Assembly Biosciences, Inc.
ASMBHealthcare|Biotechnology|US
$20.42
+0.42 (+2.10%)
Tangible Book / Share
$16.21
Cash / Share
$16.99
Ownership Breakdown
62.9%
Float
20.4M
Shares Outstanding
12.8M
Float Shares
Major Holders (34)
Combined: 291.2%
Holders of 5%+ from their latest Schedule 13D/13G filing in the last two years. Percentages are as of each filing date.
| Holder | Type | % of Class | Shares | Filed | Filing |
|---|---|---|---|---|---|
| Gilead Sciences, Inc. | Corporation | 25.10% | 4,977,089 | May 27, 2026 | 13D/G |
| Michael Kramarz | HC, IN | 9.90% | 1,615,981 | Aug 15, 2025 | 13D/G |
| Robert Egen Atkinson | HC, IN | 9.90% | 1,615,981 | Aug 15, 2025 | 13D/G |
| Commodore Capital Master LP | Partnership | 9.90% | 1,615,981 | Aug 15, 2025 | 13D/G |
| Commodore Capital LP | IA, PN | 9.90% | 1,615,981 | Aug 15, 2025 | 13D/G |
| Peter Kolchinsky | HC, IN | 9.50% | 1,530,615 | Aug 18, 2025 | 13D/G |
| Rajeev Shah | HC, IN | 9.50% | 1,530,615 | Aug 18, 2025 | 13D/G |
| RA Capital Healthcare Fund, L.P. | Partnership | 9.50% | 1,530,615 | Aug 18, 2025 | 13D/G |
| RA Capital Management, L.P. | IA, PN | 9.50% | 1,530,615 | Aug 18, 2025 | 13D/G |
| Janus Henderson Group PLC | IA, HC | 8.20% | 1,341,508 | Dec 8, 2025 | 13D/G |
| Wehrly, Mark C. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Warren, John R. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Spokes, Andrew J. M. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Short Daniel S. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Saito Edric C. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Roberts, Jr., Thomas G. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Luo Patrick (Cheng) | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Linn, Michael G. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Kim, David T. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Husen, Avner A. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Giauque, Nicolas | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Gehani, Varun N. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Dunn Hannah E. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Dreyfuss, Philip D. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Dapice Joshua J. | HC, IN | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Farallon Capital Management, L.L.C. | IA, OO | 8.10% | 1,604,590 | Aug 4, 2026 | 13D/G |
| Paradigm BioCapital Advisors LP | Partnership | 7.80% | 1,553,748 | Aug 14, 2026 | 13D/G |
| Paradigm BioCapital Advisors GP LLC | Other | 7.80% | 1,553,748 | Aug 14, 2026 | 13D/G |
| Senai Asefaw, M.D. | Individual | 7.80% | 1,553,748 | Aug 14, 2026 | 13D/G |
| Paradigm BioCapital International Fund Ltd. | Corporation | 6.90% | 1,362,882 | Aug 14, 2026 | 13D/G |
| JANUS HENDERSON GROUP Ltd. | Holding company | 6.90% | 1,359,514 | Aug 13, 2026 | 13D/G |
| Steven Boyd | HC, IN | 4.99% | 316,084 | Feb 14, 2025 | 13D/G |
| Armistice Capital, LLC | IA, OO | 4.99% | 316,084 | Feb 14, 2025 | 13D/G |
| Alexander Schornstein | Individual | 3.49% | 543,523 | Aug 18, 2025 | 13D/G |
Insider Trades (100)
Last 4 quarters: 5,469,873 acquired · 12,669 disposed
