UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Title of each class Trading Symbol Name of each exchange on which registered Common stock, $0.001 par value STRO The Nasdaq Stock Market LLC (Nasdaq Global Market) FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period ...

Exhibit 99.1 Sutro Biopharma Reports Second Quarter 2024 Financial Results, Business Highlights and Select Anticipated Milestones - Sutro will present updated data from the ongoing Phase 1b study of luvelta in combination with bevacizumab in a poster presentation at ESMO 2024; expansion study is ongoing with data expected in the first half of 2025 - - REFRαME-O1 Part 2 (randomized portion) of the Phase 3 trial of luvelta for treatment of platinum-resistant ovarian cancer (PROC) is underway - - REFRαME-P1, a ...

- Sutro will present updated data from the ongoing Phase 1b study of luvelta in combination with bevacizumab in a poster presentation at ESMO 2024; expansion study is ongoing with data expected in the first half of 2025 - - REFRαME-O1 Part 2 (randomized portion) of the Phase 3 trial of luvelta for treatment of platinum-resistant ovarian cancer (PROC) is underway - - REFRαME-P1, a registration-enabling trial of luvelta for pediatric patients with CBFA2T3::GLIS2 (CBF/GLIS; RAM phenotype) AML, is expected to b ...

"We are thrilled to welcome Dr. Leyman at a pivotal time for Sutro, as we advance luvelta in two registrationdirected trials in both ovarian cancer and a rare pediatric cancer and continue to leverage our proprietary cellfree technology to pioneer the next generation of ADCs," said Bill Newell, Sutro's Chief Executive Officer. "Dr. Leyman brings a strong track record of successful dealmaking, along with a depth of experience in the sector from her time as a life science investor and as a value creator withi ...

CONROE, Texas, June 3, 2024 /PRNewswire/ -- VGXI, Inc., a leading contract developer and manufacturer (CDMO) specializing in nucleic acid biopharmaceuticals, including gene therapies, DNA vaccines, and RNA medicines, has entered into a strategic partnership with Sutro Biopharma, Inc. (Sutro) to support clinical production of luveltamab tazevibulin, abbreviated as "luvelta", a novel Folate Receptor-α (FRα)-targeting antibody-drug conjugate (ADC) with the potential to address the unmet need in several FRα-exp ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ________ to ________ Commission File Number: 001-38662 SUTRO BIOPHARMA, INC. FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR (Exact Name of Registrant as Specified in its Charter) Delaware 47-0926186 (State ...

Exhibit 99.1 Sutro Biopharma Reports First Quarter 2024 Financial Results, Business Highlights and Select Anticipated Milestones - Investigational New Drug application for non-small cell lung cancer trial with luvelta cleared by U.S. Food and Drug Administration; Phase 2 on track to begin dosing in the second half of 2024 - - Patient expansion phase well underway in Phase 2 study of luvelta in combination with bevacizumab; enrollment is expected to complete in the first half of 2024 - - The randomized porti ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-38662 SUTRO BIOPHARMA, INC. (Exact Name of Registrant as Specified in Its Charter) (State or other jurisdiction of (I.R.S. Employer i ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ________ to ________ Commission File Number: 001-38662 SUTRO BIOPHARMA, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 47-0926186 (S ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ________ to ________ Commission File Number: 001-38662 SUTRO BIOPHARMA, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 47-0926186 (State or other jurisdiction of incorporation or organization) 111 Oyster Point Blvd, South San Francisco, California 94080 (Address of principal ...