Sutro Biopharma, Inc. (STRO) Stock

Sutro Biopharma, Inc. (STRO) is a Healthcare stock trading at $20.96 (as of 2026-08-21), with a market capitalization of $347.32M. Figures are sourced from first-party U.S. SEC EDGAR filings and market data.

Sutro Biopharma, Inc. operates as clinical stage drug discovery, development, and manufacturing company. It focuses on creating protein therapeutics for cancer and autoimmune disorders through integrated cell-free protein synthesis and site-specific conjugation platform, XpressCF+.The company's product candidates include STRO-001, an antibody-drug conjugate (ADC) directed against the cancer target CD74 for patients with multiple myeloma and non-Hodgkin lymphoma that is in Phase 1 clinical trials; and STRO-002, an ADC directed against folate receptor-alpha for patients with ovarian and endometrial cancers, which is in Phase 1 clinical trials. It has collaboration and license agreements with Merck Collaboration to develop research programs focusing on cytokine derivatives for cancer and autoimmune disorders; and Celgene Corporation to discover and develop bispecific antibodies and/or ADCs focused on the field of immuno-oncology. The company was formerly known as Fundamental Applied Biology, Inc. Sutro Biopharma, Inc. was incorporated in 2003 and is headquartered in South San Francisco, California.

Understand Sutro Biopharma, Inc.: how it makes money

Sutro Biopharma develops protein therapeutics for cancer and autoimmune disorders, using its integrated cell-free protein synthesis and site-specific conjugation platform (XpressCF+), and it makes money through its operating business, which was reported as 0.0B revenue in the latest quarter.

As a clinical-stage biotech, profitability depends on advancing its pipeline, since current reported revenue is essentially zero and the latest quarter shows a sharply negative operating margin.

Revenue by segment (latest quarter)
Revenue$0.0B

Business quality (Solid): Clarity is high on business model and pipeline stage, but the financial snapshot shows negligible reported revenue, so near term economics depend heavily on future clinical and commercialization progress.

Bull case

  • Focused platform for protein therapeutics: Sutro Biopharma builds cancer and autoimmune drug candidates using its integrated cell-free protein synthesis and site-specific conjugation platform, XpressCF+.
  • Advancing clinical pipeline: Its product candidates include STRO-001, an antibody-drug conjugate (ADC) against CD74 for multiple myeloma and non-Hodgkin lymphoma, in Phase 1 clinical trials.

Bear case

  • Minimal current revenue: For the quarter ended 2026-03-31, revenue is reported as 0.0B (gross margin is not provided), limiting evidence of commercial traction.
  • Large operating loss: The latest quarter operating margin is -204.2%, indicating substantial ongoing cost relative to revenue.
  • Early stage clinical uncertainty: The key cited candidate, STRO-001, is in Phase 1 clinical trials, which carries risk that later development may not succeed.
Valuation — source: SEC EDGAR (first-party)
Price$20.96
Market Cap$347.32M
Price / Sales7.15
Profitability & Growth — source: SEC EDGAR
Revenue (TTM)$102.48M
Net Margin-186.5%
Revenue Growth (YoY)65.2%
EPS Growth (YoY)659.8%
Financial Health — source: SEC EDGAR
Altman Z-Score-9.09 (distress)
Valuation vs Sector & Industry
Sector P/E (Healthcare)21.7
Industry P/E (Pharmaceutical Products)17.2
Smart-Money Activity — SEC Form 4 / 13F / Congressional disclosures
Top Institutional HolderBVF INC/IL ($31.18M)
Institutional Holders Tracked10
Company
SectorHealthcare
IndustryPharmaceutical Products
CEOJane Chung
Employees269
CountryUS
IPO Date2018-09-27

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STRO earnings history · STRO institutional & insider holders · STRO KPIs & operating metrics · STRO financials · STRO investor presentations & press releases · STRO SEC filings · STRO peers · Congress trades · Insider trades · Short interest · Stock screener

Data as of 2026-08-21.

Figures sourced from U.S. Securities and Exchange Commission (SEC EDGAR) filings and market data. Not personalized investment advice.