ASMB
Assembly Biosciences Inc
NASDAQ: ASMB · HEALTHCARE · BIOTECHNOLOGY
$20.57
+1.33% today
Updated 2026-10-28
Market cap
$409.04M
P/E ratio
19.32
P/S ratio
5.47x
EPS (TTM)
$1.04
Dividend yield
—
52W range
$20 – $40
Volume
0.3M
Assembly Biosciences Inc (ASMB) Insider transactions
Net insider activity
Net buying (8,575,050 shares)
Buy transactions
68
Sell transactions
32
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-17 | BJORKQUIST, JEANETTE M | PFO and PAO | Sale | 29 | $23.25 | $674.25 |
| 2026-06-04 | MCHUTCHISON, JOHN G | Director | Buy | 8,000 | — | — |
| 2026-06-04 | MAHONY, SUSAN | Director | Buy | 8,000 | — | — |
| 2026-06-04 | JOHNSON-PRATT, LISA | Director | Buy | 8,000 | — | — |
| 2026-06-04 | HOUGHTON, MICHAEL | Director | Buy | 8,000 | — | — |
| 2026-06-04 | CONSYLMAN, GINA | Director | Buy | 8,000 | — | — |
| 2026-06-04 | ALTIG, ANTHONY E | Director | Buy | 8,000 | — | — |
| 2026-05-26 | GILEAD, SCIENCES, INC. | 10% Owner | Buy | 471,698 | $26.50 | $12.50M |
| 2026-03-30 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 188 | $26.65 | $5010.24 |
| 2026-03-30 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 9 | $27.49 | $247.41 |
| 2026-03-30 | BJORKQUIST, JEANETTE M | PFO and PAO | Sale | 312 | $26.65 | $8314.86 |
| 2026-03-30 | BJORKQUIST, JEANETTE M | PFO and PAO | Sale | 16 | $27.49 | $439.84 |
| 2026-03-29 | WHITE, NICOLE S | Chief Manufacturing Officer | Buy | 26,000 | — | — |
| 2026-03-29 | WHITE, NICOLE S | Chief Manufacturing Officer | Buy | 14,000 | — | — |
| 2026-03-29 | OKAZAKI, JASON A | Director, CEO and President | Buy | 94,250 | — | — |
| 2026-03-29 | OKAZAKI, JASON A | Director, CEO and President | Buy | 50,750 | — | — |
| 2026-03-29 | GAGGAR, ANUJ | Chief Medical Officer | Buy | 26,000 | — | — |
| 2026-03-29 | GAGGAR, ANUJ | Chief Medical Officer | Buy | 14,000 | — | — |
| 2026-03-29 | DELANEY, WILLIAM E IV | Chief Scientific Officer | Buy | 26,000 | — | — |
| 2026-03-29 | DELANEY, WILLIAM E IV | Chief Scientific Officer | Buy | 14,000 | — | — |
| 2026-03-29 | BJORKQUIST, JEANETTE M | PFO and PAO | Buy | 6,500 | — | — |
| 2026-03-29 | BJORKQUIST, JEANETTE M | PFO and PAO | Buy | 3,500 | — | — |
| 2025-08-08 | GILEAD, SCIENCES, INC. | 10% Owner | Buy | 2,295,920 | — | — |
| 2025-08-08 | GILEAD, SCIENCES, INC. | 10% Owner | Buy | 1,147,960 | — | — |
| 2025-08-08 | GILEAD, SCIENCES, INC. | 10% Owner | Buy | 1,147,960 | — | — |
| 2025-06-16 | BJORKQUIST, JEANETTE M | PFO and PAO | Buy | 600 | — | — |
| 2025-06-16 | BJORKQUIST, JEANETTE M | PFO and PAO | Buy | 300 | — | — |
| 2025-06-05 | RINGO, WILLIAM R | Director | Buy | 3,500 | — | — |
| 2025-06-05 | MCHUTCHISON, JOHN G | Director | Buy | 3,500 | — | — |
| 2025-06-05 | MAHONY, SUSAN | Director | Buy | 3,500 | — | — |
| 2025-06-05 | JOHNSON-PRATT, LISA | Director | Buy | 3,500 | — | — |
| 2025-06-05 | HOUGHTON, MICHAEL | Director | Buy | 3,500 | — | — |
| 2025-06-05 | CONSYLMAN, GINA | Director | Buy | 3,500 | — | — |
| 2025-06-05 | ALTIG, ANTHONY E | Director | Buy | 3,500 | — | — |
| 2025-03-31 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 197 | $9.85 | $1940.08 |
