STRONasdaqBiological Products, (No Diagnostic Substances)Fiscal year ends December 31
SUTRO BIOPHARMA, INC.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 12, 2026
$11.26+0.32 (+2.88%)
Close on Oct 19, 2026
- Market cap
- $186.51M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
99.4%
16M of 17M shares
Institutional holders
97
41 new, 14 sold out
Net institutional buying
2M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Point72 Asset Management, L.P. | 946,829 | 5.70% | 13G (passive) | Apr 24, 2026 |
| Perceptive Life Sciences Master Fund, Ltd. | 898,025 | 5.40% | 13G (passive) | Apr 14, 2026 |
| Michael Cho | 748,382 | 8.80% | 13G (passive) amendment | Jan 22, 2026 |
| Israel A. Englander | 4,717,215 | 5.60% | 13G (passive) | Jun 27, 2025 |
| Adage Capital Partners, L.P. | 4,467,796 | 7.33% | 13G (passive) amendment | Dec 31, 2023 |
| Rajeev Shah | 4,434,637 | 5.30% | 13G (passive) | Mar 28, 2025 |
| Joseph Edelman | 1,304,846 | 7.90% | 13G (passive) amendment | Jun 30, 2026 |
| Lampert Mark N | 1,251,788 | 7.60% | 13G (passive) | Feb 10, 2026 |
| Affinity Asset Advisors, LLC | 1,069,519 | 6.50% | 13G (passive) amendment | Mar 31, 2026 |
| BlackRock, Inc. | 1,065,366 | 6.40% | 13G (passive) | Jun 30, 2026 |
| Srinivas Akkaraju | 1,062,872 | 6.40% | 13G (passive) | Feb 11, 2026 |
| Kynam Capital Management, LP | 0 | 6.44% | 13G (passive) | Mar 31, 2025 |
| Kynam Capital Management GP, LLC | 0 | 5.27% | 13G (passive) amendment | Mar 31, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of STRO | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Perceptive Advisors LLC | 1,304,846 | 7.87% | $43.32M | +589,539 | 0.65% |
| Bvf Inc/Il | 1,251,788 | 7.55% | $41.56M | – | 1.06% |
| Affinity Asset Advisors, LLC | 1,172,487 | 7.07% | $38.93M | +102,968 | 1.76% |
| BlackRock, Inc. | 1,122,655 | 6.77% | $37.27M | +889,971 | 0.00% |
| Samsara BioCapital, LLC | 1,062,872 | 6.41% | $35.29M | – | 2.90% |
| Kynam Capital Management, LP | 872,558 | 5.26% | $28.97M | – | 1.60% |
| Orbimed Advisors LLC | 743,944 | 4.49% | $24.70M | −57,200 | 0.46% |
| Balyasny Asset Management L.P. | 711,162 | 4.29% | $23.61M | +245,370 | 0.03% |
| Vanguard Capital Management LLC | 694,219 | 4.19% | $23.05M | −26,223 | 0.00% |
| Eventide Asset Management, LLC | 585,262 | 3.53% | $19.43M | −130,045 | 0.26% |
| Velan Capital Investment Management LP | 512,160 | 3.09% | $17.00M | – | 10.36% |
| Woodline Partners LP | 458,029 | 2.76% | $15.21M | +588 | 0.05% |
| ADAR1 Capital Management, LLC | 404,014 | 2.44% | $13.41M | −120,427 | 0.61% |
| Geode Capital Management, LLC | 389,692 | 2.35% | $12.94M | +218,306 | 0.00% |
| Acadian Asset Management LLC | 373,839 | 2.25% | $12.41K | +38,026 | 0.01% |
| Millennium Management LLC | 365,972 | 2.21% | $12.15M | +155,594 | 0.00% |
| State Street Corp | 305,979 | 1.85% | $10.16M | +253,861 | 0.00% |
| Merck & Co., Inc. | 272,351 | 1.64% | $9.04M | New | 1.72% |
| Acuta Capital Partners, LLC | 270,251 | 1.63% | $8.97M | +826 | 6.25% |
| Ameriprise Financial Inc | 244,669 | 1.48% | $8.12M | New | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 97 | 16M | 99.4% | 41 / 24 | 18 / 14 | 5M | 3M |
