Sutro Biopharma, Inc.
STROHealthcare|Biotechnology|US
$9.62
+0.42 (+4.57%)
Cash / Share
$9.92
Ownership Breakdown
64.9%
Float
16.6M
Shares Outstanding
10.8M
Float Shares
Major Holders (35)
Combined: 152.1%
Holders of 5%+ from their latest Schedule 13D/13G filing in the last two years. Percentages are as of each filing date.
| Holder | Type | % of Class | Shares | Filed | Filing |
|---|---|---|---|---|---|
| Joseph Edelman | Individual | 7.90% | 1,304,846 | Aug 14, 2026 | 13D/G |
| Perceptive Life Sciences Master Fund, Ltd. | Corporation | 7.90% | 1,304,846 | Aug 14, 2026 | 13D/G |
| Perceptive Advisors LLC | Investment adviser | 7.90% | 1,304,846 | Aug 14, 2026 | 13D/G |
| Affinity Healthcare Fund, LP | Partnership | 7.77% | 6,583,772 | Oct 23, 2025 | 13D/G |
| Lampert Mark N | Individual | 7.60% | 1,251,788 | Feb 18, 2026 | 13D/G |
| BVF Partners L P/Il | IA, PN | 7.60% | 1,251,788 | Feb 18, 2026 | 13D/G |
| BVF Inc/Il | Corporation | 7.60% | 1,251,788 | Feb 18, 2026 | 13D/G |
| BVF GP Holdings LLC | Other | 7.00% | 1,157,609 | Feb 18, 2026 | 13D/G |
| Michael Cho | HC, IN | 6.50% | 1,069,519 | May 14, 2026 | 13D/G |
| Affinity Asset Advisors, LLC | IA, OO | 6.50% | 1,069,519 | May 14, 2026 | 13D/G |
| BlackRock, Inc. | Holding company | 6.40% | 1,065,366 | Jul 30, 2026 | 13D/G |
| Srinivas Akkaraju | Individual | 6.40% | 1,062,872 | May 15, 2026 | 13D/G |
| Yue Tang | Individual | 5.27% | 0 | May 15, 2026 | 13D/G |
| Kynam Capital Management, LP | Investment adviser | 5.27% | 0 | May 15, 2026 | 13D/G |
| Kynam Capital Management GP, LLC | Other | 5.27% | 0 | May 15, 2026 | 13D/G |
| The Vanguard Group | Investment adviser | 4.87% | 4,115,250 | Jul 29, 2025 | 13D/G |
| BVF I GP LLC | Other | 4.10% | 668,693 | Feb 18, 2026 | 13D/G |
| Biotechnology Value Fund L P | Partnership | 4.10% | 668,693 | Feb 18, 2026 | 13D/G |
| Samsara Opportunity Fund, L.P. | Partnership | 3.90% | 643,777 | May 15, 2026 | 13D/G |
| Samsara Opportunity Fund GP, LLC | Other | 3.90% | 643,777 | May 15, 2026 | 13D/G |
| BVF II GP LLC | Other | 3.00% | 488,916 | Feb 18, 2026 | 13D/G |
| Biotechnology Value Fund II LP | Partnership | 3.00% | 488,916 | Feb 18, 2026 | 13D/G |
| Robert Atchinson | HC, IN | 2.75% | 2,250,132 | Nov 12, 2024 | 13D/G |
| Phillip Gross | HC, IN | 2.75% | 2,250,132 | Nov 12, 2024 | 13D/G |
| Adage Capital Management, L.P. | IA, PN | 2.75% | 2,250,132 | Nov 12, 2024 | 13D/G |
| Samsara BioCapital, L.P. | Partnership | 2.50% | 419,095 | May 15, 2026 | 13D/G |
| Samsara BioCapital GP, LLC | Other | 2.50% | 419,095 | May 15, 2026 | 13D/G |
| Point72 Asset Management, L.P. | Partnership | 1.40% | 237,827 | Aug 14, 2026 | 13D/G |
| Point72 Capital Advisors, Inc. | Corporation | 1.40% | 237,827 | Aug 14, 2026 | 13D/G |
| Steven A. Cohen | Individual | 1.40% | 237,827 | Aug 14, 2026 | 13D/G |
| Israel A. Englander | Individual | 1.30% | 210,378 | Apr 21, 2026 | 13D/G |
| Millennium Group Management LLC | Other | 1.30% | 210,378 | Apr 21, 2026 | 13D/G |
| Millennium Management LLC | Other | 1.30% | 210,378 | Apr 21, 2026 | 13D/G |
| Biotechnology Value Trading Fund OS LP | Partnership | 0.50% | 75,359 | Feb 18, 2026 | 13D/G |
| BVF Partners OS Ltd. | Corporation | 0.50% | 75,359 | Feb 18, 2026 | 13D/G |
Insider Trades (100)
Last 4 quarters: 596,196 acquired · 144,043 disposed
| Insider | Position | Date | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sep 18, 2026 | OPTION EX. | 3,750 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sep 18, 2026 | TAX W/H | 1,345 | $15.34 | $20.6K | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sep 18, 2026 | OPTION EX. | 3,750 | — | — | Form 4 |
| Wigginton Jon Marc | director | Jun 5, 2026 | AWARD | 10,000 | $26.09 | $260.9K | Form 4 |
| Petree Daniel H | director | Jun 5, 2026 | AWARD | 10,000 | $26.09 | $260.9K | Form 4 |
| PANEK JAMES P | director | Jun 5, 2026 | AWARD | 10,000 | $26.09 | $260.9K | Form 4 |
| Lobacki Joseph M | director | Jun 5, 2026 | AWARD | 10,000 | $26.09 | $260.9K | Form 4 |
| Jagpal Sukhi | director | Jun 5, 2026 | AWARD | 10,000 | $26.09 | $260.9K | Form 4 |
