Company profile
Sutro Biopharma, Inc. Insider Trading
STROEvery SEC Form 4 insider trading filing for Sutro Biopharma, Inc. (STRO) since April 2023: open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- Nasdaq
- Sector
- Biological Products, (No Diagnostic Substances)
- CIK
- 0001382101
- Filings
- 125
- Insiders
- 22
- Last filing
- 2026-09-18
Activity summary
Recent insider activity is bullish. Over the last 30 days, 2 insiders purchased shares versus 1 sale. Buying was led by Hans-Peter Gerber.
Three year balance
Buy and sell value by quarter, Q4 23 to Q3 26. Sutro Biopharma, Inc. insiders are net sellers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $376K.
90 day insight
Over the last 90 days, Sutro Biopharma, Inc. insiders bought $0 (2 transactions) and sold $21K (1 transaction).
- Most active insider: Hans-Peter Gerber with 3 transactions totaling $21K.
- Largest single sale: $21K by Hans-Peter Gerber on Sep 18, 2026.
Activity skews bullish: buys outpace sales.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 18, 2026 | Hans-Peter Gerber | STRO | Option Exercise | 3,750 | — | — |
| Sep 18, 2026 | Hans-Peter Gerber | STRO | Tax Withholding | 1,345 | $15.34 | $21K |
| Sep 18, 2026 | Hans-Peter Gerber | STRO | Option Exercise | 3,750 | — | — |
| Jun 5, 2026 | Heidi Hunter | STRO | Award | 10,000 | — | — |
| Jun 5, 2026 | Michael Dybbs | STRO | Award | 10,000 | — | — |
45 more transactions hidden
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-H "X-Api-Key: $KEY"Top insiders
By total value filed.
Institutional Ownership
Top 13F-HR holders of Sutro Biopharma, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings: institutional holders report positions within 45 days of quarter end. Joined with insider activity above: see who's loading up institutionally while insiders are trading. Full 13F-HR API →