STRO
Sutro Biopharma
NASDAQ: STRO · HEALTHCARE · BIOTECHNOLOGY
$9.29
+4.74% today
Updated 2026-10-28
Market cap
$154.70M
P/E ratio
—
P/S ratio
3.39x
EPS (TTM)
$-15.69
Dividend yield
—
52W range
$7 – $44
Volume
0.3M
Sutro Biopharma (STRO) Insider transactions
Net insider activity
Net buying (1,252,017 shares)
Buy transactions
62
Sell transactions
38
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-05 | WIGGINTON, JON MARC | Director | Buy | 10,000 | — | — |
| 2026-06-05 | PETREE, DANIEL H | Director | Buy | 10,000 | — | — |
| 2026-06-05 | PANEK, JAMES P | Director | Buy | 10,000 | — | — |
| 2026-06-05 | MATSUI, CONNIE | Director | Buy | 10,000 | — | — |
| 2026-06-05 | LOBACKI, JOSEPH M | Director | Buy | 10,000 | — | — |
| 2026-06-05 | JAGPAL, SUKHI | Director | Buy | 10,000 | — | — |
| 2026-06-05 | HUNTER, HEIDI | Director | Buy | 10,000 | — | — |
| 2026-06-05 | DYBBS, MICHAEL | Director | Buy | 10,000 | — | — |
| 2026-06-02 | CHOW, GREGORY K. | CFO | Sale | 2,500 | — | — |
| 2026-06-02 | CHOW, GREGORY K. | CFO | Buy | 2,500 | — | — |
| 2026-03-04 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Sale | 675 | — | — |
| 2026-03-04 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Buy | 675 | — | — |
| 2026-03-04 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Sale | 277 | $21.31 | $5902.87 |
| 2026-03-04 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 788 | — | — |
| 2026-03-04 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 788 | — | — |
| 2026-03-04 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 282 | $21.31 | $6009.42 |
| 2026-03-02 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Buy | 33,600 | — | — |
| 2026-03-02 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Buy | 4,200 | — | — |
| 2026-03-02 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Sale | 2,356 | — | — |
| 2026-03-02 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Buy | 2,356 | — | — |
| 2026-03-02 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Sale | 970 | $20.55 | $19933.50 |
| 2026-03-02 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Buy | 40,000 | — | — |
| 2026-03-02 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Buy | 5,000 | — | — |
| 2026-03-02 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Sale | 2,843 | — | — |
| 2026-03-02 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Buy | 2,843 | — | — |
| 2026-03-02 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Sale | 1,170 | $20.55 | $24043.50 |
| 2026-03-02 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 175,000 | — | — |
| 2026-03-02 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 40,000 | — | — |
| 2026-03-02 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 7,750 | — | — |
| 2026-03-02 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 7,750 | — | — |
| 2026-03-02 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 2,779 | $20.55 | $57108.45 |
| 2026-03-02 | CHOW, GREGORY K. | CFO | Buy | 40,000 | — | — |
| 2026-03-02 | CHOW, GREGORY K. | CFO | Buy | 5,000 | — | — |
| 2026-03-01 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Sale | 842 | — | — |
| 2026-03-01 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Sale | 500 | — | — |
| 2026-03-01 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Buy | 842 | — | — |
| 2026-03-01 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Sale | 551 | $20.47 | $11278.97 |
| 2026-03-01 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Buy | 500 | — | — |
| 2026-03-01 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Sale | 1,125 | — | — |
| 2026-03-01 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Buy | 1,125 | — | — |
| 2026-03-01 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Sale | 463 | $20.47 | $9477.61 |
| 2026-03-01 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 2,500 | — | — |
| 2026-03-01 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 688 | — | — |
| 2026-03-01 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 2,500 | — | — |
| 2026-03-01 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 1,271 | $20.47 | $26017.37 |
| 2026-03-01 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 688 | — | — |
| 2025-12-23 | WIGGINTON, JON MARC | Director | Buy | 1,500 | — | — |
| 2025-12-23 | PETREE, DANIEL H | Director | Buy | 1,500 | — | — |
| 2025-12-23 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Buy | 7,200 | — | — |
| 2025-12-23 | PANEK, JAMES P | Director | Buy | 1,500 | — | — |
| 2025-12-23 | MATSUI, CONNIE | Director | Buy | 1,500 | — | — |
