Jun 22, 2026 | Jun 23, 2026 | |||||||||
|
Scalzo Richard William
· Officer
Sell
−$20K
|
Scalzo Richard William | Officer | Sell | $17.99 | −1K | −$20K | 20K | −5.2% | Jun 22, 2026 | Jun 23, 2026 | |||||||||
|
Bispham Barbara Harlin
· Officer
Sell
−$22K
|
Bispham Barbara Harlin | Officer | Sell | $17.99 | −1K | −$22K | 19K | −5.9% | Jun 22, 2026 | Jun 23, 2026 | |||||||||
|
IM Ellie Eunkyung
· Officer
Sell
−$22K
|
IM Ellie Eunkyung | Officer | Sell | $17.99 | −1K | −$22K | 22K | −5.2% | Jun 22, 2026 | Jun 23, 2026 | |||||||||
|
McNeill Jonathan
· Officer
Sell
−$370K
|
McNeill Jonathan | Officer | Sell | $17.99 | −21K | −$370K | 139K | −12.9% | Jun 22, 2026 | Jun 23, 2026 | |||||||||
|
Brumm Joshua T.
· Director
Sell
−$761K
|
Brumm Joshua T. | Director | Sell | $17.99 | −42K | −$761K | 281K | −13.1% | Jun 22, 2026 | Jun 23, 2026 | |||||||||
|
Violin Jonathan
· Director
Grant (A)
11K
|
Violin Jonathan | Director | Grant (A) | – | 11K | – | 11K | – | Jun 2, 2026 | Jun 3, 2026 | |||||||||
|
Lubner David Charles
· Director
Grant (A)
11K
|
Lubner David Charles | Director | Grant (A) | – | 11K | – | 11K | – | Jun 2, 2026 | Jun 3, 2026 | |||||||||
|
Balcom Alexandra
· Director
Grant (A)
11K
|
Balcom Alexandra | Director | Grant (A) | – | 11K | – | 11K | – | Jun 2, 2026 | Jun 3, 2026 | |||||||||
|
Moran Susan
· Director
Grant (A)
11K
|
Moran Susan | Director | Grant (A) | – | 11K | – | 11K | – | Jun 2, 2026 | Jun 3, 2026 | |||||||||
|
Fairmount Funds Management LLC
· Director
Grant (A)
11K
|
Fairmount Funds Management LLC | Director | Grant (A) | – | 11K | – | 11K | – | Jun 2, 2026 | Jun 3, 2026 | |||||||||
|
Pinkas Jan
· Officer
3 operations
93K
|
Pinkas Jan | Officer | 3 operations | – | 93K | – | 70K | – | Dec 15, 2025 | Dec 17, 2025 | |||||||||
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53 reporting institutions disclosed CBIO 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.