← The Wire
STRONasdaq
SUTRO BIOPHARMA, INC.
Biological Products, (No Diagnostic Substances) · CIK 1382101
Developing site-specific antibody drug conjugates for oncology using proprietary cell-free protein synthesis platforms
$477M
Market cap
$33.35
Last close
+9.3%
1D
+5.7%
5D
465K
Volume
Price · last 39 sessions-13.1%
May 4L $24.43 · H $40.91Jun 29
167
Total filings
Jun 8, 2026
Last filing
12/31
Fiscal year end
8-KShareholder VoteJun 8, 202610-Q10-QMay 14, 20268-KResults of OperationsMay 14, 2026DEFA14ADEFA14AApr 22, 2026DEF 14ADEF 14AApr 22, 202610-K10-KMar 23, 20268-KAgreement Terminated · Results of OperationsMar 23, 20268-KMaterial Agreement · Reg FD DisclosureFeb 10, 2026424B5424B5Feb 10, 20268-KCompany UpdateDec 17, 20258-KSecurity-Holder Rights · Bylaw AmendmentDec 3, 202510-Q10-QNov 6, 20258-KResults of OperationsNov 6, 20258-KExit / Disposal CostsSep 29, 202510-Q10-QAug 7, 20258-KResults of OperationsAug 7, 20258-KDelisting NoticeJun 25, 20258-KShareholder VoteJun 10, 20258-KExecutive ChangeJun 2, 202510-Q10-QMay 8, 20258-KResults of OperationsMay 8, 2025DEFA14ADEFA14AApr 25, 2025DEF 14ADEF 14AApr 25, 20258-KExecutive ChangeApr 14, 202510-K10-KMar 13, 20258-KExecutive Change · Results of OperationsMar 13, 20258-KCompany UpdateDec 10, 202410-Q10-QNov 13, 20248-KResults of OperationsNov 13, 202410-Q10-QAug 13, 20248-KResults of OperationsAug 13, 20248-KExecutive ChangeAug 12, 20248-KShareholder VoteJun 10, 2024DEFA14ADEFA14AMay 17, 202410-Q10-QMay 13, 20248-KResults of OperationsMay 13, 2024DEF 14ADEF 14AApr 26, 2024DEFA14ADEFA14AApr 26, 2024SC 13GSC 13GApr 5, 20248-KMaterial AgreementApr 2, 2024424B5424B5Apr 2, 20248-KMaterial Agreement · Equity IssuanceApr 2, 202410-K10-KMar 25, 20248-KResults of OperationsMar 25, 20248-KCompany UpdateFeb 9, 2024424B5424B5Feb 9, 2024SC 13GSC 13GJan 17, 20248-KResults of Operations · Reg FD DisclosureJan 8, 20248-KMaterial AgreementNov 27, 20238-KExecutive Change · Reg FD DisclosureNov 21, 202310-Q10-QNov 13, 20238-KResults of OperationsNov 13, 2023SC 13GSUTRO BIOPHARMA, INC.Oct 10, 20238-KMaterial AgreementOct 4, 202310-Q10-QAug 10, 20238-KResults of OperationsAug 10, 20238-KMaterial AgreementJun 26, 20238-KAgreement Terminated · Shareholder VoteJun 14, 202310-Q10-QMay 15, 20238-KResults of OperationsMay 15, 2023DEFA14ADEFA14AApr 28, 2023DEF 14ADEF 14AApr 28, 20238-KExecutive ChangeApr 27, 20238-KExecutive ChangeApr 14, 20238-KResults of OperationsMar 30, 202310-K10-KMar 30, 20238-KBylaw AmendmentFeb 24, 2023SC 13GSC 13GFeb 10, 20238-KReg FD Disclosure · Company UpdateJan 9, 20238-KMaterial AgreementDec 20, 202210-Q10-QNov 8, 20228-KResults of OperationsNov 8, 20228-KExecutive ChangeOct 24, 202210-Q10-QAug 8, 20228-KResults of OperationsAug 8, 20228-KCompany UpdateJul 26, 2022SC 13GSC 13GJul 8, 20228-KMaterial Agreement · Company UpdateJun 28, 20228-KCompany UpdateJun 16, 20228-KShareholder VoteJun 7, 2022
Insider Activity
◆ Cluster Buy · 5 insidersIn the 90 days to Oct 15, 2025: 5 insiders bought $90K.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Oct 15, 2025 | Matsui ConnieDirector | Buy | 50,000 | $0.80 | $40K |
| Oct 15, 2025 | Chow Gregory K.CFO | Buy | 19,750 | $0.81 | $16K |
| Oct 15, 2025 | Gerber Hans-PeterCHIEF SCIENTIFIC OFFICER | Buy | 17,000 | $0.80 | $14K |
| Oct 15, 2025 | Pauling DavidChief Admin. Ofcr. & GC | Buy | 12,504 | $0.80 | $10K |
| Oct 15, 2025 | Chung JaneChief Executive Officer | Buy | 12,500 | $0.80 | $10K |
Open-market buys & sells (Form 4, transaction codes P/S). Source: SEC structured insider data.
Similar companies
Comparable business profile · signals at a glance