| Hunter Heidi | director | Jun 5, 2026 | AWARD | 10,000 | $26.09 | $260.9K | Form 4 |
| Dybbs Michael | director | Jun 5, 2026 | AWARD | 10,000 | $26.09 | $260.9K | Form 4 |
| MATSUI CONNIE | director | Jun 5, 2026 | AWARD | 10,000 | $26.09 | $260.9K | Form 4 |
| Chow Gregory K. | CFO | Jun 2, 2026 | OPTION EX. | 2,500 | — | — | Form 4 |
| Chow Gregory K. | CFO | Jun 2, 2026 | OPTION EX. | 2,500 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 4, 2026 | OPTION EX. | 675 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 4, 2026 | TAX W/H | 277 | $21.31 | $5.9K | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 4, 2026 | OPTION EX. | 675 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 4, 2026 | OPTION EX. | 788 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 4, 2026 | TAX W/H | 282 | $21.31 | $6.0K | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 4, 2026 | OPTION EX. | 788 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 2, 2026 | AWARD | 33,600 | $20.55 | $690.5K | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 2, 2026 | OPTION EX. | 2,356 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 2, 2026 | TAX W/H | 970 | $20.55 | $19.9K | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 1, 2026 | OPTION EX. | 842 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 1, 2026 | TAX W/H | 551 | $20.47 | $11.3K | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 1, 2026 | OPTION EX. | 500 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 2, 2026 | OPTION EX. | 2,356 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 2, 2026 | AWARD | 4,200 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 1, 2026 | OPTION EX. | 842 | — | — | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Mar 1, 2026 | OPTION EX. | 500 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Mar 2, 2026 | AWARD | 40,000 | $20.55 | $822.0K | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Mar 2, 2026 | OPTION EX. | 2,843 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Mar 2, 2026 | TAX W/H | 1,170 | $20.55 | $24.0K | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Mar 2, 2026 | OPTION EX. | 2,843 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Mar 1, 2026 | OPTION EX. | 1,125 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Mar 1, 2026 | TAX W/H | 463 | $20.47 | $9.5K | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Mar 2, 2026 | AWARD | 5,000 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Mar 1, 2026 | OPTION EX. | 1,125 | — | — | Form 4 |
| Chow Gregory K. | CFO | Mar 2, 2026 | AWARD | 40,000 | $20.55 | $822.0K | Form 4 |
| Chow Gregory K. | CFO | Mar 2, 2026 | AWARD | 5,000 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 2, 2026 | AWARD | 175,000 | $20.55 | $3.6M | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 2, 2026 | AWARD | 40,000 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 2, 2026 | OPTION EX. | 7,750 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 2, 2026 | OPTION EX. | 7,750 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 2, 2026 | TAX W/H | 2,779 | $20.55 | $57.1K | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 1, 2026 | OPTION EX. | 2,500 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 1, 2026 | TAX W/H | 1,271 | $20.47 | $26.0K | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 1, 2026 | OPTION EX. | 688 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 1, 2026 | OPTION EX. | 2,500 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Mar 1, 2026 | OPTION EX. | 688 | — | — | Form 4 |
| Wigginton Jon Marc | director | Dec 23, 2025 | AWARD | 1,500 | $10.38 | $15.6K | Form 4 |
| Petree Daniel H | director | Dec 23, 2025 | AWARD | 1,500 | $10.38 | $15.6K | Form 4 |
| PANEK JAMES P | director | Dec 23, 2025 | AWARD | 1,500 | $10.38 | $15.6K | Form 4 |
| MATSUI CONNIE | director | Dec 23, 2025 | AWARD | 1,500 | $10.38 | $15.6K | Form 4 |
| Lobacki Joseph M | director | Dec 23, 2025 | AWARD | 1,500 | $10.38 | $15.6K | Form 4 |
| Jagpal Sukhi | director | Dec 23, 2025 | AWARD | 1,500 | $10.38 | $15.6K | Form 4 |
| Hunter Heidi | director | Dec 23, 2025 | AWARD | 1,500 | $10.38 | $15.6K | Form 4 |
