Assembly Biosciences Inc
Ownership
Ownership Structure
Who owns Assembly Biosciences Inc (ASMB)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 45.1% of the shares are freely tradable; institutional investors hold 48.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Farallon Capital Management, L.L.C. | 7.88 | 1,604,590 | +30.7 | 06/30/2026 |
| Paradigm Biocapital Advisors LP | 7.63 | 1,553,748 | +133.6 | 06/30/2026 |
| COMMODORE CAPITAL LP | 6.95 | 1,415,000 | +41.5 | 06/30/2026 |
| RA Capital Management, LLC | 5.01 | 1,020,410 | +0.0 | 06/30/2026 |
| HHG PLC | 4.17 | 849,309 | +1.4 | 03/31/2026 |
| Jupiter Topco LLC | 4.17 | 849,309 | +0.0 | 06/30/2026 |
| BlackRock Inc | 3.77 | 766,819 | +278.2 | 06/30/2026 |
| Parkman Healthcare Partners LLC | 3.54 | 721,181 | +75.4 | 06/30/2026 |
| Vanguard Capital Management, LLC | 2.75 | 558,942 | +14.0 | 06/30/2026 |
| Point72 Asset Management, L.P. | 2.26 | 460,593 | +33.9 | 06/30/2026 |
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 |
|---|---|---|---|---|---|
| Okazaki Jason A | CEO and President | 195,532 | 3,891,087 $ | Nov 2, 2026 | direct |
| Delaney William E IV | Chief Scientific Officer | 74,035 | 1,473,297 $ | Oct 30, 2026 | direct |
| White Nicole S | Chief Manufacturing Officer | 59,257 | 1,179,214 $ | Nov 2, 2026 | direct |
| Gaggar Anuj | Chief Medical Officer | 53,800 | 1,070,620 $ | Nov 2, 2026 | direct |
| Bjorkquist Jeanette M | PFO and PAO | 17,673 | 351,693 $ | Nov 2, 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 |
|---|---|---|---|---|---|---|
| Nov 2, 2026 | Bjorkquist Jeanette M | PFO and PAO | Sell | 9 | 20.35 | 183 |
| Nov 2, 2026 | Bjorkquist Jeanette M | PFO and PAO | Sell | 718 | 19.61 | 14,078 |
| Nov 2, 2026 | White Nicole S | Chief Manufacturing Officer | Sell | 29 | 20.35 | 590 |
| Nov 2, 2026 | White Nicole S | Chief Manufacturing Officer | Sell | 2,564 | 19.61 | 50,274 |
| Nov 2, 2026 | Gaggar Anuj | Chief Medical Officer | Sell | 29 | 20.35 | 590 |
| Nov 2, 2026 | Gaggar Anuj | Chief Medical Officer | Sell | 2,564 | 19.61 | 50,274 |
| Nov 2, 2026 | Okazaki Jason A | CEO and President | Sell | 69 | 20.35 | 1,404 |
| Nov 2, 2026 | Okazaki Jason A | CEO and President | Sell | 6,133 | 19.61 | 120,254 |
| Oct 30, 2026 | Bjorkquist Jeanette M | PFO and PAO | Other | 3,840 | 0.00 | – |
| Oct 30, 2026 | White Nicole S | Chief Manufacturing Officer | Other | 13,705 | 0.00 | – |
| Oct 30, 2026 | Delaney William E IV | Chief Scientific Officer | Other | 13,705 | 0.00 | – |
| Oct 30, 2026 | Gaggar Anuj | Chief Medical Officer | Other | 13,705 | 0.00 | – |
| Oct 30, 2026 | Okazaki Jason A | CEO and President | Other | 38,380 | 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 4, 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.