| Insider | Position | Date | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Bjorkquist Jeanette M | PFO and PAO | Oct 30, 2026 | AWARD | 3,840 | — | — | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Nov 2, 2026 | SELL | 718 | $19.61 | $14.1K | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Nov 2, 2026 | SELL | 9 | $20.35 | $183.13 | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Oct 30, 2026 | AWARD | 13,705 | — | — | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Nov 2, 2026 | SELL | 2,564 | $19.61 | $50.3K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Nov 2, 2026 | SELL | 29 | $20.35 | $590.09 | Form 4 |
| Delaney William E IV | Chief Scientific Officer | Oct 30, 2026 | AWARD | 13,705 | — | — | Form 4 |
| Gaggar Anuj | Chief Medical Officer | Oct 30, 2026 | AWARD | 13,705 | — | — | Form 4 |
| Gaggar Anuj | Chief Medical Officer | Nov 2, 2026 | SELL | 2,564 | $19.61 | $50.3K | Form 4 |
| Gaggar Anuj | Chief Medical Officer | Nov 2, 2026 | SELL | 29 | $20.35 | $590.09 | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Oct 30, 2026 | AWARD | 38,380 | — | — | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Nov 2, 2026 | SELL | 6,133 | $19.61 | $120.3K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Nov 2, 2026 | SELL | 69 | $20.35 | $1.4K | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Jun 17, 2026 | SELL | 29 | $23.25 | $674.25 | Form 4 |
| Gaggar Anuj | Chief Medical Officer | Mar 29, 2026 | AWARD | 14,000 | — | — | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Mar 29, 2026 | AWARD | 14,000 | — | — | Form 4 |
| McHutchison John G | director | Jun 4, 2026 | AWARD | 8,000 | $24.11 | $192.9K | Form 4 |
| Mahony Susan | director | Jun 4, 2026 | AWARD | 8,000 | $24.11 | $192.9K | Form 4 |
| Johnson-Pratt Lisa | director | Jun 4, 2026 | AWARD | 8,000 | $24.11 | $192.9K | Form 4 |
| Houghton Michael | director | Jun 4, 2026 | AWARD | 8,000 | $24.11 | $192.9K | Form 4 |
| Consylman Gina | director | Jun 4, 2026 | AWARD | 8,000 | $24.11 | $192.9K | Form 4 |
| ALTIG ANTHONY E | director | Jun 4, 2026 | AWARD | 8,000 | $24.11 | $192.9K | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Mar 29, 2026 | AWARD | 3,500 | — | — | Form 4 |
| Delaney William E IV | Chief Scientific Officer | Mar 29, 2026 | AWARD | 14,000 | — | — | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Mar 29, 2026 | AWARD | 50,750 | — | — | Form 4 |
| GILEAD SCIENCES, INC. | 10 percent owner | May 26, 2026 | AWARD | 471,698 | $26.50 | $12.5M | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Mar 29, 2026 | AWARD | 6,500 | — | — | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Mar 30, 2026 | SELL | 312 | $26.65 | $8.3K | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Mar 30, 2026 | SELL | 16 | $27.49 | $439.84 | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Mar 29, 2026 | AWARD | 26,000 | — | — | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Mar 30, 2026 | SELL | 188 | $26.65 | $5.0K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Mar 30, 2026 | SELL | 9 | $27.49 | $247.41 | Form 4 |
| Gaggar Anuj | Chief Medical Officer | Mar 29, 2026 | AWARD | 26,000 | — | — | Form 4 |
| Delaney William E IV | Chief Scientific Officer | Mar 29, 2026 | AWARD | 26,000 | — | — | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Mar 29, 2026 | AWARD | 94,250 | — | — | Form 4 |
