Gregory K. Chow insider trades: Sutro Biopharma (STRO) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Gregory reports to the SEC
Open-market buys and sales
4 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Oct 15, 2025 | STRO | ↑ Buy | 19,750 | $0.81 | $16K | Direct | Oct 16, 2025 (1d) |
| Jul 10, 2020 | APTO | ↓ Sell | 126,668 | $6.05 | $766K | Direct | Jul 10, 2020 (0d) |
| Jun 5, 2019 | APTO | ↑ Buy | 7,500 | $1.84 | $14K | Direct | Jun 7, 2019 (2d) |
| Mar 13, 2019 | APTO | ↑ Buy | 15,000 | $1.75 | $26K | Direct | Mar 14, 2019 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
About Gregory K. Chow's insider trades
Gregory K. Chow is CFO at Sutro Biopharma (STRO). Since Mar 13, 2019, Gregory has reported 3 open-market purchases worth $56K and 1 sale worth $766K on SEC Form 4. There have been no open-market trades in the last 12 months.
Their filings also include grants and awards (6 filings), option exercises (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every STRO insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.