XOMA's three largest insider shareholders as of July 24, 2026 are Partners L P/Il Bvf (TenPercentOwner, 1.27Mn shares), Owen Hughes (Chief Executive Officer, 191.26K shares), Jeffrey Trigilio (Chief Financial Officer, 103.91K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Jack L Wyszomierski | - | 21,530 | 0 | 26 Mar, 2026 |
| Partners L P/Il Bvf | - | 1,267,545 | 0 | 20 May, 2025 |
| Joseph M Limber | - | 20,000 | 0 | 07 Apr, 2025 |
| Heather L Franklin | - | 5,971 | 0 | 23 May, 2025 |
| Matthew D Perry | - | 23,840 | 0 | 23 May, 2025 |
| Owen Hughes | Chief Executive Officer | 191,264 | 0 | 22 Apr, 2026 |
| James R Neal | Ceo | 11,822 | 0 | 18 Jul, 2022 |
| Thomas M. Burns | Svp, Finance Cfo | 30,079 | 0 | 23 Sep, 2025 |
| Barbara Kosacz | - | 5,971 | 0 | 23 May, 2025 |
| Natasha Hernday | - | 9,006 | 0 | 23 May, 2025 |
| Jeffrey Trigilio | Chief Financial Officer | 103,906 | 0 | 22 Apr, 2026 |
| Bradley Sitko | Chief Investment Officer | 82,961 | 0 | 22 Apr, 2026 |
| Maricel Perea Montano | Chief Legal Officer | 41,793 | 0 | 22 Apr, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 20 Apr, 2026 | Maricel Perea Montano | Common Stock | A | 3,370 | $0.00 | 41,793 | D | M |
| 20 Apr, 2026 | Bradley Sitko | Common Stock | A | 3,737 | $0.00 | 82,961 | D | M |
| 20 Apr, 2026 | Owen Hughes | Common Stock | A | 10,568 | $0.00 | 191,264 | D | M |
| 20 Apr, 2026 | Jeffrey Trigilio | Common Stock | A | 11,538 | $0.00 | 103,906 | D | M |
| 20 Apr, 2026 | Jeffrey Trigilio | Performance Stock Units | D | 11,538 | $0.00 | 126,924 | D | M |
| 20 Apr, 2026 | Maricel Perea Montano | Performance Stock Units | D | 3,370 | $0.00 | 37,074 | D | M |
| 20 Apr, 2026 | Owen Hughes | Performance Stock Units | D | 10,568 | $0.00 | 116,245 | D | M |
| 20 Apr, 2026 | Bradley Sitko | Performance Stock Units | D | 3,737 | $0.00 | 41,112 | D | M |
| 13 Apr, 2026 | Jeffrey Trigilio | Common Stock | A | 4,000 | $0.00 | 94,000 | D | M |
| 13 Apr, 2026 | Jeffrey Trigilio | Common Stock | D | 1,632 | $36.76 | 92,368 | D | F |
| 13 Apr, 2026 | Jeffrey Trigilio | Performance Stock Units | D | 4,000 | $0.00 | 26,000 | D | M |
| 27 Mar, 2026 | Joseph M Limber | Common Stock | A | 3,026 | $11.20 | 9,234 | D | M |
| 27 Mar, 2026 | Joseph M Limber | Stock Option (Right to Buy) | D | 3,026 | $0.00 | 0 | D | M |
| 24 Mar, 2026 | Jack L Wyszomierski | Common Stock | A | 3,026 | $11.20 | 21,530 | D | M |
| 24 Mar, 2026 | Jack L Wyszomierski | Stock Option (Right to Buy) | D | 3,026 | $0.00 | 0 | D | M |
| 16 Mar, 2026 | Owen Hughes | Common Stock | A | 82,428 | $0.00 | 180,696 | D | A |
| 16 Mar, 2026 | Owen Hughes | Performance Stock Units | A | 126,813 | $0.00 | 126,813 | D | A |
| 11 Mar, 2026 | Jeffrey Trigilio | Common Stock | A | 90,000 | $0.00 | 90,000 | D | A |
| 11 Mar, 2026 | Bradley Sitko | Common Stock | A | 30,000 | $0.00 | 49,822 | D | A |
| 11 Mar, 2026 | Maricel Perea Montano | Common Stock | A | 26,289 | $0.00 | 38,423 | D | A |