| 2025-03-31 | OKAZAKI, JASON A | Director, CEO and President | Sale | 355 | $9.85 | $3496.08 |
| 2025-03-31 | MCHUTCHISON, JOHN G | Director | Sale | 757 | $9.85 | $7455.01 |
| 2025-03-31 | BJORKQUIST, JEANETTE M | Principal Accounting Officer | Sale | 180 | $9.85 | $1772.66 |
| 2025-03-29 | WHITE, NICOLE S | Chief Manufacturing Officer | Buy | 20,400 | — | — |
| 2025-03-29 | OKAZAKI, JASON A | Director, CEO and President | Buy | 71,100 | — | — |
| 2025-03-29 | GAGGAR, ANUJ | Chief Medical Officer | Buy | 24,200 | — | — |
| 2025-03-29 | DELANEY, WILLIAM E IV | Chief Scientific Officer | Buy | 25,500 | — | — |
| 2025-03-29 | BJORKQUIST, JEANETTE M | Principal Accounting Officer | Buy | 1,900 | — | — |
| 2025-03-29 | BJORKQUIST, JEANETTE M | Principal Accounting Officer | Buy | 1,655 | — | — |
| 2024-12-30 | HOUGHTON, MICHAEL | Director | Buy | 3,202 | $15.61 | $49997.63 |
| 2024-12-19 | GILEAD, SCIENCES, INC. | 10% Owner | Buy | 940,499 | $21.37 | $20.10M |
| 2024-11-25 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 5,000 | $14.85 | $74250.00 |
| 2024-11-25 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 2,976 | $15.00 | $44640.00 |
| 2024-11-22 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 17,024 | $14.87 | $253104.32 |
| 2024-11-18 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 40 | $16.29 | $651.60 |
| 2024-10-08 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 10,000 | $14.58 | $145800.00 |
| 2024-10-03 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 157 | $14.81 | $2325.17 |
| 2024-10-03 | OKAZAKI, JASON A | Director, CEO and President | Sale | 197 | $14.81 | $2917.57 |
| 2024-08-02 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 785 | $14.23 | $11172.51 |
| 2024-08-02 | OKAZAKI, JASON A | Director, CEO and President | Sale | 981 | $14.23 | $13962.08 |
| 2024-07-05 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 4,438 | $12.52 | $55563.76 |
| 2024-07-03 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 4,562 | $12.29 | $56066.98 |
| 2024-06-17 | GILEAD, SCIENCES, INC. | 10% Owner | Buy | 179,500 | — | — |
| 2024-06-17 | GILEAD, SCIENCES, INC. | 10% Owner | Buy | 179,500 | — | — |
| 2024-05-29 | RINGO, WILLIAM R | Director | Buy | 2,750 | — | — |
| 2024-05-29 | MCHUTCHISON, JOHN G | Director | Buy | 2,750 | — | — |
| 2024-05-29 | MAHONY, SUSAN | Director | Buy | 2,750 | — | — |
| 2024-05-29 | JOHNSON-PRATT, LISA | Director | Buy | 2,750 | — | — |
| 2024-05-29 | HOUGHTON, MICHAEL | Director | Buy | 2,750 | — | — |
| 2024-05-29 | CONSYLMAN, GINA | Director | Buy | 2,750 | — | — |
| 2024-05-29 | ALTIG, ANTHONY E | Director | Buy | 2,750 | — | — |
| 2024-05-23 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 172 | $14.93 | $2568.61 |
| 2024-05-23 | OKAZAKI, JASON A | Director, CEO and President | Sale | 549 | $14.93 | $8198.66 |
| 2024-05-23 | MCHUTCHISON, JOHN G | Director | Sale | 2,117 | $14.93 | $31614.85 |
| 2024-05-23 | BJORKQUIST, JEANETTE M | Principal Accounting Officer | Sale | 24 | $14.93 | $358.41 |
| 2024-04-30 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 1,255 | $12.71 | $15947.03 |
| 2024-04-30 | OKAZAKI, JASON A | Director, CEO and President | Sale | 1,569 | $12.71 | $19936.97 |
