STRO
Sutro Biopharma, Inc.$29.00+2.52 (+9.52%)Prev Close$26.48·MCap$212.7M·P/E—·Vol105.5K·Yield—
▲
Buys (12M)
5
$89.6K
▼
Sells (12M)
4
$31.6K
◆
Net Activity
Net Buyer
$58.0K
●
Active Insiders
8
last 12 mo
Over the past 12 months, insider activity at Sutro Biopharma, Inc. (STRO) has been dominated by buying, with 5 insider purchases totaling $89.6K and 4 insider sales totaling $31.6K. The most recent insider transaction was by Chung Jane (Chief Executive Officer), who sold $7.2K worth of shares on Dec 12, 2025. Sutro Biopharma, Inc. operates in the Healthcare sector, within the Biotechnology industry, with a market cap of $212.7M.
STRO Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Dec 12, 2025 | Chung Jane | Chief Executive Officer | Sell | 894 | $8.02 | $7.2K | 0 |
| Oct 15, 2025 | Chow Gregory K. | CFO | Buy | 19,750 | $0.81 | $16.0K | 0 |
| Oct 15, 2025 | Chung Jane | Chief Executive Officer | Buy | 12,500 | $0.80 | $10.0K | 0 |
| Oct 15, 2025 | Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Buy | 17,000 | $0.80 | $13.6K | 0 |
| Oct 15, 2025 | MATSUI CONNIE | Director | Buy | 50,000 | $0.80 | $40.0K0.6% OS | 0 |
| Oct 15, 2025 | Pauling David | Chief Admin. Ofcr. & GC | Buy | 12,504 | $0.80 | $10.0K | 0 |
| Sep 18, 2025 | Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sell | 13,417 | $0.90 | $12.1K | 0 |
| Aug 9, 2025 | Chung Jane | Chief Executive Officer | Sell | 6,708 | $0.80 | $5.4K | 0 |
| Jul 8, 2025 | Leyman Barbara | Chief Business Officer | Sell | 8,944 | $0.78 | $7.0K | 0 |
| May 15, 2025 | ALBINI EDWARD C | CFO AND SECRETARY | Sell | 15,995 | $0.88 | $14.1K | 0 |
| May 1, 2025 | Borgman Anne Elizabeth | CHIEF MEDICAL OFFICER | Sell | 24,709 | $1.07 | $26.4K | 0 |
| May 1, 2025 | FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sell | 13,538 | $1.07 | $14.5K | 0 |
| May 1, 2025 | Srinivasan Venkatesh | CHIEF TECH OP OFFICER | Sell | 894 | $1.07 | $956.58 | 0 |
| Apr 11, 2025 | Srinivasan Venkatesh | CHIEF TECH OP OFFICER | Sell | 7,603 | $0.60 | $4.6K | 0 |
| Mar 5, 2025 | FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sell | 3,594 | $1.36 | $4.9K | 0 |
| Mar 5, 2025 | NEWELL WILLIAM J | CEO | Sell | 6,708 | $1.36 | $9.1K | 0 |
| Mar 4, 2025 | ALBINI EDWARD C | CFO AND SECRETARY | Sell | 3,748 | $1.42 | $5.3K | 0 |
| Mar 4, 2025 | Chung Jane | PRESIDENT AND COO | Sell | 2,334 | $1.42 | $3.3K | 0 |
| Mar 4, 2025 | NEWELL WILLIAM J | CEO | Sell | 11,136 | $1.42 | $15.8K | 0 |
| Mar 1, 2025 | ALBINI EDWARD C | CFO AND SECRETARY | Sell | 10,320 | $1.59 | $16.4K | 0 |
| Mar 1, 2025 | Chung Jane | PRESIDENT AND COO | Sell | 9,450 | $1.59 | $15.0K | 0 |
| Mar 1, 2025 | FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sell | 8,327 | $1.59 | $13.2K | 0 |
| Mar 1, 2025 | Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sell | 4,621 | $1.59 | $7.3K | 0 |
| Mar 1, 2025 | NEWELL WILLIAM J | CEO | Sell | 25,203 | $1.59 | $40.1K | 0 |
| Mar 1, 2025 | Srinivasan Venkatesh | CHIEF TECH OP OFFICER | Sell | 4,672 | $1.59 | $7.4K | 0 |
| Feb 28, 2025 | Borgman Anne Elizabeth | CHIEF MEDICAL OFFICER | Sell | 15,405 | $1.59 | $24.5K | 0 |
| Jan 31, 2024 | Vasquez Nicki | CHIEF PORT. STRAT & ALNCE OFCR | Sell | 12,185 | $5.00 | $60.9K | 12,803-49% |
| Aug 29, 2023 | Shtylla Brunilda | Chief Business Officer | Sell | 15,428 | $4.71 | $72.6K | 0Exit |
| Aug 28, 2023 | Shtylla Brunilda | Chief Business Officer | Sell | 11,613 | $4.59 | $53.3K | 12,928-47% |
| Mar 15, 2022 | NEWELL WILLIAM J | CEO | Buy | 10,000 | $7.75 | $77.5K | 116,525 |