| GILEAD SCIENCES, INC. | 10 percent owner | Aug 8, 2025 | BUY | 2,295,920 | $0.00 | $2.3K | Form 4 |
| GILEAD SCIENCES, INC. | 10 percent owner | Aug 8, 2025 | BUY | 1,147,960 | $21.60 | $24.8M | Form 4 |
| GILEAD SCIENCES, INC. | 10 percent owner | Aug 8, 2025 | BUY | 1,147,960 | $21.60 | $24.8M | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Jun 16, 2025 | AWARD | 300 | — | — | Form 4 |
| Bjorkquist Jeanette M | PFO and PAO | Jun 16, 2025 | AWARD | 600 | $17.24 | $10.3K | Form 4 |
| Houghton Michael | director | Jun 5, 2025 | AWARD | 3,500 | $15.81 | $55.3K | Form 4 |
| Mahony Susan | director | Jun 5, 2025 | AWARD | 3,500 | $15.81 | $55.3K | Form 4 |
| McHutchison John G | director | Jun 5, 2025 | AWARD | 3,500 | $15.81 | $55.3K | Form 4 |
| Johnson-Pratt Lisa | director | Jun 5, 2025 | AWARD | 3,500 | $15.81 | $55.3K | Form 4 |
| RINGO WILLIAM R | director | Jun 5, 2025 | AWARD | 3,500 | $15.81 | $55.3K | Form 4 |
| ALTIG ANTHONY E | director | Jun 5, 2025 | AWARD | 3,500 | $15.81 | $55.3K | Form 4 |
| Consylman Gina | director | Jun 5, 2025 | AWARD | 3,500 | $15.81 | $55.3K | Form 4 |
| McHutchison John G | director | Mar 31, 2025 | SELL | 757 | $9.85 | $7.5K | Form 4 |
| Delaney William E IV | Chief Scientific Officer | Mar 29, 2025 | AWARD | 25,500 | $10.62 | $270.8K | Form 4 |
| Bjorkquist Jeanette M | Principal Accounting Officer | Mar 29, 2025 | AWARD | 1,655 | — | — | Form 4 |
| Bjorkquist Jeanette M | Principal Accounting Officer | Mar 31, 2025 | SELL | 180 | $9.85 | $1.8K | Form 4 |
| Bjorkquist Jeanette M | Principal Accounting Officer | Mar 29, 2025 | AWARD | 1,900 | $10.62 | $20.2K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Mar 29, 2025 | AWARD | 71,100 | $10.62 | $755.1K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Mar 31, 2025 | SELL | 355 | $9.85 | $3.5K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Mar 29, 2025 | AWARD | 20,400 | $10.62 | $216.6K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Mar 31, 2025 | SELL | 197 | $9.85 | $1.9K | Form 4 |
| Gaggar Anuj | Chief Medical Officer | Mar 29, 2025 | AWARD | 24,200 | $10.62 | $257.0K | Form 4 |
| Houghton Michael | director | Dec 30, 2024 | BUY | 3,202 | $15.61 | $50.0K | Form 4 |
| GILEAD SCIENCES, INC. | 10 percent owner | Dec 19, 2024 | BUY | 940,499 | $21.37 | $20.1M | Form 4 |
| Schornstein Alexander | 10 percent owner | Nov 25, 2024 | BUY | 5,000 | $14.85 | $74.3K | Form 4 |
| Schornstein Alexander | 10 percent owner | Nov 25, 2024 | BUY | 2,976 | $15.00 | $44.6K | Form 4 |
| Schornstein Alexander | 10 percent owner | Nov 22, 2024 | BUY | 17,024 | $14.87 | $253.1K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Nov 18, 2024 | SELL | 40 | $16.29 | $651.60 | Form 4 |
| Schornstein Alexander | 10 percent owner | Oct 8, 2024 | BUY | 10,000 | $14.58 | $145.8K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Oct 3, 2024 | SELL | 157 | $14.81 | $2.3K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Oct 3, 2024 | SELL | 197 | $14.81 | $2.9K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Aug 2, 2024 | SELL | 785 | $14.23 | $11.2K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Aug 2, 2024 | SELL | 981 | $14.23 | $14.0K | Form 4 |