| Q1 2026 | 71 | 14M | 85.1% | 25 / 23 | 13 / 8 | 10M | 1M |
| Q4 2025 | 56 | 5M | 32.1% | 56 / 0 | 0 / 0 | 5M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of STRO | Value | % of fund | As of |
|---|---|---|---|---|---|
| Eventide Healthcare & Life Sciences Fund | 585,262 | 3.53% | $19.43M | 1.09% | Jun 30, 2026 |
| Vanguard Total Stock Market Index Fund | 501,524 | 3.02% | $16.65M | 0.00% | Jun 30, 2026 |
| iShares Russell 2000 ETF | 326,271 | 1.97% | $10.83M | 0.01% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 177,208 | 1.07% | $5.88M | 0.01% | Jun 30, 2026 |
| Fidelity Small Cap Index Fund | 173,722 | 1.05% | $4.20M | 0.01% | Jul 31, 2026 |
| Nuveen Quant Small Cap Equity Fund | 126,290 | 0.76% | $3.05M | 0.08% | Jul 31, 2026 |
| iShares Russell 2000 Value ETF | 98,529 | 0.59% | $3.27M | 0.02% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 78,053 | 0.47% | $2.28M | 0.01% | May 31, 2026 |
| Goldman Sachs Small Cap Equity Insights Fund | 77,195 | 0.47% | $1.87M | 0.18% | Jul 31, 2026 |
| Goldman Sachs Small Cap Value Insights Fund | 66,530 | 0.40% | $1.61M | 0.12% | Jul 31, 2026 |
| JPMorgan U.S. Small Company Fund | 60,304 | 0.36% | $2.00M | 0.18% | Jun 30, 2026 |
| iShares Micro-Cap ETF | 47,714 | 0.29% | $1.58M | 0.10% | Jun 30, 2026 |
| Schwab Small-Cap Index Fund | 38,737 | 0.23% | $936.27K | 0.01% | Jul 31, 2026 |
| Vanguard Explorer Fund | 28,467 | 0.17% | $688.05K | 0.00% | Jul 31, 2026 |
| Schwab Small-Cap Equity Fund | 28,234 | 0.17% | $682.42K | 0.10% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Jane Chung | Chief Executive Officer, Director | 21,567 | 0.13% | Mar 6, 2026 |
| William J. Newell | CEO, Director | 409,056 | 2.47% | Mar 7, 2025 |
| Hans-Peter Gerber | CHIEF SCIENTIFIC OFFICER | 12,367 | 0.07% | Sep 22, 2026 |
| Gregory K. Chow | CFO | 4,725 | 0.03% | Jun 2, 2026 |
| David Pauling | Chief Admin. Ofcr. & GC | 10,025 | 0.06% | Mar 6, 2026 |
| Barbara Leyman | Chief Business Officer | 16,056 | 0.10% | Aug 26, 2025 |
| Edward C. Albini | CFO AND SECRETARY | 176,800 | 1.07% | May 19, 2025 |
| Venkatesh Srinivasan | CHIEF TECH OP OFFICER | 53,686 | 0.32% | May 5, 2025 |
| Linda A. Fitzpatrick | CHIEF PEOPLE & COMM. OFFICER | 137,821 | 0.83% | May 5, 2025 |
| Anne Elizabeth Borgman | CHIEF MEDICAL OFFICER | 97,452 | 0.59% | May 5, 2025 |
| Sukhi Jagpal | Director | – | – | Jun 9, 2026 |
| Joseph M. Lobacki | Director | 0 | – | Jun 9, 2026 |
| Connie Matsui | Director | 50,000 | 0.30% | Jun 9, 2026 |
| Jon Marc Wigginton | Director | 0 | – | Jun 9, 2026 |
| Daniel H. Petree | Director | 22,457 | 0.14% | Jun 9, 2026 |
| Michael Dybbs | Director | 0 | – | Jun 9, 2026 |
| James P. Panek | Director | 0 | – | Jun 9, 2026 |
| Heidi Hunter | Director | 0 | – | Jun 9, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Sep 18, 2026 | Tax withholding | −1,345 | $15.34 | $20.63K | 12,367 |
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Sep 18, 2026 | Option exercise | +3,750 | – | – | 13,712 |
| Gregory K. Chow CFO | Jun 2, 2026 | Option exercise | +2,500 | – | – | 4,725 |
| Jane Chung Chief Executive Officer, Director | Mar 4, 2026 | Option exercise | +788 | – | – | 21,567 |
