683 Capital Management, LLC
· New
Change
+900K
Date
Q1 2026
CN
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
683 Capital Management, LLC
· New
Change
+900K
Date
Q1 2026
|
683 Capital Management, LLC | New· Q1 2026 | – | +900K | – | Q1 2026 | |||||
|
Adar1 Capital Management, LLC
· New
Change
+742K
Date
Q1 2026
|
Adar1 Capital Management, LLC | New· Q1 2026 | – | +742K | – | Q1 2026 | |||||
|
Ikarian Capital, LLC
· Added
Change
+600K
Date
Q1 2026
|
Ikarian Capital, LLC | Added· Q1 2026 | – | +600K | – | Q1 2026 | |||||
|
Millennium Management LLC
· Added
Change
+428K
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +428K | – | Q1 2026 | |||||
|
Stonepine Capital Management, LLC
· New
Change
+310K
Date
Q1 2026
|
Stonepine Capital Management, LLC | New· Q1 2026 | – | +310K | – | Q1 2026 | |||||
|
Richmond Brothers, Inc.
· Added
Change
+303K
Date
Q1 2026
|
Richmond Brothers, Inc. | Added· Q1 2026 | – | +303K | – | Q1 2026 | |||||
|
Propel Bio Management, LLC
· New
Change
+209K
Date
Q1 2026
|
Propel Bio Management, LLC | New· Q1 2026 | – | +209K | – | Q1 2026 | |||||
|
Susquehanna International Group, LLP
· Added
Change
+207K
Date
Q1 2026
|
Susquehanna International Group, LLP | Added· Q1 2026 | – | +207K | – | Q1 2026 | |||||
|
Diadema Partners LP
· New
Change
+201K
Date
Q1 2026
|
Diadema Partners LP | New· Q1 2026 | – | +201K | – | Q1 2026 | |||||
|
Knott David M Jr
· Added
Change
+188K
Date
Q1 2026
|
Knott David M Jr | Added· Q1 2026 | – | +188K | – | Q1 2026 | |||||
|
Burkehill Global Management, LP
· New
Change
+150K
Date
Q1 2026
|
Burkehill Global Management, LP | New· Q1 2026 | – | +150K | – | Q1 2026 | |||||
|
Omers Administration Corp
· Exited
Change
−81K
Δ Own
−100.0%
Date
Q1 2026
|
Omers Administration Corp | Exited· Q1 2026 | – | −81K | −100.0% | Q1 2026 | |||||
|
Marshall Wace, LLP
· Reduced
Change
−62K
Date
Q1 2026
|
Marshall Wace, LLP | Reduced· Q1 2026 | – | −62K | – | Q1 2026 | |||||
|
Simplify Asset Management Inc.
· New
Change
+51K
Date
Q1 2026
|
Simplify Asset Management Inc. | New· Q1 2026 | – | +51K | – | Q1 2026 | |||||
|
Two Sigma Investments, LP
· New
Change
+47K
Date
Q1 2026
|
Two Sigma Investments, LP | New· Q1 2026 | – | +47K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Xanthopoulos Kleanthis Gabriel
· Director
Grant (A)
4K
|
Xanthopoulos Kleanthis Gabriel | Director | Grant (A) | – | 4K | – | 87K | +4.5% | Jun 30, 2026 | Jul 1, 2026 | |||||||||
|
Liu Jean I.
· Director
Grant (A)
7K
|
Liu Jean I. | Director | Grant (A) | – | 7K | – | 12K | +132.7% | Jun 30, 2026 | Jul 1, 2026 | |||||||||
|
Huang James
· Director
Buy
+$372K
|
Huang James | Director | Buy | $2.48 | +150K | +$372K | 13.3M | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Xanthopoulos Kleanthis Gabriel
· Director
Grant (A)
3K
|
Xanthopoulos Kleanthis Gabriel | Director | Grant (A) | – | 3K | – | 83K | – | Mar 31, 2026 | Apr 2, 2026 | |||||||||
|
Liu Jean I.
· Director
Grant (A)
5K
|
Liu Jean I. | Director | Grant (A) | – | 5K | – | 5K | – | Mar 31, 2026 | Apr 2, 2026 | |||||||||
|
Huang James
· Director
Buy
+$4.0M
|
Huang James | Director | Buy | $3.45 | +1.2M | +$4.0M | 13.2M | – | Mar 31, 2026 | Apr 1, 2026 | |||||||||
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33 reporting institutions disclosed CNTB 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.