Sutro Biopharma, Inc.
STRO- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001382101
No open-market purchases or sales by Sutro Biopharma, Inc. insiders were filed in the last 90 days; 100 institutions reported holding it in 13F filings for Q2 2026, worth $545.7M in total; no superinvestor holds it.
13F holders, Q3 2026
Institutional positions in Sutro Biopharma, Inc. as of Sep 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
Q3 2026 data is still coming in (13F filing deadline: Nov 16, 2026), so these numbers are incomplete.
- Institutional holders
- 60
- +3 vs. Q2 2026
- Shares held
- 6.98M
- +272.1K (+4.1%) vs. Q2 2026
- Total value
- $112.3M
- −$110.5M (−49.6%) vs. Q2 2026
- New holders
- 12
- 21 more added
- Sold out
- 9
- 11 more reduced
43 institutions that held it in Q2 2026 haven't filed for Q3 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting STRO on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 100 | $545.7M |
| Q1 2026 | 78 | $358.3M |
| Q4 2025 | 65 | $64.8M |
| Q3 2025 | 88 | $46.4M |
| Q2 2025 | 101 | $39.6M |
| Q1 2025 | 113 | $40.0M |
| Q4 2024 | 123 | $117.6M |
| Q3 2024 | 130 | $216.4M |
| Q2 2024 | 119 | $185.1M |
| Q1 2024 | 117 | $301.7M |
| Q4 2023 | 114 | $238.7M |
| Q3 2023 | 109 | $194.3M |
| Q2 2023 | 120 | $251.6M |
| Q1 2023 | 116 | $247.5M |
| Q4 2022 | 119 | $403.7M |
| Q3 2022 | 113 | $279.6M |
| Q2 2022 | 115 | $240.9M |
| Q1 2022 | 114 | $342.2M |
| Q4 2021 | 117 | $593.2M |
| Q3 2021 | 120 | $752.5M |
| Q2 2021 | 124 | $766.7M |
| Q1 2021 | 138 | $1.01B |
Institutions, Q3 2026
Shares, value and share of portfolio for each institution holding Sutro Biopharma, Inc.; share changes are against Q2 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 1,178,196 | $19.0M | 0.00% | +55,541+4.9% | Added |
| Affinity Asset Advisors, LLC | 1,152,487 | $18.6M | 1.05% | −20,000−1.7% | Reduced |
| Vanguard Capital Management LLC | 676,926 | $10.9M | 0.00% | −17,293−2.5% | Reduced |
| Acadian Asset Management LLC | 557,868 | $8.98M | 0.01% | +184,029+49.2% | Added |
| Qube Research & Technologies Ltd | 379,290 | $6.11M | 0.01% | +272,680+255.8% | Added |
| Geode Capital Management, LLC | 365,851 | $5.90M | 0.00% | −23,841−6.1% | Reduced |
| State Street Corp | 324,477 | $5.23M | 0.00% | +18,498+6.0% | Added |
| Marshall Wace, LLP | 317,964 | $5.12M | 0.00% | +142,718+81.4% | Added |
| Vanguard Portfolio Management LLC | 282,764 | $4.56M | 0.00% | +85,202+43.1% | Added |
| Merck & Co., Inc. | 272,351 | $4.39M | 0.53% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 225,840 | $3.64M | 0.00% | +66,213+41.5% | Added |
| FMR LLC | 171,245 | $2.76M | 0.00% | +169,906+12,689.0% | Added |
| UBS Group AG | 115,058 | $1.85M | 0.00% | −93,454−44.8% | Reduced |
| Vanguard Fiduciary Trust Co | 100,036 | $1.61M | 0.00% | −4,196−4.0% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 90,536 | $1.46M | 0.03% | +34,657+62.0% | Added |
| Renaissance Technologies LLC | 87,247 | $1.41M | 0.00% | +923+1.1% | Added |
| Mackenzie Financial Corp | 68,513 | $1.10M | 0.00% | −26,254−27.7% | Reduced |
| Invesco Ltd. | 64,885 | $1.05M | 0.00% | +7,580+13.2% | Added |
| BNP Paribas Arbitrage, SA | 62,306 | $1.00M | 0.00% | +34,923+127.5% | Added |
| Morgan Stanley | 55,238 | $889.9K | 0.00% | +42,882+347.1% | Added |
| Barclays PLC | 51,098 | $823.2K | 0.00% | +14,144+38.3% | Added |
| Bank of New York Mellon Corp | 41,369 | $666.5K | 0.00% | 00.0% | Unchanged |
| Fisher Asset Management, LLC | 35,295 | $568.6K | 0.00% | 00.0% | Unchanged |
| Nuveen, LLC | 34,872 | $561.8K | 0.00% | −133,125−79.2% | Reduced |
| Squarepoint Ops LLC | 28,193 | $454.2K | 0.00% | −27,346−49.2% | Reduced |
| Los Angeles Capital Management LLC | 26,706 | $430.2K | 0.00% | +26,706 | New |
| Massachusetts Financial Services Co | 25,850 | $416.4K | 0.00% | +25,850 | New |
| Rhumbline Advisers | 21,525 | $346.8K | 0.00% | +897+4.3% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 17,051 | $274.7K | 0.00% | +17,051 | New |
| Quadrature Capital Ltd | 16,866 | $271.7K | 0.00% | +16,866 | New |
| RBF Capital, LLC | 15,272 | $246.0K | 0.01% | 00.0% | Unchanged |
| TD Asset Management Inc | 14,554 | $234.3K | 0.00% | +14,554 | New |
| Deutsche Bank AG | 13,603 | $219.1K | 0.00% | −1,960−12.6% | Reduced |
| Franklin Resources Inc | 21,774 | $216.4K | 0.00% | +21,774 | New |