| Sep 28, 2021 | Vasquez Nicki | Chief Port. Strat & Alnce Ofcr | Sell | 3,906 | $18.62 | $72.7K | 7,270-35% |
STRO Insider Buying Activity
The following table shows recent insider purchases of Sutro Biopharma, Inc. (STRO) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Oct 15, 2025 | Chow Gregory K. | CFO | Buy | 19,750 | $0.81 | $16.0K | 0 |
| Oct 15, 2025 | Chung Jane | Chief Executive Officer | Buy | 12,500 | $0.80 | $10.0K | 0 |
| Oct 15, 2025 | Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Buy | 17,000 | $0.80 | $13.6K | 0 |
| Oct 15, 2025 | MATSUI CONNIE | Director | Buy | 50,000 | $0.80 | $40.0K0.6% OS | 0 |
| Oct 15, 2025 | Pauling David | Chief Admin. Ofcr. & GC | Buy | 12,504 | $0.80 | $10.0K | 0 |
| Mar 15, 2022 | NEWELL WILLIAM J | CEO | Buy | 10,000 | $7.75 | $77.5K | 116,525 |
STRO Insider Selling Activity
The following table shows recent insider sales of Sutro Biopharma, Inc. (STRO) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Dec 12, 2025 | Chung Jane | Chief Executive Officer | Sell | 894 | $8.02 | $7.2K | 0 |
| Sep 18, 2025 | Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sell | 13,417 | $0.90 | $12.1K | 0 |
| Aug 9, 2025 | Chung Jane | Chief Executive Officer | Sell | 6,708 | $0.80 | $5.4K | 0 |
| Jul 8, 2025 | Leyman Barbara | Chief Business Officer | Sell | 8,944 | $0.78 | $7.0K | 0 |
| May 15, 2025 | ALBINI EDWARD C | CFO AND SECRETARY | Sell | 15,995 | $0.88 | $14.1K | 0 |
| May 1, 2025 | Borgman Anne Elizabeth | CHIEF MEDICAL OFFICER | Sell | 24,709 | $1.07 | $26.4K | 0 |
| May 1, 2025 | FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sell | 13,538 | $1.07 | $14.5K | 0 |
| May 1, 2025 | Srinivasan Venkatesh | CHIEF TECH OP OFFICER | Sell | 894 | $1.07 | $956.58 | 0 |
| Apr 11, 2025 | Srinivasan Venkatesh | CHIEF TECH OP OFFICER | Sell | 7,603 | $0.60 | $4.6K | 0 |
| Mar 5, 2025 | FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sell | 3,594 | $1.36 | $4.9K | 0 |
| Mar 5, 2025 | NEWELL WILLIAM J | CEO | Sell | 6,708 | $1.36 | $9.1K | 0 |
| Mar 4, 2025 | ALBINI EDWARD C | CFO AND SECRETARY | Sell | 3,748 | $1.42 | $5.3K | 0 |
| Mar 4, 2025 | Chung Jane | PRESIDENT AND COO | Sell | 2,334 | $1.42 | $3.3K | 0 |
| Mar 4, 2025 | NEWELL WILLIAM J | CEO | Sell | 11,136 | $1.42 | $15.8K | 0 |
| Mar 1, 2025 | ALBINI EDWARD C | CFO AND SECRETARY | Sell | 10,320 | $1.59 | $16.4K | 0 |
| Mar 1, 2025 | Chung Jane | PRESIDENT AND COO | Sell | 9,450 | $1.59 | $15.0K | 0 |
| Mar 1, 2025 | FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | Sell | 8,327 | $1.59 | $13.2K | 0 |
| Mar 1, 2025 | Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sell | 4,621 | $1.59 | $7.3K | 0 |
| Mar 1, 2025 | NEWELL WILLIAM J | CEO | Sell | 25,203 | $1.59 | $40.1K | 0 |
| Mar 1, 2025 | Srinivasan Venkatesh | CHIEF TECH OP OFFICER | Sell | 4,672 | $1.59 | $7.4K | 0 |
| Feb 28, 2025 | Borgman Anne Elizabeth | CHIEF MEDICAL OFFICER | Sell | 15,405 | $1.59 | $24.5K | 0 |
| Jan 31, 2024 | Vasquez Nicki | CHIEF PORT. STRAT & ALNCE OFCR | Sell | 12,185 | $5.00 | $60.9K | 12,803-49% |
| Aug 29, 2023 | Shtylla Brunilda | Chief Business Officer | Sell | 15,428 | $4.71 | $72.6K | 0Exit |
| Aug 28, 2023 | Shtylla Brunilda | Chief Business Officer | Sell | 11,613 | $4.59 | $53.3K | 12,928-47% |
| Sep 28, 2021 | Vasquez Nicki | Chief Port. Strat & Alnce Ofcr | Sell | 3,906 | $18.62 | $72.7K | 7,270-35% |
STRO Insiders
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