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 | — |
| 10-Q | Quarterly report | Aug 12, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 12, 2026 | Aug 12, 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 |
| 8-K |
Current report
Shareholder vote results
|
Jun 8, 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 | — |
| 10-Q | Quarterly report | May 14, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 14, 2026 | May 14, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 1, 2026 | — |
| ARS | Annual report to shareholders | Apr 22, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 22, 2026 | — |
| DEF 14A | Proxy statement | Apr 22, 2026 | Jun 5, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 21, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 21, 2026 | — |
| EFFECT | Filing | Apr 1, 2026 | — |
| 424B3 | Prospectus | Apr 1, 2026 | — |
| CORRESP | Letter to the SEC | Mar 30, 2026 | — |
| UPLOAD | Letter from the SEC | Mar 27, 2026 | — |
| S-3 | Shelf registration | Mar 23, 2026 | — |
| S-8 | Employee stock plan registration | Mar 23, 2026 | — |
| 10-K | Annual report | Mar 23, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Agreement ended, Results of operations
|
Mar 23, 2026 | Mar 23, 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 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Feb 10, 2026 | Feb 9, 2026 |
| 424B5 | Prospectus supplement | Feb 10, 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 |
| 8-K |
Current report
Other events
|
Dec 17, 2025 | Dec 17, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 12, 2025 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Other events
|
Dec 3, 2025 | Dec 1, 2025 |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2025 | Nov 6, 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 |
| 8-K |
Current report
Exit or restructuring costs
|
Sep 29, 2025 | Sep 29, 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 | — |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2025 | Aug 7, 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 | — |
| 8-K |
Current report
Listing notice
|
Jun 25, 2025 | Jun 20, 2025 |
| 8-K |
Current report
Shareholder vote results
|
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 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 2, 2025 | Jun 2, 2025 |
| 3 | Initial insider ownership | Jun 2, 2025 | Jun 2, 2025 |
| 8-K |
Current report
Officer or director change
|
Jun 2, 2025 | Jun 2, 2025 |
| S-8 | Employee stock plan registration | May 30, 2025 | — |
| 4 | Insider transaction | May 19, 2025 | May 15, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2025 | — |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 8, 2025 | May 8, 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 |
| ARS | Annual report to shareholders | Apr 25, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 25, 2025 | — |
| DEF 14A | Proxy statement | Apr 25, 2025 | Jun 6, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 17, 2025 | — |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| PRE 14A | Preliminary proxy statement | Apr 14, 2025 | Jun 6, 2025 |
| 8-K |
Current report
Officer or director change
|
Apr 14, 2025 | Apr 10, 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 | — |
| 10-K | Annual report | Mar 13, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations, Exit or restructuring costs, Officer or director change
|
Mar 13, 2025 | Mar 13, 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 |
| S-8 | Employee stock plan registration | Feb 27, 2025 | — |
| 8-K |
Current report
Other events
|
Dec 10, 2024 | Dec 10, 2024 |
| 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 | — |
| 10-Q | Quarterly report | Nov 13, 2024 | Sep 30, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| 8-K |
Current report
Results of operations
|
Nov 13, 2024 | 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 |
| 10-Q | Quarterly report | Aug 13, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2024 | Aug 13, 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 |
| 8-K |
Current report
Officer or director change
|
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 |
| 8-K |
Current report
Shareholder vote results
|
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 |
| DEFA14A | Additional proxy material | May 17, 2024 | — |
| 10-Q | Quarterly report | May 13, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 13, 2024 | May 13, 2024 |
| 4 | Insider transaction | May 3, 2024 | May 1, 2024 |
| ARS | Annual report to shareholders | Apr 26, 2024 | Dec 31, 2023 |
| DEF 14A | Proxy statement | Apr 26, 2024 | Jun 6, 2024 |
| DEFA14A | Additional proxy material | Apr 26, 2024 | — |
| 4 | Insider transaction | Apr 12, 2024 | Apr 11, 2024 |
| SC 13G | Ownership over 5% (passive) | Apr 5, 2024 | — |
| 8-K |
Current report
Material agreement
|
Apr 2, 2024 | Apr 2, 2024 |
| 424B5 | Prospectus supplement | Apr 2, 2024 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure
|
Apr 2, 2024 | Mar 29, 2024 |
| 10-K | Annual report | Mar 25, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 25, 2024 | Mar 25, 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 |
| S-8 | Employee stock plan registration | Feb 27, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2024 | — |
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.