| Jane Chung Chief Executive Officer, Director | Mar 4, 2026 | Tax withholding | −282 | $21.31 | $6.01K | 21,285 |
| David Pauling Chief Admin. Ofcr. & GC | Mar 4, 2026 | Option exercise | +675 | – | – | 10,025 |
| David Pauling Chief Admin. Ofcr. & GC | Mar 4, 2026 | Tax withholding | −277 | $21.31 | $5.90K | 9,748 |
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Mar 2, 2026 | Tax withholding | −1,170 | $20.55 | $24.04K | 9,518 |
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Mar 2, 2026 | Option exercise | +2,843 | – | – | 10,688 |
| Jane Chung Chief Executive Officer, Director | Mar 2, 2026 | Option exercise | +7,750 | – | – | 23,558 |
| Jane Chung Chief Executive Officer, Director | Mar 2, 2026 | Tax withholding | −2,779 | $20.55 | $57.11K | 20,779 |
| David Pauling Chief Admin. Ofcr. & GC | Mar 2, 2026 | Option exercise | +2,356 | – | – | 10,320 |
| David Pauling Chief Admin. Ofcr. & GC | Mar 2, 2026 | Tax withholding | −970 | $20.55 | $19.93K | 9,350 |
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Mar 1, 2026 | Option exercise | +1,125 | – | – | 8,308 |
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Mar 1, 2026 | Tax withholding | −463 | $20.47 | $9.48K | 7,845 |
| Jane Chung Chief Executive Officer, Director | Mar 1, 2026 | Option exercise | +688 | – | – | 14,579 |
| Jane Chung Chief Executive Officer, Director | Mar 1, 2026 | Option exercise | +2,500 | – | – | 17,079 |
| Jane Chung Chief Executive Officer, Director | Mar 1, 2026 | Tax withholding | −1,271 | $20.47 | $26.02K | 15,808 |
| David Pauling Chief Admin. Ofcr. & GC | Mar 1, 2026 | Tax withholding | −551 | $20.47 | $11.28K | 7,964 |
| David Pauling Chief Admin. Ofcr. & GC | Mar 1, 2026 | Option exercise | +842 | – | – | 8,515 |
| David Pauling Chief Admin. Ofcr. & GC | Mar 1, 2026 | Option exercise | +500 | – | – | 7,673 |
| Jane Chung Chief Executive Officer, Director | Dec 12, 2025 | Option exercise | +2,500 | – | – | 14,785 |
| Jane Chung Chief Executive Officer, Director | Dec 12, 2025 | Tax withholding | −894 | $8.02 | $7.17K | 13,891 |
| Connie Matsui Director | Oct 15, 2025 | Buy | +50,000 | $0.80 | $40.00K | 50,000 |
| Gregory K. Chow CFO | Oct 15, 2025 | Buy | +19,750 | $0.81 | $16.00K | 19,750 |
| David Pauling Chief Admin. Ofcr. & GC | Oct 15, 2025 | Buy | +12,504 | $0.80 | $10.00K | 71,737 |
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Oct 15, 2025 | Buy | +17,000 | $0.80 | $13.60K | 71,832 |
| Jane Chung Chief Executive Officer, Director | Oct 15, 2025 | Buy | +12,500 | $0.80 | $10.00K | 122,850 |
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Sep 18, 2025 | Tax withholding | −13,417 | $0.90 | $12.08K | 54,832 |
| Hans-Peter Gerber CHIEF SCIENTIFIC OFFICER | Sep 18, 2025 | Option exercise | +37,500 | – | – | 68,249 |
| Jane Chung Chief Executive Officer, Director | Aug 9, 2025 | Tax withholding | −6,708 | $0.80 | $5.37K | 110,350 |
| Jane Chung Chief Executive Officer, Director | Aug 9, 2025 | Option exercise | +18,750 | – | – | 117,058 |
| Barbara Leyman Chief Business Officer | Jul 8, 2025 | Tax withholding | −8,944 | $0.78 | $6.98K | 16,056 |
| Barbara Leyman Chief Business Officer | Jul 8, 2025 | Option exercise | +25,000 | – | – | 25,000 |
