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Sutro Biopharma, Inc. (STRO)
NASDAQ: STRO · Real-Time Price · USD
Healthcare · Biotechnology
8.53-0.80 (-8.57%)
Insider Score
––Not scored
STRO Insider Score
Insiders here have filed 2 Form 4s in the last 90 days, but all of them are share awards, grants or other non-market transactions. Those are compensation, not a decision to buy, so they are not scored.
STRO Stock Insider Trading Activity
STRO stock’s insider trading shows no open-market insider trades by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Gerber Hans-Peter Other | Option exercise | 3,750 | — | — | 37.6% | 13,712 | Sep 18, 2026 | — | Form 4 |
| Gerber Hans-Peter Other | Tax withheld | 1,345 | $15.34 | $20.63K | 9.8% | 12,367 | Sep 18, 2026 | — | Form 4 |
| Chow Gregory K. CFO | Option exercise | 2,500 | — | — | 112% | 4,725 | Jun 2, 2026 | — | Form 4 |
| Pauling David Other | Option exercise | 675 | — | — | 7.2% | 10,025 | Mar 4, 2026 | — | Form 4 |
| Chung Jane CEO | Tax withheld | 282 | $21.31 | $6.01K | 1.3% | 21,285 | Mar 4, 2026 | — | Form 4 |
| Chung Jane CEO | Option exercise | 788 | — | — | 3.8% | 21,567 | Mar 4, 2026 | — | Form 4 |
| Pauling David Other | Tax withheld | 277 | $21.31 | $5.90K | 2.8% | 9,748 | Mar 4, 2026 | — | Form 4 |
| Gerber Hans-Peter Other | Option exercise | 2,843 | — | — | 36.2% | 10,688 | Mar 2, 2026 | — | Form 4 |
| Pauling David Other | Option exercise | 2,356 | — | — | 29.6% | 10,320 | Mar 2, 2026 | — | Form 4 |
| Pauling David Other | Tax withheld | 970 | $20.55 | $19.93K | 9.4% | 9,350 | Mar 2, 2026 | — | Form 4 |
| Chung Jane CEO | Option exercise | 7,750 | — | — | 49.0% | 23,558 | Mar 2, 2026 | — | Form 4 |
| Chung Jane CEO | Tax withheld | 2,779 | $20.55 | $57.11K | 11.8% | 20,779 | Mar 2, 2026 | — | Form 4 |
| Gerber Hans-Peter Other | Tax withheld | 1,170 | $20.55 | $24.04K | 10.9% | 9,518 | Mar 2, 2026 | — | Form 4 |
| Pauling David Other | Tax withheld | 551 | $20.47 | $11.28K | 6.5% | 7,964 | Mar 1, 2026 | — | Form 4 |
| Pauling David Other | Option exercise | 842 | — | — | 11.0% | 8,515 | Mar 1, 2026 | — | Form 4 |
| Pauling David Other | Option exercise | 500 | — | — | 7.0% | 7,673 | Mar 1, 2026 | — | Form 4 |
| Chung Jane CEO | Option exercise | 688 | — | — | 5.0% | 14,579 | Mar 1, 2026 | — | Form 4 |
| Chung Jane CEO | Option exercise | 2,500 | — | — | 17.1% | 17,079 | Mar 1, 2026 | — | Form 4 |
| Chung Jane CEO | Tax withheld | 1,271 | $20.47 | $26.02K | 7.4% | 15,808 | Mar 1, 2026 | — | Form 4 |
| Gerber Hans-Peter Other | Option exercise | 1,125 | — | — | 15.7% | 8,308 | Mar 1, 2026 | — | Form 4 |
| Gerber Hans-Peter Other | Tax withheld | 463 | $20.47 | $9.48K | 5.6% | 7,845 | Mar 1, 2026 | — | Form 4 |
| Chung Jane CEO | Option exercise | 2,500 | — | — | 20.4% | 14,785 | Dec 12, 2025 | — | Form 4 |
| Chung Jane CEO | Tax withheld | 894 | $8.02 | $7.17K | 6.0% | 13,891 | Dec 12, 2025 | — | Form 4 |
| Chung Jane CEO | Buy | 12,500 | $0.80 | $10.00K | 11.3% | 122,850 | Oct 15, 2025 | BCluster BuyFirst Buy | Form 4 |
| Pauling David Other | Buy | 12,504 | $0.80 | $10.00K | 21.1% | 71,737 | Oct 15, 2025 | BCluster BuyFirst Buy | Form 4 |
| MATSUI CONNIE Director | Buy | 50,000 | $0.80 | $40.00K | New | 50,000 | Oct 15, 2025 | ACluster BuyFirst Buy | Form 4 |
| Gerber Hans-Peter Other | Buy | 17,000 | $0.80 | $13.60K | 31.0% | 71,832 | Oct 15, 2025 | BCluster BuyFirst Buy | Form 4 |
| Chow Gregory K. CFO | Buy | 19,750 | $0.81 | $16.00K | New | 19,750 | Oct 15, 2025 | A+Cluster BuyFirst Buy | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Buy (P) — Open-market or private purchase
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
- Option exercise (M) — Exercise or conversion of an exempt derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.