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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, 20268-KResults of OperationsMay 14, 20268-KAgreement Terminated · Results of OperationsMar 23, 20268-KMaterial Agreement · Reg FD DisclosureFeb 10, 20268-KCompany UpdateDec 17, 20258-KSecurity-Holder Rights · Bylaw AmendmentDec 3, 20258-KResults of OperationsNov 6, 20258-KExit / Disposal CostsSep 29, 20258-KResults of OperationsAug 7, 20258-KDelisting NoticeJun 25, 20258-KShareholder VoteJun 10, 20258-KExecutive ChangeJun 2, 20258-KResults of OperationsMay 8, 20258-KExecutive ChangeApr 14, 20258-KExecutive Change · Results of OperationsMar 13, 20258-KCompany UpdateDec 10, 20248-KResults of OperationsNov 13, 20248-KResults of OperationsAug 13, 20248-KExecutive ChangeAug 12, 20248-KShareholder VoteJun 10, 20248-KResults of OperationsMay 13, 20248-KMaterial AgreementApr 2, 20248-KMaterial Agreement · Equity IssuanceApr 2, 20248-KResults of OperationsMar 25, 20248-KCompany UpdateFeb 9, 20248-KResults of Operations · Reg FD DisclosureJan 8, 20248-KMaterial AgreementNov 27, 20238-KExecutive Change · Reg FD DisclosureNov 21, 20238-KResults of OperationsNov 13, 20238-KMaterial AgreementOct 4, 20238-KResults of OperationsAug 10, 20238-KMaterial AgreementJun 26, 20238-KAgreement Terminated · Shareholder VoteJun 14, 20238-KResults of OperationsMay 15, 20238-KExecutive ChangeApr 27, 20238-KExecutive ChangeApr 14, 20238-KResults of OperationsMar 30, 20238-KBylaw AmendmentFeb 24, 20238-KReg FD Disclosure · Company UpdateJan 9, 20238-KMaterial AgreementDec 20, 20228-KResults of OperationsNov 8, 20228-KExecutive ChangeOct 24, 20228-KResults of OperationsAug 8, 20228-KCompany UpdateJul 26, 20228-KMaterial Agreement · Company UpdateJun 28, 20228-KCompany UpdateJun 16, 20228-KShareholder VoteJun 7, 20228-KResults of OperationsMay 9, 20228-KMaterial AgreementApr 20, 20228-KResults of OperationsFeb 28, 20228-KReg FD DisclosureJan 10, 20228-KReg FD Disclosure · Company UpdateJan 5, 20228-KMaterial AgreementDec 27, 20218-KExecutive ChangeNov 17, 20218-KResults of Operations · Reg FD DisclosureNov 10, 20218-KMaterial AgreementOct 12, 20218-KCompany UpdateSep 30, 20218-KResults of OperationsAug 9, 20218-KMaterial Agreement · New Debt / ObligationJun 17, 20218-KShareholder VoteJun 4, 20218-KReg FD DisclosureMay 19, 20218-KResults of OperationsMay 7, 20218-KCompany UpdateApr 15, 20218-KResults of OperationsMar 18, 20218-KMaterial AgreementDec 9, 20208-KReg FD Disclosure · Company UpdateDec 7, 20208-KReg FD Disclosure · Company UpdateDec 4, 20208-KExecutive ChangeDec 1, 20208-KResults of OperationsNov 5, 20208-KCompany UpdateSep 9, 20208-KMaterial Agreement · New Debt / ObligationSep 4, 20208-KResults of OperationsAug 6, 20208-KReg FD DisclosureJun 15, 20208-KShareholder VoteJun 5, 20208-KMaterial AgreementMay 12, 20208-KResults of OperationsMay 11, 20208-KResults of Operations · Reg FD DisclosureApr 27, 20208-KResults of OperationsMar 16, 20208-KMaterial Agreement · New Debt / ObligationMar 3, 20208-KExecutive ChangeJan 8, 2020
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.
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