Propel Bio Management, LLC
· New
Change
+897K
Date
Q1 2026
OB
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Propel Bio Management, LLC
· New
Change
+897K
Date
Q1 2026
|
Propel Bio Management, LLC | New· Q1 2026 | – | +897K | – | Q1 2026 | |||||
|
Vanguard
· Added
Change
+849K
Date
Q1 2026
|
Vanguard | Added· Q1 2026 | – | +849K | – | Q1 2026 | |||||
|
Millennium Management LLC
· Added
Change
+459K
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +459K | – | Q1 2026 | |||||
|
T. Rowe Price Associates
· Exited
Change
−365K
Δ Own
−100.0%
Date
Q1 2026
|
T. Rowe Price Associates | Exited· Q1 2026 | – | −365K | −100.0% | Q1 2026 | |||||
|
Simplify Asset Management Inc.
· New
Change
+219K
Date
Q1 2026
|
Simplify Asset Management Inc. | New· Q1 2026 | – | +219K | – | Q1 2026 | |||||
|
Affinity Asset Advisors, LLC
· Reduced
Change
−170K
Date
Q1 2026
|
Affinity Asset Advisors, LLC | Reduced· Q1 2026 | – | −170K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Reduced
Change
−118K
Date
Q1 2026
|
Jane Street Group, LLC | Reduced· Q1 2026 | – | −118K | – | Q1 2026 | |||||
|
Exoduspoint Capital Management, LP
· Exited
Change
−96K
Δ Own
−100.0%
Date
Q1 2026
|
Exoduspoint Capital Management, LP | Exited· Q1 2026 | – | −96K | −100.0% | Q1 2026 | |||||
|
Perceptive Advisors LLC
· Reduced
Change
−89K
Date
Q1 2026
|
Perceptive Advisors LLC | Reduced· Q1 2026 | – | −89K | – | Q1 2026 | |||||
|
Renaissance Technologies LLC
· Reduced
Change
−80K
Δ Own
−53.1%
Date
Q1 2026
|
Renaissance Technologies LLC | Reduced· Q1 2026 | – | −80K | −53.1% | Q1 2026 | |||||
|
Point72 Asset Management, L.P.
· Reduced
Change
−74K
Δ Own
−45.7%
Date
Q1 2026
|
Point72 Asset Management, L.P. | Reduced· Q1 2026 | – | −74K | −45.7% | Q1 2026 | |||||
|
Susquehanna International Group, LLP
· Reduced
Change
−58K
Date
Q1 2026
|
Susquehanna International Group, LLP | Reduced· Q1 2026 | – | −58K | – | Q1 2026 | |||||
|
Omers Administration Corp
· Reduced
Change
−51K
Date
Q1 2026
|
Omers Administration Corp | Reduced· Q1 2026 | – | −51K | – | Q1 2026 | |||||
|
Xtx Topco Ltd
· Exited
Change
−50K
Δ Own
−100.0%
Date
Q1 2026
|
Xtx Topco Ltd | Exited· Q1 2026 | – | −50K | −100.0% | Q1 2026 | |||||
|
Citadel Advisors LLC
· Added
Change
+49K
Δ Own
+162.4%
Date
Q1 2026
|
Citadel Advisors LLC | Added· Q1 2026 | – | +49K | +162.4% | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sherman Darren
· Director
Sell
−$64K
|
Sherman Darren | Director | Sell | $4.27 | −15K | −$64K | 1.2M | −1.3% | Jul 1, 2026 | Jul 2, 2026 | |||||||||
|
Fain Eric S.
· Director
Tax withholding or exercise payment (F)
-4K
|
Fain Eric S. | Director | Tax withholding or exercise payment (F) | – | -4K | – | 105K | −3.9% | Jun 24, 2026 | Jun 25, 2026 | |||||||||
|
Pacitti David
· Director
Tax withholding or exercise payment (F)
-4K
|
Pacitti David | Director | Tax withholding or exercise payment (F) | – | -4K | – | 59K | −6.1% | Jun 24, 2026 | Jun 25, 2026 | |||||||||
|
Cleary Chris
· Director
Tax withholding or exercise payment (F)
-4K
|
Cleary Chris | Director | Tax withholding or exercise payment (F) | – | -4K | – | 33K | −9.5% | Jun 24, 2026 | Jun 25, 2026 | |||||||||
|
Mack John Prosper
· Director
Tax withholding or exercise payment (F)
-4K
|
Mack John Prosper | Director | Tax withholding or exercise payment (F) | – | -4K | – | 71K | −4.7% | Jun 24, 2026 | Jun 25, 2026 | |||||||||
|
Fain Eric S.
· Director
2 operations
39K
|
Fain Eric S. | Director | 2 operations | – | 39K | – | 21K | – | Jun 23, 2026 | Jun 25, 2026 | |||||||||
|
Pacitti David
· Director
2 operations
39K
|
Pacitti David | Director | 2 operations | – | 39K | – | 21K | – | Jun 23, 2026 | Jun 25, 2026 | |||||||||
|
Cleary Chris
· Director
Grant (A)
43K
|
Cleary Chris | Director | Grant (A) | – | 43K | – | 43K | – | Jun 23, 2026 | Jun 25, 2026 | |||||||||
|
Connealy Pamela Ann
· Director
2 operations
39K
|
Connealy Pamela Ann | Director | 2 operations | – | 39K | – | 21K | – | Jun 23, 2026 | Jun 25, 2026 | |||||||||
|
Aryeh Jason
· Director
Grant (A)
43K
|
Aryeh Jason | Director | Grant (A) | – | 43K | – | 43K | – | Jun 23, 2026 | Jun 25, 2026 | |||||||||
|
Mack John Prosper
· Director
Grant (A)
35K
|
Mack John Prosper | Director | Grant (A) | – | 35K | – | 75K | +86.0% | Jun 23, 2026 | Jun 25, 2026 | |||||||||
|
Taylor Andrew Lawrence
· CFO
Tax withholding or exercise payment (F)
-$146K
|
Taylor Andrew Lawrence | CFO | Tax withholding or exercise payment (F) | $4.02 | -36K | -$146K | 593K | – | Jun 10, 2026 | Jun 12, 2026 | |||||||||
|
Hochman David P.
· Director
2 operations
-$26K
|
Hochman David P. | Director | 2 operations | $4.02 | -7K | -$26K | 436K | – | Jun 10, 2026 | Jun 12, 2026 | |||||||||
|
Hochman David P.
· Director
Buy
+$19K
|
Hochman David P. | Director | Buy | $3.83 | +5K | +$19K | 1.1M | – | Jun 1, 2026 | Jun 2, 2026 | |||||||||
|
Sherman Darren
· Director
Sell
−$58K
|
Sherman Darren | Director | Sell | $3.87 | −15K | −$58K | 1.2M | – | Jun 1, 2026 | Jun 2, 2026 | |||||||||
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70 reporting institutions disclosed OBIO 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.