AnaptysBio Inc
Ownership
Ownership Structure
Who owns AnaptysBio Inc (ANAB)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 68.6% of the shares are freely tradable; institutional investors hold 104.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| EcoR1 Capital, LLC | 26.36 | 7,880,094 | +0.0 | 06/30/2026 |
| BlackRock Inc | 6.17 | 1,844,049 | +9.7 | 06/30/2026 |
| TANG CAPITAL MANAGEMENT LLC | 4.45 | 1,330,879 | +0.0 | 06/30/2026 |
| State Street Corp | 4.30 | 1,286,194 | +29.6 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.03 | 906,233 | +6.2 | 06/30/2026 |
| Affinity Asset Advisors, LLC | 2.76 | 826,109 | -12.1 | 06/30/2026 |
| Sanofi | 2.75 | 821,917 | +0.0 | 06/30/2026 |
| Millennium Management LLC | 2.70 | 807,316 | +69.8 | 06/30/2026 |
| Woodline Partners LP | 2.40 | 717,014 | +108.3 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.17 | 648,146 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Orwin John A | Director | 17,995 | 858,362 $ | Sep 15, 2026 | direct |
| Renton Hollings | Director | 10,995 | 524,462 $ | Oct 1, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 1, 2026 | Renton Hollings | Director | Sell | 5,000 | 49.87 | 249,372 |
| Oct 1, 2026 | Renton Hollings | Director | Other | 5,000 | 18.03 | 90,150 |
| Sep 15, 2026 | Orwin John A | Director | Other | 1,300 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 3, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.