Vivo Capital, LLC
· New
Change
+3.2M
Date
Q1 2026
AN
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Vivo Capital, LLC
· New
Change
+3.2M
Date
Q1 2026
|
Vivo Capital, LLC | New· Q1 2026 | – | +3.2M | – | Q1 2026 | |||||
|
Commodore Capital LP
· New
Change
+2.3M
Date
Q1 2026
|
Commodore Capital LP | New· Q1 2026 | – | +2.3M | – | Q1 2026 | |||||
|
Millennium Management LLC
· Added
Change
+2.1M
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +2.1M | – | Q1 2026 | |||||
|
Spruce Street Capital LP
· New
Change
+1.7M
Date
Q1 2026
|
Spruce Street Capital LP | New· Q1 2026 | – | +1.7M | – | Q1 2026 | |||||
|
Adage Capital Partners Gp, L.L.C.
· New
Change
+1.0M
Date
Q1 2026
|
Adage Capital Partners Gp, L.L.C. | New· Q1 2026 | – | +1.0M | – | Q1 2026 | |||||
|
Woodline Partners LP
· Added
Change
+848K
Date
Q1 2026
|
Woodline Partners LP | Added· Q1 2026 | – | +848K | – | Q1 2026 | |||||
|
Boxer Capital Management, LLC
· New
Change
+749K
Date
Q1 2026
|
Boxer Capital Management, LLC | New· Q1 2026 | – | +749K | – | Q1 2026 | |||||
|
Pfizer Inc
· Exited
Change
−715K
Δ Own
−100.0%
Date
Q1 2026
|
Pfizer Inc | Exited· Q1 2026 | – | −715K | −100.0% | Q1 2026 | |||||
|
Ameriprise Financial Inc
· New
Change
+696K
Date
Q1 2026
|
Ameriprise Financial Inc | New· Q1 2026 | – | +696K | – | Q1 2026 | |||||
|
Sio Capital Management, LLC
· New
Change
+657K
Date
Q1 2026
|
Sio Capital Management, LLC | New· Q1 2026 | – | +657K | – | Q1 2026 | |||||
|
Peapod Lane Capital LLC
· Reduced
Change
−534K
Date
Q1 2026
|
Peapod Lane Capital LLC | Reduced· Q1 2026 | – | −534K | – | Q1 2026 | |||||
|
Ally Bridge Group (ny) LLC
· New
Change
+526K
Date
Q1 2026
|
Ally Bridge Group (ny) LLC | New· Q1 2026 | – | +526K | – | Q1 2026 | |||||
|
Prosight Management, LP
· New
Change
+516K
Date
Q1 2026
|
Prosight Management, LP | New· Q1 2026 | – | +516K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Added
Change
+286K
Date
Q1 2026
|
Jane Street Group, LLC | Added· Q1 2026 | – | +286K | – | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
Change
−265K
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | – | −265K | −100.0% | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Aziz Kabeer
· Director
Grant (A)
3K
|
Aziz Kabeer | Director | Grant (A) | – | 3K | – | 59K | +5.1% | Jul 10, 2026 | Jul 10, 2026 | |||||||||
|
Marks Gilbert Lynn
· Director
Grant (A)
3K
|
Marks Gilbert Lynn | Director | Grant (A) | – | 3K | – | 82K | +3.5% | Jul 10, 2026 | Jul 10, 2026 | |||||||||
|
Martin Patricia A.
· Director
Grant (A)
766
|
Martin Patricia A. | Director | Grant (A) | – | 766 | – | 19K | +4.2% | Jul 10, 2026 | Jul 10, 2026 | |||||||||
|
Eizen Joshua M.
· Officer
Sell
−$25K
|
Eizen Joshua M. | Officer | Sell | $4.17 | −6K | −$25K | 207K | −2.8% | Jul 8, 2026 | Jul 10, 2026 | |||||||||
|
Williams Sarah Joanne
· Officer
Sell
−$1K
|
Williams Sarah Joanne | Officer | Sell | $4.43 | −265 | −$1K | 67K | – | May 29, 2026 | Jun 2, 2026 | |||||||||
|
Aziz Kabeer
· Director
Grant (A)
4K
|
Aziz Kabeer | Director | Grant (A) | – | 4K | – | 56K | – | Apr 10, 2026 | Apr 10, 2026 | |||||||||
|
Marks Gilbert Lynn
· Director
Grant (A)
4K
|
Marks Gilbert Lynn | Director | Grant (A) | – | 4K | – | 79K | – | Apr 10, 2026 | Apr 10, 2026 | |||||||||
|
Martin Patricia A.
· Director
Grant (A)
1K
|
Martin Patricia A. | Director | Grant (A) | – | 1K | – | 18K | – | Apr 10, 2026 | Apr 10, 2026 | |||||||||
|
Day Lucy
· Officer
3 operations
-222K
|
Day Lucy | Officer | 3 operations | – | -222K | – | 0 | – | Mar 19, 2026 | Mar 23, 2026 | |||||||||
|
Day Lucy
· Officer
3 operations
222K
|
Day Lucy | Officer | 3 operations | – | 222K | – | 74K | – | Mar 19, 2026 | Mar 23, 2026 | |||||||||
|
Chanda Sanjay
· Officer
3 operations
-166K
|
Chanda Sanjay | Officer | 3 operations | – | -166K | – | 0 | – | Mar 19, 2026 | Mar 23, 2026 | |||||||||
|
Chanda Sanjay
· Officer
3 operations
166K
|
Chanda Sanjay | Officer | 3 operations | – | 166K | – | 66K | – | Mar 19, 2026 | Mar 23, 2026 | |||||||||
|
Marks Gilbert Lynn
· Director
3 operations
-45K
|
Marks Gilbert Lynn | Director | 3 operations | – | -45K | – | 0 | – | Mar 19, 2026 | Mar 23, 2026 | |||||||||
|
Marks Gilbert Lynn
· Director
3 operations
45K
|
Marks Gilbert Lynn | Director | 3 operations | – | 45K | – | 24K | – | Mar 19, 2026 | Mar 23, 2026 | |||||||||
|
Aziz Kabeer
· Director
2 operations
-44K
|
Aziz Kabeer | Director | 2 operations | – | -44K | – | 0 | – | Mar 19, 2026 | Mar 23, 2026 | |||||||||
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53 reporting institutions disclosed ANTX 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.