| 2025-12-23 | LOBACKI, JOSEPH M | Director | Buy | 1,500 | — | — |
| 2025-12-23 | JAGPAL, SUKHI | Director | Buy | 1,500 | — | — |
| 2025-12-23 | HUNTER, HEIDI | Director | Buy | 1,500 | — | — |
| 2025-12-23 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Buy | 7,925 | — | — |
| 2025-12-23 | DYBBS, MICHAEL | Director | Buy | 1,500 | — | — |
| 2025-12-23 | CHOW, GREGORY K. | CFO | Buy | 8,200 | — | — |
| 2025-12-12 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 2,500 | — | — |
| 2025-12-12 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 2,500 | — | — |
| 2025-12-12 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 894 | $8.02 | $7165.41 |
| 2025-10-15 | PAULING, DAVID | Chief Admin. Ofcr. & GC | Buy | 12,504 | $0.80 | $9993.20 |
| 2025-10-15 | MATSUI, CONNIE | Director | Buy | 50,000 | $0.80 | $39950.00 |
| 2025-10-15 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Buy | 17,000 | $0.80 | $13606.80 |
| 2025-10-15 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 12,500 | $0.80 | $10011.25 |
| 2025-10-15 | CHOW, GREGORY K. | CFO | Buy | 19,750 | $0.81 | $15997.50 |
| 2025-09-18 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Sale | 37,500 | — | — |
| 2025-09-18 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Buy | 37,500 | — | — |
| 2025-09-18 | GERBER, HANS-PETER | CHIEF SCIENTIFIC OFFICER | Sale | 13,417 | $0.90 | $12075.30 |
| 2025-08-09 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 18,750 | — | — |
| 2025-08-09 | CHUNG, JANE | Director, Chief Executive Officer | Buy | 18,750 | — | — |
| 2025-08-09 | CHUNG, JANE | Director, Chief Executive Officer | Sale | 6,708 | $0.80 | $5366.40 |
| 2025-07-08 | LEYMAN, BARBARA | Chief Business Officer | Sale | 25,000 | — | — |
| 2025-07-08 | LEYMAN, BARBARA | Chief Business Officer | Buy | 25,000 | — | — |
| 2025-07-08 | LEYMAN, BARBARA | Chief Business Officer | Sale | 8,944 | $0.78 | $6976.32 |
| 2025-06-06 | WIGGINTON, JON MARC | Director | Buy | 50,000 | — | — |
| 2025-06-06 | PETREE, DANIEL H | Director | Buy | 50,000 | — | — |
| 2025-06-06 | PANEK, JAMES P | Director | Buy | 50,000 | — | — |
| 2025-06-06 | MATSUI, CONNIE | Director | Buy | 50,000 | — | — |
| 2025-06-06 | LOBACKI, JOSEPH M | Director | Buy | 50,000 | — | — |
| 2025-06-06 | JAGPAL, SUKHI | Director | Buy | 50,000 | — | — |
| 2025-06-06 | HUNTER, HEIDI | Director | Buy | 50,000 | — | — |
| 2025-06-06 | DYBBS, MICHAEL | Director | Buy | 50,000 | — | — |
| 2025-06-02 | CHOW, GREGORY K. | CFO | Buy | 275,000 | — | — |
| 2025-06-02 | CHOW, GREGORY K. | CFO | Buy | 100,000 | — | — |
| 2025-05-15 | ALBINI, EDWARD C | CFO AND SECRETARY | Sale | 24,438 | — | — |
| 2025-05-15 | ALBINI, EDWARD C | CFO AND SECRETARY | Sale | 11,156 | — | — |
| 2025-05-15 | ALBINI, EDWARD C | CFO AND SECRETARY | Sale | 9,125 | — | — |
| 2025-05-15 | ALBINI, EDWARD C | CFO AND SECRETARY | Buy | 24,438 | — | — |
| 2025-05-15 | ALBINI, EDWARD C | CFO AND SECRETARY | Sale | 15,995 | $0.88 | $14075.60 |
| 2025-05-15 | ALBINI, EDWARD C | CFO AND SECRETARY | Buy | 11,156 | — | — |
| 2025-05-15 | ALBINI, EDWARD C | CFO AND SECRETARY | Buy | 9,125 | — | — |
| 2025-05-01 | SRINIVASAN, VENKATESH | CHIEF TECH OP OFFICER | Sale | 2,500 | — | — |
| 2025-05-01 | SRINIVASAN, VENKATESH | CHIEF TECH OP OFFICER | Buy | 2,500 | — | — |
| 2025-05-01 | SRINIVASAN, VENKATESH | CHIEF TECH OP OFFICER | Sale | 894 | $1.07 | $956.58 |
| 2025-05-01 | FITZPATRICK, LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sale | 13,140 | — | — |
| 2025-05-01 | FITZPATRICK, LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sale | 9,740 | — | — |
| 2025-05-01 | FITZPATRICK, LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sale | 9,125 | — | — |
| 2025-05-01 | FITZPATRICK, LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sale | 5,844 | — | — |
| 2025-05-01 | FITZPATRICK, LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sale | 13,538 | $1.07 | $14485.66 |
| 2025-05-01 | FITZPATRICK, LINDA A | CHIEF PEOPLE & COMM. OFFICER | Buy | 13,140 | — | — |
Frequently asked questions
Are STRO insiders buying or selling?
Over the transactions on record, STRO insiders have been net buyers, with about $220872.96 in stock sold across 38 sales, against 5 open-market purchases.
Does insider selling at STRO 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 STRO insiders are selling the most?
Recent selling is concentrated in a few names. CHUNG, JANE accounts for the largest share on record, with about $101667.05 sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.