BioAtla, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| WALDRON RICHARD A | Chief Financial Officer | Tax Withholding | 2,371 | $0.90 | $2,134 | 346,150 | Nov 30, 2025 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 2,729 | $0.90 | $2,456 | 361,845 | Nov 30, 2025 |
| SHORT JAY M PHD | Chief Executive Officer | Tax Withholding | 6,347 | $0.90 | $5,712 | 2,237,331 | Nov 30, 2025 |
| Vasquez Christian | See Remarks | Tax Withholding | 1,566 | $0.90 | $1,409 | 291,998 | Nov 30, 2025 |
| SHORT JAY M PHD | Chief Executive Officer | Tax Withholding | 6,347 | $0.46 | $2,920 | 2,243,678 | Aug 31, 2025 |
| Vasquez Christian | See Remarks | Tax Withholding | 1,566 | $0.46 | $720 | 283,564 | Aug 31, 2025 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 2,729 | $0.46 | $1,255 | 364,574 | Aug 31, 2025 |
| WALDRON RICHARD A | Chief Financial Officer | Tax Withholding | 2,371 | $0.46 | $1,091 | 338,521 | Aug 31, 2025 |
| Moran Susan | — | Award / Grant | 23,500 | — | — | 52,307 | Jun 18, 2025 |
| Williams Eddie | — | Award / Grant | 23,500 | — | — | 60,200 | Jun 18, 2025 |
| STEINMAN LAWRENCE | — | Award / Grant | 23,500 | — | — | 78,459 | Jun 18, 2025 |
| GRAY MARY ANN | — | Award / Grant | 23,500 | — | — | 77,397 | Jun 18, 2025 |
| MCBRINN SYLVIA | — | Award / Grant | 23,500 | — | — | 59,125 | Jun 18, 2025 |
| Smith Scott Andrew | — | Award / Grant | 23,500 | — | — | 321,550 | Jun 18, 2025 |
| SHORT JAY M PHD | Chief Executive Officer | Tax Withholding | 6,347 | $0.41 | $2,602 | 2,250,025 | May 31, 2025 |
| WALDRON RICHARD A | Chief Financial Officer | Tax Withholding | 2,371 | $0.41 | $972 | 340,892 | May 31, 2025 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 2,729 | $0.41 | $1,119 | 367,303 | May 31, 2025 |
| Vasquez Christian | See Remarks | Tax Withholding | 1,566 | $0.41 | $642 | 285,130 | May 31, 2025 |
| SHORT JAY M PHD | Chief Executive Officer | Award / Grant | 431,000 | — | — | 2,256,372 | Mar 12, 2025 |
| Vasquez Christian | See Remarks | Award / Grant | 85,000 | — | — | 276,696 | Mar 11, 2025 |
| WALDRON RICHARD A | Chief Financial Officer | Award / Grant | 100,000 | — | — | 333,263 | Mar 11, 2025 |
| Sievers Eric | Chief Medical Officer | Award / Grant | 175,000 | — | — | 370,032 | Mar 11, 2025 |
| SHORT JAY M PHD | Chief Executive Officer | Tax Withholding | 30,911 | $0.46 | $14,219 | 1,825,372 | Feb 16, 2025 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 12,530 | $0.46 | $5,764 | 195,032 | Feb 15, 2025 |
| WALDRON RICHARD A | Chief Financial Officer | Tax Withholding | 10,887 | $0.46 | $5,008 | 233,263 | Feb 15, 2025 |
| Vasquez Christian | See Remarks | Tax Withholding | 7,189 | $0.46 | $3,307 | 191,696 | Feb 15, 2025 |
| Smith Scott Andrew | — | Tax Withholding | 2,181 | $1.77 | $3,860 | 298,050 | Aug 31, 2024 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 572 | $1.77 | $1,012 | 207,562 | Aug 31, 2024 |
| Smith Scott Andrew | — | Tax Withholding | 2,181 | $1.81 | $3,948 | 300,231 | Jul 31, 2024 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 572 | $1.81 | $1,035 | 208,134 | Jul 31, 2024 |
| Smith Scott Andrew | — | Tax Withholding | 2,181 | $1.37 | $2,988 | 302,412 | Jun 30, 2024 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 572 | $1.37 | $784 | 208,706 | Jun 30, 2024 |
| GRAY MARY ANN | — | Award / Grant | 16,500 | — | — | 53,897 | Jun 13, 2024 |
| MCBRINN SYLVIA | — | Award / Grant | 16,500 | — | — | 35,625 | Jun 13, 2024 |
| Smith Scott Andrew | — | Award / Grant | 16,500 | — | — | 304,593 | Jun 13, 2024 |
| STEINMAN LAWRENCE | — | Award / Grant | 16,500 | — | — | 54,959 | Jun 13, 2024 |
| Williams Eddie | — | Award / Grant | 16,500 | — | — | 36,700 | Jun 13, 2024 |
| Moran Susan | — | Award / Grant | 16,500 | — | — | 28,807 | Jun 13, 2024 |
| Smith Scott Andrew | — | Tax Withholding | 2,181 | $1.51 | $3,293 | 288,093 | May 31, 2024 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 572 | $1.51 | $864 | 209,278 | May 31, 2024 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 572 | $2.26 | $1,293 | 209,850 | Apr 30, 2024 |
| Smith Scott Andrew | — | Tax Withholding | 2,181 | $2.26 | $4,929 | 290,274 | Apr 30, 2024 |
| Smith Scott Andrew | — | Tax Withholding | 2,181 | $3.44 | $7,503 | 292,455 | Mar 31, 2024 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 572 | $3.44 | $1,968 | 210,422 | Mar 31, 2024 |
| Smith Scott Andrew | — | Tax Withholding | 2,181 | $2.70 | $5,889 | 294,636 | Feb 29, 2024 |
| Sievers Eric | Chief Medical Officer | Tax Withholding | 572 | $2.70 | $1,544 | 210,994 | Feb 29, 2024 |
| SHORT JAY M PHD | Chief Executive Officer | Award / Grant | 417,000 | — | — | 1,856,283 | Feb 16, 2024 |
| WALDRON RICHARD A | Chief Financial Officer | Award / Grant | 106,000 | — | — | 230,923 | Feb 15, 2024 |
| Vasquez Christian | See Remarks | Award / Grant | 70,000 | — | — | 185,659 | Feb 15, 2024 |
| Sievers Eric | Chief Medical Officer | Award / Grant | 122,000 | — | — | 211,566 | Feb 15, 2024 |