| Edward C. Albini CFO AND SECRETARY | May 15, 2025 | Option exercise | +9,125 | – | – | 176,800 |
| Edward C. Albini CFO AND SECRETARY | May 15, 2025 | Option exercise | +11,156 | – | – | 167,675 |
| Edward C. Albini CFO AND SECRETARY | May 15, 2025 | Tax withholding | −15,995 | $0.88 | $14.08K | 160,805 |
| Edward C. Albini CFO AND SECRETARY | May 15, 2025 | Option exercise | +24,438 | – | – | 156,519 |
| Linda A. Fitzpatrick CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | Option exercise | +13,140 | – | – | 127,438 |
| Linda A. Fitzpatrick CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | Option exercise | +5,844 | – | – | 133,282 |
| Linda A. Fitzpatrick CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | Tax withholding | −13,538 | $1.07 | $14.49K | 119,744 |
| Linda A. Fitzpatrick CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | Option exercise | +9,740 | – | – | 114,298 |
| Linda A. Fitzpatrick CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | Option exercise | +9,125 | – | – | 104,558 |
| Venkatesh Srinivasan CHIEF TECH OP OFFICER | May 1, 2025 | Tax withholding | −894 | $1.07 | $957 | 53,686 |
| Venkatesh Srinivasan CHIEF TECH OP OFFICER | May 1, 2025 | Option exercise | +2,500 | – | – | 54,580 |
| Anne Elizabeth Borgman CHIEF MEDICAL OFFICER | May 1, 2025 | Tax withholding | −24,709 | $1.07 | $26.44K | 97,452 |
| Anne Elizabeth Borgman CHIEF MEDICAL OFFICER | May 1, 2025 | Option exercise | +53,125 | – | – | 106,223 |
| Anne Elizabeth Borgman CHIEF MEDICAL OFFICER | May 1, 2025 | Option exercise | +15,938 | – | – | 122,161 |
| Venkatesh Srinivasan CHIEF TECH OP OFFICER | Apr 11, 2025 | Tax withholding | −7,603 | $0.60 | $4.56K | 52,080 |
| Venkatesh Srinivasan CHIEF TECH OP OFFICER | Apr 11, 2025 | Option exercise | +21,250 | – | – | 59,683 |
| William J. Newell CEO, Director | Mar 5, 2025 | Tax withholding | −6,708 | $1.36 | $9.12K | 292,531 |
| William J. Newell CEO, Director | Mar 5, 2025 | Option exercise | +18,750 | – | – | 299,239 |
| Linda A. Fitzpatrick CHIEF PEOPLE & COMM. OFFICER | Mar 5, 2025 | Option exercise | +8,750 | – | – | 99,027 |
| Linda A. Fitzpatrick CHIEF PEOPLE & COMM. OFFICER | Mar 5, 2025 | Tax withholding | −3,594 | $1.36 | $4.89K | 95,433 |
| Edward C. Albini CFO AND SECRETARY | Mar 5, 2025 | Tax withholding | −3,594 | $1.36 | $4.89K | 132,081 |
| Edward C. Albini CFO AND SECRETARY | Mar 5, 2025 | Option exercise | +8,750 | – | – | 135,675 |
| Edward C. Albini CFO AND SECRETARY | Mar 4, 2025 | Option exercise | +9,125 | – | – | 130,673 |
| Edward C. Albini CFO AND SECRETARY | Mar 4, 2025 | Tax withholding | −3,748 | $1.42 | $5.32K | 126,925 |
| Jane Chung PRESIDENT AND COO | Mar 4, 2025 | Tax withholding | −2,334 | $1.42 | $3.31K | 98,308 |
| Jane Chung PRESIDENT AND COO | Mar 4, 2025 | Option exercise | +7,875 | – | – | 100,642 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Leyman Barbara Former Officer | Jan 20, 2026 | 8,929 | $130.96K | Jan 20, 2026 | Stock Option Exercise |
| J. Vasquez Nicki Officer | Jan 29, 2024 | 12,185 | $60.93K | Jan 29, 2024 | Restricted Stock |
| Brunilda Shtylla Officer | Aug 25, 2023 | 27,041 | $156.33K | Aug 25, 2023 | RETAIL PURCHASE |