| Schornstein Alexander | 10 percent owner | Jul 5, 2024 | BUY | 4,438 | $12.52 | $55.6K | Form 4 |
| Schornstein Alexander | 10 percent owner | Jul 3, 2024 | BUY | 4,562 | $12.29 | $56.1K | Form 4 |
| GILEAD SCIENCES, INC. | 10 percent owner | Jun 17, 2024 | BUY | 179,500 | $0.00 | $179.50 | Form 4 |
| GILEAD SCIENCES, INC. | 10 percent owner | Jun 17, 2024 | BUY | 179,500 | $17.00 | $3.1M | Form 4 |
| Johnson-Pratt Lisa | director | May 29, 2024 | AWARD | 2,750 | $15.06 | $41.4K | Form 4 |
| McHutchison John G | director | May 29, 2024 | AWARD | 2,750 | $15.06 | $41.4K | Form 4 |
| Mahony Susan | director | May 29, 2024 | AWARD | 2,750 | $15.06 | $41.4K | Form 4 |
| Houghton Michael | director | May 29, 2024 | AWARD | 2,750 | $15.06 | $41.4K | Form 4 |
| Consylman Gina | director | May 29, 2024 | AWARD | 2,750 | $15.06 | $41.4K | Form 4 |
| ALTIG ANTHONY E | director | May 29, 2024 | AWARD | 2,750 | $15.06 | $41.4K | Form 4 |
| RINGO WILLIAM R | director | May 29, 2024 | AWARD | 2,750 | $15.06 | $41.4K | Form 4 |
| Bjorkquist Jeanette M | Principal Accounting Officer | May 23, 2024 | SELL | 24 | $14.93 | $358.41 | Form 4 |
| McHutchison John G | director | May 23, 2024 | SELL | 2,117 | $14.93 | $31.6K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | May 23, 2024 | SELL | 172 | $14.93 | $2.6K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | May 23, 2024 | SELL | 549 | $14.93 | $8.2K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Apr 29, 2024 | AWARD | 3,333 | — | — | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Apr 30, 2024 | SELL | 1,255 | $12.71 | $15.9K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Apr 29, 2024 | AWARD | 4,166 | — | — | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Apr 30, 2024 | SELL | 1,569 | $12.71 | $19.9K | Form 4 |
| Delaney William E IV | Chief Scientific Officer | Apr 29, 2024 | AWARD | 3,333 | — | — | Form 4 |
| McHutchison John G | director | Apr 1, 2024 | SELL | 1,206 | $13.07 | $15.8K | Form 4 |
| Bjorkquist Jeanette M | Principal Accounting Officer | Mar 29, 2024 | AWARD | 850 | — | — | Form 4 |
| Bjorkquist Jeanette M | Principal Accounting Officer | Apr 1, 2024 | SELL | 114 | $13.07 | $1.5K | Form 4 |
| Bjorkquist Jeanette M | Principal Accounting Officer | Mar 29, 2024 | AWARD | 1,550 | $13.30 | $20.6K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Mar 29, 2024 | AWARD | 17,500 | $13.30 | $232.8K | Form 4 |
| White Nicole S | Chief Manufacturing Officer | Apr 1, 2024 | SELL | 197 | $13.07 | $2.6K | Form 4 |
| Delaney William E IV | Chief Scientific Officer | Mar 29, 2024 | AWARD | 20,000 | $13.30 | $266.0K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Mar 29, 2024 | AWARD | 65,000 | $13.30 | $864.5K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Apr 1, 2024 | SELL | 354 | $13.07 | $4.6K | Form 4 |
| Okazaki Jason A | director, officer: CEO and President | Mar 27, 2024 | SELL | 392 | $12.87 | $5.0K | Form 4 |
| Cook Robert Donald II | Mar 13, 2024 | OTHER | 0 | — | — | Form 4 | |
| Schornstein Alexander | 10 percent owner | Jan 18, 2024 | BUY | 345,086 | $0.80 | $276.1K | Form 4 |
Congress & Senate Trades (2)
Chris JacobsHouse · NY27Jan 4, 2021
Chris JacobsHouse · NY27Dec 28, 2020