| Jump Financial, LLC | 12,900 | $207.8K | 0.00% | +12,900 | New |
| Achmea Investment Management B.V. | 12,198 | $196.7K | 0.00% | +12,198 | New |
| SEI Investments Co | 10,962 | $176.6K | 0.00% | −5,425−33.1% | Reduced |
| Persistent Asset Partners Ltd | 9,409 | $151.6K | 0.04% | +2,840+43.2% | Added |
| Vanguard Global Advisers, LLC | 5,508 | $88.7K | 0.00% | +63+1.2% | Added |
| Police & Firemen's Retirement System of New Jersey | 4,704 | $75.8K | 0.00% | 00.0% | Unchanged |
| Employees Retirement System of Texas | 4,679 | $75.0K | 0.00% | +4,679 | New |
| State of Wyoming | 2,082 | $33.5K | 0.00% | +464+28.7% | Added |
| Ameritas Investment Partners, Inc. | 1,448 | $23.3K | 0.00% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 1,442 | $23.2K | 0.00% | +167+13.1% | Added |
| Citigroup Inc | 1,189 | $19.2K | 0.00% | −6,267−84.1% | Reduced |
| FNY Investment Advisers, LLC | 1,000 | $16.0K | 0.00% | 00.0% | Unchanged |
| Owl Creek Wealth Partners LLC | 491 | $7.91K | 0.00% | 00.0% | Unchanged |
| Sterling Capital Management LLC | 317 | $5.11K | 0.00% | +36+12.8% | Added |
| California State Teachers Retirement System | 220 | $3.54K | 0.00% | 00.0% | Unchanged |
| UMA Financial Services, Inc. | 182 | $2.93K | 0.00% | 00.0% | Unchanged |
| GAMMA Investing LLC | 140 | $2.25K | 0.00% | +140 | New |
| Advisor Group Holdings, Inc. | 100 | $1.61K | 0.00% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 67 | $1.08K | 0.00% | +51+318.8% | Added |
| Fortitude Family Office, LLC | 56 | $902 | 0.00% | 00.0% | Unchanged |
| Bogart Wealth, LLC | 50 | $806 | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 44 | $709 | 0.00% | 00.0% | Unchanged |
| Root Financial Partners, LLC | 4 | $64 | 0.00% | +4 | New |
| Fifth Third Bancorp | 2 | $32 | 0.00% | 00.0% | Unchanged |
| Steward Partners Investment Advisory, LLC | 2 | $32 | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 1 | $16 | 0.00% | +1 | New |
| Eventide Asset Management, LLC | 0 | $0 | 0.00% | −585,262−100.0% | Sold out |
| Sigma Planning Corp | 0 | $0 | 0.00% | −45,020−100.0% | Sold out |
| Walleye Capital LLC | 0 | $0 | 0.00% | −9,306−100.0% | Sold out |
| Integrated Quantitative Investments LLC | 0 | $0 | 0.00% | −8,939−100.0% | Sold out |
| State Board of Administration of Florida Retirement System | 0 | $0 | 0.00% | −7,001−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −201−100.0% | Sold out |
| The PNC Financial Services Group, Inc. | 0 | $0 | 0.00% | −62−100.0% | Sold out |
| Parallel Advisors, LLC | 0 | $0 | 0.00% | −47−100.0% | Sold out |
| Avion Wealth | 0 | $0 | 0.00% | −46−100.0% | Sold out |
| Perceptive Advisors LLC | – | – | – | – | Not filed |
| BVF Inc | – | – | – | – | Not filed |
| Samsara BioCapital, LLC | – | – | – | – | Not filed |
| Kynam Capital Management, LP | – | – | – | – | Not filed |
| OrbiMed Advisors LLC | – | – | – | – | Not filed |
| Balyasny Asset Management LLC | – | – | – | – | Not filed |
| Velan Capital Investment Management LP | – | – | – | – | Not filed |
| Woodline Partners LP | – | – | – | – | Not filed |
| ADAR1 Capital Management, LLC | – | – | – | – | Not filed |
| Millennium Management LLC | – | – | – | – | Not filed |
| Acuta Capital Partners, LLC | – | – | – | – | Not filed |
| Ameriprise Financial Inc | – | – | – | – | Not filed |
| Point72 Asset Management, L.P. | – | – | – | – | Not filed |
| KVP Capital Advisors, LP | – | – | – | – | Not filed |
| Two Sigma Investments, LP | – | – | – | – | Not filed |
| Goldman Sachs Group Inc | – | – | – | – | Not filed |
| Northern Trust Corp | – | – | – | – | Not filed |
| Seven Fleet Capital Management LP | – | – | – | – | Not filed |
| Citadel Advisors LLC | – | – | – | – | Not filed |
| XTX Topco Ltd | – | – | – | – | Not filed |
| Charles Schwab Investment Management Inc | – | – | – | – | Not filed |
| Bank of America Corp | – | – | – | – | Not filed |
| Elmind Capital, LP | – | – | – | – | Not filed |
| D. E. Shaw & Co., Inc. | – | – | – | – | Not filed |
| Trexquant Investment LP | – | – | – | – | Not filed |
| Gsa Capital Partners LLP | – | – | – | – | Not filed |
| EAM Investors, LLC | – | – | – | – | Not filed |
| Price T Rowe Associates Inc | – | – | – | – | Not filed |
| Wells Fargo & Company | – | – | – | – | Not filed |
| Wellington Management Group LLP | – | – | – | – | Not filed |
| MetLife Investment Management | – | – | – | – | Not filed |