| 2024-04-29 | WHITE, NICOLE S | Chief Manufacturing Officer | Buy | 3,333 | — | — |
| 2024-04-29 | OKAZAKI, JASON A | Director, CEO and President | Buy | 4,166 | — | — |
| 2024-04-29 | DELANEY, WILLIAM E IV | Chief Scientific Officer | Buy | 3,333 | — | — |
| 2024-04-01 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 197 | $13.07 | $2575.16 |
| 2024-04-01 | OKAZAKI, JASON A | Director, CEO and President | Sale | 354 | $13.07 | $4627.45 |
| 2024-04-01 | MCHUTCHISON, JOHN G | Director | Sale | 1,206 | $13.07 | $15764.71 |
| 2024-04-01 | BJORKQUIST, JEANETTE M | Principal Accounting Officer | Sale | 114 | $13.07 | $1490.20 |
| 2024-03-29 | WHITE, NICOLE S | Chief Manufacturing Officer | Buy | 17,500 | — | — |
| 2024-03-29 | OKAZAKI, JASON A | Director, CEO and President | Buy | 65,000 | — | — |
| 2024-03-29 | DELANEY, WILLIAM E IV | Chief Scientific Officer | Buy | 20,000 | — | — |
| 2024-03-29 | BJORKQUIST, JEANETTE M | Principal Accounting Officer | Buy | 1,550 | — | — |
| 2024-03-29 | BJORKQUIST, JEANETTE M | Principal Accounting Officer | Buy | 850 | — | — |
| 2024-03-27 | OKAZAKI, JASON A | Director, CEO and President | Sale | 392 | $12.87 | $5045.04 |
| 2024-01-18 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 345,086 | $0.80 | $276068.80 |
| 2024-01-17 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 299,994 | $0.78 | $235195.30 |
| 2023-11-21 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 100,000 | $0.67 | $66700.00 |
| 2023-11-20 | SCHORNSTEIN, ALEXANDER | 10% Owner | Buy | 300,000 | $0.72 | $215400.00 |
| 2023-11-17 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 477 | $0.69 | $328.65 |
| 2023-11-08 | GAGGAR, ANUJ | Chief Medical Officer | Buy | 500,000 | — | — |
| 2023-10-03 | WHITE, NICOLE S | Chief Manufacturing Officer | Sale | 1,891 | $0.80 | $1503.91 |
| 2023-10-03 | OKAZAKI, JASON A | Director, CEO and President | Sale | 2,363 | $0.80 | $1879.29 |
| 2023-10-03 | DELANEY, WILLIAM E IV | Chief Scientific Officer | Sale | 1,891 | $0.80 | $1503.91 |
| 2023-10-02 | WHITE, NICOLE S | Chief Manufacturing Officer | Buy | 10,000 | — | — |
| 2023-10-02 | OKAZAKI, JASON A | Director, CEO and President | Buy | 12,500 | — | — |
| 2023-10-02 | DELANEY, WILLIAM E IV | Chief Scientific Officer | Buy | 10,000 | — | — |
| 2023-08-02 | OKAZAKI, JASON A | Director, CEO and President | Sale | 11,827 | $1.09 | $12866.59 |
| 2023-08-02 | DELANEY, WILLIAM E IV | Chief Scientific Officer | Sale | 9,461 | $1.09 | $10292.62 |
| 2023-07-24 | BJORKQUIST, JEANETTE M | Principal Accounting Officer | Sale | 844 | $1.07 | $900.38 |
Frequently asked questions
Are ASMB insiders buying or selling?
Over the transactions on record, ASMB insiders have been net buyers, with about $197781.83 in stock sold across 32 sales, against 13 open-market purchases.
Does insider selling at ASMB mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which ASMB insiders are selling the most?
Recent selling is concentrated in a few names. OKAZAKI, JASON A accounts for the largest share on record, with about $72929.73 sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.