Balyasny Asset Management L.P.
· Added
Change
+1.4M
Date
Q1 2026
CB
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Balyasny Asset Management L.P.
· Added
Change
+1.4M
Date
Q1 2026
|
Balyasny Asset Management L.P. | Added· Q1 2026 | – | +1.4M | – | Q1 2026 | |||||
|
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 | |||||
|
Tang Capital Management LLC
· Added
Change
+288K
Date
Q1 2026
|
Tang Capital Management LLC | Added· Q1 2026 | – | +288K | – | 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 | |||||
|
Millennium Management LLC
· Added
Change
+262K
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +262K | – | Q1 2026 | |||||
|
Perceptive Advisors LLC
· Reduced
Change
−247K
Date
Q1 2026
|
Perceptive Advisors LLC | Reduced· Q1 2026 | – | −247K | – | Q1 2026 | |||||
|
Goldman Sachs Group Inc
· Added
Change
+203K
Date
Q1 2026
|
Goldman Sachs Group Inc | Added· Q1 2026 | – | +203K | – | Q1 2026 | |||||
|
Marshall Wace, LLP
· Added
Change
+179K
Date
Q1 2026
|
Marshall Wace, LLP | Added· Q1 2026 | – | +179K | – | Q1 2026 | |||||
|
Susquehanna International Group, LLP
· Added
Change
+157K
Date
Q1 2026
|
Susquehanna International Group, LLP | Added· Q1 2026 | – | +157K | – | Q1 2026 | |||||
|
Exome Asset Management LLC
· New
Change
+153K
Date
Q1 2026
|
Exome Asset Management LLC | New· Q1 2026 | – | +153K | – | Q1 2026 | |||||
|
Jennison Associates LLC
· New
Change
+153K
Date
Q1 2026
|
Jennison Associates LLC | New· Q1 2026 | – | +153K | – | 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 | |||||
| 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 | |||||||||
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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.