Jane Chung, CEO of Sutro Biopharma Inc. ($STRO), made one open market purchase of company shares in the past year, totaling just over $10,000. Her most recent buy occurred on October 15, 2025. Among nearly 5,000 insiders tracking open market buys, her activity ranks 4,280th by amount, well below the average of $1.46 million across about 3.3 transactions. She reported no open market sales.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 4, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Restricted Stock Units (RSUs) | 788 | $0.00 | 0.0000 | 85,135,290 | 100.00% | 0.00% |
| March 4, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | F | Common Stock | 282 | $21.31 | 21,285.0000 | 85,135,290 | 1.31% | 0.00% |
| March 4, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Common Stock | 788 | $0.00 | 21,567.0000 | 85,135,290 | 3.79% | 0.00% |
| March 1, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | F | Common Stock | 1271 | $20.47 | 15,808.0000 | 85,135,290 | 7.44% | 0.00% |
| March 1, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Common Stock | 688 | $0.00 | 14,579.0000 | 85,135,290 | 4.95% | 0.00% |
| March 2, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Common Stock | 7750 | $0.00 | 23,558.0000 | 85,135,290 | 49.03% | 0.01% |
| March 2, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | A | Stock Option (right to buy) | 175000 | $0.00 | 175,000.0000 | 85,135,290 | 9999.99% | 0.21% |
| March 1, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Restricted Stock Units (RSUs) | 688 | $0.00 | 688.0000 | 85,135,290 | 50.00% | 0.00% |
| March 1, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Restricted Stock Units (RSUs) | 2500 | $0.00 | 5,000.0000 | 85,135,290 | 33.33% | 0.00% |
| March 2, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Restricted Stock Units (RSUs) | 7750 | $0.00 | 23,250.0000 | 85,135,290 | 25.00% | 0.01% |
| March 2, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | F | Common Stock | 2779 | $20.55 | 20,779.0000 | 85,135,290 | 11.80% | 0.00% |
| March 2, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | A | Restricted Stock Units (RSUs) | 40000 | $0.00 | 40,000.0000 | 85,135,290 | 9999.99% | 0.05% |
| March 1, 2026 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Common Stock | 2500 | $0.00 | 17,079.0000 | 85,135,290 | 17.15% | 0.00% |
| Dec. 12, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | F | Common Stock | 894 | $8.02 | 13,891.0000 | 85,135,290 | 6.05% | 0.00% |
| Dec. 12, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Common Stock | 2500 | $0.00 | 14,785.0000 | 85,135,290 | 20.35% | 0.00% |
| Dec. 12, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Restricted Stock Unit (RSU) | 2500 | $0.00 | 5,000.0000 | 85,135,290 | 33.33% | 0.00% |
| Oct. 15, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | P | Common Stock | 12500 | $0.80 | 122,850.0000 | 83,775,336 | 11.33% | 0.01% |
| Aug. 9, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | F | Common Stock | 6708 | $0.80 | 110,350.0000 | 83,775,336 | 5.73% | 0.01% |
| Aug. 9, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Common Stock | 18750 | $0.00 | 117,058.0000 | 83,775,336 | 19.07% | 0.02% |
| Aug. 9, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | M | Restricted Stock Unit (RSU) | 18750 | $0.00 | 0.0000 | 83,775,336 | 100.00% | 0.02% |
| April 4, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | A | Stock Option (Right to Buy) | 620000 | $0.00 | 620,000.0000 | 83,775,336 | 9999.99% | 0.74% |
| April 4, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | Chief Executive Officer | A | Restricted Stock Units (RSUs) | 310000 | $0.00 | 310,000.0000 | 83,775,336 | 9999.99% | 0.37% |
| March 4, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | F | Common Stock | 2334 | $1.42 | 98,308.0000 | 0 | 2.32% | 0.00% |
| March 4, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Restricted Stock Unit (RSU) | 7875 | $0.00 | 7,875.0000 | 0 | 50.00% | 0.00% |
| March 4, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Common Stock | 7875 | $0.00 | 100,642.0000 | 0 | 8.49% | 0.00% |
| March 1, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Restricted Stock Unit (RSU) | 25000 | $0.00 | 75,000.0000 | 0 | 25.00% | 0.00% |
| March 1, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Common Stock | 6875 | $0.00 | 77,217.0000 | 0 | 9.77% | 0.00% |
| March 1, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Common Stock | 25000 | $0.00 | 102,217.0000 | 0 | 32.38% | 0.00% |
| March 1, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | F | Common Stock | 9450 | $1.59 | 92,767.0000 | 0 | 9.25% | 0.00% |
| March 1, 2025 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Restricted Stock Unit (RSU) | 6875 | $0.00 | 13,750.0000 | 0 | 33.33% | 0.00% |
| Dec. 1, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | F | Common Stock | 8920 | $2.69 | 70,342.0000 | 0 | 11.25% | 0.00% |
| Dec. 1, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Common Stock | 25000 | $0.00 | 79,262.0000 | 0 | 46.07% | 0.00% |
| Dec. 1, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Restricted Stock Unit (RSU) | 25000 | $0.00 | 75,000.0000 | 0 | 25.00% | 0.00% |
| Aug. 9, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | F | Common Stock | 6689 | $3.12 | 54,262.0000 | 0 | 10.97% | 0.00% |
| Aug. 9, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Restricted Stock Unit (RSU) | 18750 | $0.00 | 18,750.0000 | 0 | 50.00% | 0.00% |
| Aug. 9, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Common Stock | 18750 | $0.00 | 60,951.0000 | 0 | 44.43% | 0.00% |
| June 20, 2024 | Viracta Therapeutics, Inc. | $VIRX | Chung Jane | Not found | A | Stock Option (Right to Buy) | 50000 | $0.00 | 50,000.0000 | 39,272,434 | 9999.99% | 0.13% |
| March 5, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | A | Stock Option (Right to Buy Common Stock) | 50000 | $0.00 | 50,000.0000 | 0 | 9999.99% | 0.00% |
| March 5, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | A | Restricted Stock Units (RSUs) | 100000 | $0.00 | 100,000.0000 | 0 | 9999.99% | 0.00% |
| March 4, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Common Stock | 7875 | $0.00 | 44,410.0000 | 0 | 21.55% | 0.00% |
| March 4, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | F | Common Stock | 2209 | $4.79 | 42,201.0000 | 0 | 4.97% | 0.00% |
| March 4, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Restricted Stock Unit (RSU) | 7875 | $0.00 | 15,750.0000 | 0 | 33.33% | 0.00% |
| March 1, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Restricted Stock Unit (RSU) | 6875 | $0.00 | 20,625.0000 | 0 | 25.00% | 0.00% |
| March 1, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | M | Common Stock | 6875 | $0.00 | 38,573.0000 | 0 | 21.69% | 0.00% |
| March 1, 2024 | SUTRO BIOPHARMA, INC. | $STRO | Chung Jane | PRESIDENT AND COO | F | Common Stock | 2038 | $4.95 | 36,535.0000 | 0 | 5.28% | 0.00% |