ANAB: ANAPTYSBIO, INC insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 1 sales totaling $249K in the last 180 days.
Insider sales
| Trade date | Insider | Role | Value | 10b5-1 plan |
|---|---|---|---|---|
| 2026-10-01 | Renton Hollings | Director | $249K | yes |
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-14 | 13G amendment | Sirenia Capital Management LP | 5.00% | SEC |
Institutional ownership (Q2 2026)
213 institutions reported holding $2.04B of ANAPTYSBIO, INC on Form 13F (208 the quarter before). 43 opened a new position and 37 sold out. Shares held by institutions: +7%.
| Largest holders | Shares | Value |
|---|---|---|
| EcoR1 Capital, LLC | 7,880,094 | $531.91M |
| BlackRock, Inc. | 1,844,049 | $124.47M |
| TANG CAPITAL MANAGEMENT LLC | 1,330,879 | $89.83M |
| STATE STREET CORP | 1,286,194 | $86.82M |
| VANGUARD CAPITAL MANAGEMENT LLC | 906,233 | $61.17M |
| Affinity Asset Advisors, LLC | 826,109 | $55.76M |
| Sanofi | 821,917 | $55.48M |
| MILLENNIUM MANAGEMENT LLC | 807,316 | $54.49M |
| Woodline Partners LP | 717,014 | $48.40M |
| 683 Capital Management, LLC | 660,000 | $44.55M |
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