| Dybbs Michael | director | Dec 23, 2025 | AWARD | 1,500 | $10.38 | $15.6K | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Dec 23, 2025 | AWARD | 7,200 | $10.38 | $74.7K | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Dec 23, 2025 | AWARD | 7,925 | $10.38 | $82.3K | Form 4 |
| Chow Gregory K. | CFO | Dec 23, 2025 | AWARD | 8,200 | $10.38 | $85.1K | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Dec 12, 2025 | OPTION EX. | 2,500 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Dec 12, 2025 | TAX W/H | 894 | $8.02 | $7.2K | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Dec 12, 2025 | OPTION EX. | 2,500 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Oct 15, 2025 | BUY | 17,000 | $0.80 | $13.6K | Form 4 |
| Chow Gregory K. | CFO | Oct 15, 2025 | BUY | 19,750 | $0.81 | $16.0K | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Oct 15, 2025 | BUY | 12,500 | $0.80 | $10.0K | Form 4 |
| MATSUI CONNIE | director | Oct 15, 2025 | BUY | 50,000 | $0.80 | $40.0K | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Oct 15, 2025 | BUY | 12,504 | $0.80 | $10.0K | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sep 18, 2025 | OPTION EX. | 37,500 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sep 18, 2025 | OPTION EX. | 37,500 | — | — | Form 4 |
| Gerber Hans-Peter | CHIEF SCIENTIFIC OFFICER | Sep 18, 2025 | TAX W/H | 13,417 | $0.90 | $12.1K | Form 4 |
| Pauling David | Chief Admin. Ofcr. & GC | Apr 4, 2025 | OTHER | 0 | — | — | Form 4 |
| Leyman Barbara | Chief Business Officer | Jul 8, 2025 | OPTION EX. | 25,000 | — | — | Form 4 |
| Leyman Barbara | Chief Business Officer | Jul 8, 2025 | OPTION EX. | 25,000 | — | — | Form 4 |
| Leyman Barbara | Chief Business Officer | Jul 8, 2025 | TAX W/H | 8,944 | $0.78 | $7.0K | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Aug 9, 2025 | OPTION EX. | 18,750 | — | — | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Aug 9, 2025 | TAX W/H | 6,708 | $0.80 | $5.4K | Form 4 |
| Chung Jane | director, officer: Chief Executive Officer | Aug 9, 2025 | OPTION EX. | 18,750 | — | — | Form 4 |
| Wigginton Jon Marc | director | Jun 6, 2025 | AWARD | 50,000 | $0.85 | $42.5K | Form 4 |
| Petree Daniel H | director | Jun 6, 2025 | AWARD | 50,000 | $0.85 | $42.5K | Form 4 |
| PANEK JAMES P | director | Jun 6, 2025 | AWARD | 50,000 | $0.85 | $42.5K | Form 4 |
| MATSUI CONNIE | director | Jun 6, 2025 | AWARD | 50,000 | $0.85 | $42.5K | Form 4 |
| Lobacki Joseph M | director | Jun 6, 2025 | AWARD | 50,000 | $0.85 | $42.5K | Form 4 |
| Jagpal Sukhi | director | Jun 6, 2025 | AWARD | 50,000 | $0.85 | $42.5K | Form 4 |
| Hunter Heidi | director | Jun 6, 2025 | AWARD | 50,000 | $0.85 | $42.5K | Form 4 |
| Dybbs Michael | director | Jun 6, 2025 | AWARD | 50,000 | $0.85 | $42.5K | Form 4 |
| Chow Gregory K. | CFO | Jun 2, 2025 | AWARD | 275,000 | $0.90 | $247.5K | Form 4 |
| Chow Gregory K. | CFO | Jun 2, 2025 | AWARD | 100,000 | — | — | Form 4 |
| Chow Gregory K. | Jun 2, 2025 | OTHER | 0 | — | — | Form 4 | |
| ALBINI EDWARD C | CFO AND SECRETARY | May 15, 2025 | OPTION EX. | 9,125 | — | — | Form 4 |
| ALBINI EDWARD C | CFO AND SECRETARY | May 15, 2025 | OPTION EX. | 11,156 | — | — | Form 4 |
| ALBINI EDWARD C | CFO AND SECRETARY | May 15, 2025 | TAX W/H | 15,995 | $0.88 | $14.1K | Form 4 |
| ALBINI EDWARD C | CFO AND SECRETARY | May 15, 2025 | OPTION EX. | 24,438 | — | — | Form 4 |
| ALBINI EDWARD C | CFO AND SECRETARY | May 15, 2025 | OPTION EX. | 24,438 | — | — | Form 4 |
| ALBINI EDWARD C | CFO AND SECRETARY | May 15, 2025 | OPTION EX. | 11,156 | — | — | Form 4 |
| ALBINI EDWARD C | CFO AND SECRETARY | May 15, 2025 | OPTION EX. | 9,125 | — | — | Form 4 |
| FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | OPTION EX. | 5,844 | — | — | Form 4 |
| FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | OPTION EX. | 13,140 | — | — | Form 4 |
| FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | TAX W/H | 13,538 | $1.07 | $14.5K | Form 4 |
| FITZPATRICK LINDA A | CHIEF PEOPLE & COMM. OFFICER | May 1, 2025 | OPTION EX. | 9,740 | — | — | Form 4 |