Sutro Biopharma, Inc. SEC filings STRO
Sutro Biopharma, Inc. has 624 filings in SEC EDGAR's recent list, going back to Nov 8, 2006. Its latest annual report, Form ARS, was filed on Apr 22, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 12, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 12, 2026 (results of operations, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Sep 22, 2026 | Sep 18, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 30, 2026 | — |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | Jun 2, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 1, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 21, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 21, 2026 | — |
| 4 | Insider transaction | Mar 6, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 6, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 1, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 1, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 1, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 18, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 13, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 13, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 29, 2026 | — |
| 144 | Notice of proposed sale | Jan 20, 2026 | — |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 23, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 23, 2025 | — |
| 4 | Insider transaction | Oct 16, 2025 | Oct 15, 2025 |
| 4 | Insider transaction | Oct 16, 2025 | Oct 15, 2025 |
| 4 | Insider transaction | Oct 16, 2025 | Oct 15, 2025 |
| 4 | Insider transaction | Oct 16, 2025 | Oct 15, 2025 |
| 4 | Insider transaction | Oct 16, 2025 | Oct 15, 2025 |
| 4 | Insider transaction | Sep 22, 2025 | Sep 18, 2025 |
| 3/A | Filing | Sep 12, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Aug 26, 2025 | Jul 8, 2025 |
| 4 | Insider transaction | Aug 26, 2025 | Aug 9, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 29, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 16, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 30, 2025 | — |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | Jun 2, 2025 |
| 3 | Initial insider ownership | Jun 2, 2025 | Jun 2, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 15, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2025 | — |
| 4 | Insider transaction | May 5, 2025 | May 1, 2025 |
| 4 | Insider transaction | May 5, 2025 | May 1, 2025 |
| 4 | Insider transaction | May 5, 2025 | May 1, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 17, 2025 | — |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 8, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 8, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 8, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 8, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 8, 2025 | Apr 4, 2025 |
| 3 | Initial insider ownership | Apr 8, 2025 | Apr 4, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 4, 2025 | — |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Mar 1, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Feb 28, 2025 |
| 4 | Insider transaction | Dec 3, 2024 | Dec 1, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 4, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 4, 2024 | — |
| 4 | Insider transaction | Sep 20, 2024 | Sep 18, 2024 |
| 4 | Insider transaction | Aug 13, 2024 | Aug 9, 2024 |
| 4 | Insider transaction | Aug 12, 2024 | Aug 8, 2024 |
| 3 | Initial insider ownership | Aug 12, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Jul 10, 2024 | Jul 8, 2024 |
| 3 | Initial insider ownership | Jul 10, 2024 | Jul 8, 2024 |
| 4 | Insider transaction | Jun 10, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 10, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 10, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 10, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 10, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 10, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 10, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | Jun 10, 2024 | Jun 6, 2024 |
| 4 | Insider transaction | May 3, 2024 | May 1, 2024 |
| 4 | Insider transaction | Apr 12, 2024 | Apr 11, 2024 |
| SC 13G | Ownership over 5% (passive) | Apr 5, 2024 | — |
| 4/A | Filing | Mar 22, 2024 | Mar 5, 2024 |
| 4/A | Filing | Mar 22, 2024 | Mar 5, 2024 |
| 4/A | Filing | Mar 22, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Mar 4, 2024 | Feb 29, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 7, 2024 | — |
| 4 | Insider transaction | Jan 31, 2024 | Jan 29, 2024 |
| 4 | Insider transaction | Jan 31, 2024 | Jan 29, 2024 |
| 4 | Insider transaction | Jan 31, 2024 | Jan 29, 2024 |
| 4 | Insider transaction | Jan 31, 2024 | Jan 29, 2024 |
| 144 | Notice of proposed sale | Jan 29, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 24, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Jan 17, 2024 | — |
| 4 | Insider transaction | Dec 4, 2023 | Dec 1, 2023 |
| SC 13G | Ownership over 5% (passive) | Oct 10, 2023 | — |
| 4 | Insider transaction | Sep 19, 2023 | Sep 18, 2023 |
| 3 | Initial insider ownership | Sep 19, 2023 | Sep 18, 2023 |
| 4 | Insider transaction | Aug 29, 2023 | Aug 28, 2023 |
| 4 | Insider transaction | Aug 28, 2023 | Aug 25, 2023 |
| 144 | Notice of proposed sale | Aug 25, 2023 | — |
| 4 | Insider transaction | Aug 11, 2023 | Aug 9, 2023 |
| 4 | Insider transaction | Jul 13, 2023 | Jul 12, 2023 |
| 4 | Insider transaction | Jun 29, 2023 | Jun 27, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 8, 2023 |
| 4 | Insider transaction | May 2, 2023 | May 1, 2023 |
| 3 | Initial insider ownership | May 2, 2023 | May 1, 2023 |
| 4 | Insider transaction | Apr 17, 2023 | Apr 14, 2023 |
| 4 | Insider transaction | Mar 17, 2023 | Mar 15, 2023 |
| 4 | Insider transaction | Mar 7, 2023 | Mar 3, 2023 |
| 4 | Insider transaction | Mar 7, 2023 | Mar 3, 2023 |
| 3 | Initial insider ownership | Mar 7, 2023 | Mar 1, 2023 |
| 3 | Initial insider ownership | Mar 7, 2023 | Feb 28, 2023 |
| 4 | Insider transaction | Mar 7, 2023 | Mar 3, 2023 |
| 4 | Insider transaction | Mar 7, 2023 | Mar 3, 2023 |
| 4 | Insider transaction | Mar 7, 2023 | Mar 3, 2023 |
| 4 | Insider transaction | Mar 7, 2023 | Mar 3, 2023 |
| 4 | Insider transaction | Mar 7, 2023 | Mar 3, 2023 |
| 4 | Insider transaction | Mar 7, 2023 | Mar 3, 2023 |
| 4 | Insider transaction | Feb 14, 2023 | Feb 13, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Feb 10, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 7, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 1, 2023 | — |
| 4 | Insider transaction | Jan 31, 2023 | Jan 27, 2023 |
| 4 | Insider transaction | Jan 31, 2023 | Jan 27, 2023 |
| 4 | Insider transaction | Jan 31, 2023 | Jan 27, 2023 |
| 4 | Insider transaction | Jan 31, 2023 | Jan 27, 2023 |
| 4 | Insider transaction | Jan 31, 2023 | Jan 27, 2023 |
| 4 | Insider transaction | Jan 31, 2023 | Jan 27, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 23, 2023 | — |
| 4 | Insider transaction | Aug 10, 2022 | Aug 9, 2022 |
| 4 | Insider transaction | Jul 13, 2022 | Jul 12, 2022 |
| SC 13G | Ownership over 5% (passive) | Jul 8, 2022 | — |
| 4 | Insider transaction | Jun 8, 2022 | Jun 6, 2022 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Biological Products, (No Diagnostic Substances) (SIC 2836)
- Listed as
- STRO (Nasdaq)
- Fiscal year ends
- December 31
- Headquarters
- South San Francisco, CA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1382101
- Former names
- SUTRO BIOPHARMA INC (until Nov 8, 2018); Fundamental Applied Biology Inc (until Oct 24, 2007)
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All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.