| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Whitefort Capital Management, LP | 9.9% | +19% | $22,757,853 | +$6,373,619 | 14,223,658 | +39% | Whitefort Capital Management, LP | 30 Sep 2025 |
| Ash X LP | 8.5% | +21% | $22,740,148 | +$4,107,701 | 12,291,972 | +22% | Robert Goldstein | 31 Dec 2025 |
| JANUS HENDERSON GROUP PLC | 0.8% | -83% | $2,086,555 | -$15,655,944 | 948,434 | -88% | JANUS HENDERSON GROUP PLC | 30 Jun 2025 |
As of 31 Dec 2025, 127 institutional investors reported holding 57,293,181 shares of OmniAb, Inc. - Common Stock, par value $0.0001 per share (OABI). This represents 40% of the company’s total 144,611,435 outstanding shares.
The largest institutional shareholders of OmniAb, Inc. - Common Stock, par value $0.0001 per share (OABI) together control 37% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Whitefort Capital Management, LP | 9.8% | 14,223,658 | 0% | 8% | $26,313,767 |
| BlackRock, Inc. | 5.6% | 8,064,981 | +16% | 0% | $14,920,215 |
| VANGUARD GROUP INC | 3.9% | 5,625,197 | +9.3% | 0% | $10,406,615 |
| CADIAN CAPITAL MANAGEMENT, LP | 3.1% | 4,434,954 | +21% | 0.59% | $8,204,665 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.9% | 2,722,692 | +17% | 0% | $5,037,854 |
| PRIVATE MANAGEMENT GROUP INC | 1.7% | 2,420,478 | -3.9% | 0.13% | $4,477,884 |
| RICE HALL JAMES & ASSOCIATES, LLC | 1.7% | 2,401,088 | -0.45% | 0.24% | $4,442,013 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 2,152,593 | -16% | 0% | $3,982,373 |
| STATE STREET CORP | 1.4% | 2,048,996 | -2.2% | 0% | $3,790,643 |
| TOWERVIEW LLC | 0.69% | 1,000,000 | +20% | 1.3% | $1,850,000 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.67% | 966,026 | +23% | 0% | $1,787,148 |
| Nuveen, LLC | 0.6% | 874,512 | +0% | 0% | $1,617,847 |
| NORTHERN TRUST CORP | 0.57% | 829,021 | +1.3% | 0% | $1,533,688 |
| ISTHMUS PARTNERS, LLC | 0.5% | 721,309 | +7.8% | 0.15% | $1,334,422 |
| ADAR1 Capital Management, LLC | 0.49% | 702,190 | -36% | 0.1% | $1,299,052 |
| Stonepine Capital Management, LLC | 0.48% | 701,000 | -67% | 1% | $1,296,850 |
| MILLENNIUM MANAGEMENT LLC | 0.47% | 673,395 | +136% | 0% | $1,020,909 |
| GOLDMAN SACHS GROUP INC | 0.37% | 540,277 | -8.1% | 0% | $999,513 |
| TWO SIGMA INVESTMENTS, LP | 0.29% | 423,104 | +45% | 0% | $782,742 |
| MORGAN STANLEY | 0.27% | 389,687 | -52% | 0% | $720,922 |
| D. E. Shaw & Co., Inc. | 0.26% | 383,152 | +106% | 0% | $708,832 |
| JPMORGAN CHASE & CO | 0.2% | 293,168 | -62% | 0% | $542,361 |
| Woodline Partners LP | 0.2% | 285,714 | -90% | 0% | $528,571 |
| CITADEL ADVISORS LLC | 0.2% | 285,134 | -66% | 0% | $527,498 |
| Bank of New York Mellon Corp | 0.19% | 268,645 | +1.9% | 0% | $496,993 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 57,293,181 | $105,777,708 | -$9,466,575 | $1.85 | 127 |
| 2025 Q3 | 62,966,561 | $100,537,605 | +$12,809,155 | $1.60 | 139 |
| 2025 Q2 | 55,028,248 | $95,538,152 | -$30,177,530 | $1.74 | 142 |
| 2025 Q1 | 63,239,232 | $151,919,353 | -$2,099,490 | $2.40 | 148 |
| 2024 Q4 | 63,382,072 | $224,374,988 | -$2,204,897 | $3.54 | 161 |
| 2024 Q3 | 79,658,040 | $334,361,661 | +$4,940,077 | $4.23 | 160 |
| 2024 Q2 | 79,082,289 | $293,789,491 | -$22,676,741 | $3.75 | 154 |
| 2024 Q1 | 83,603,596 | $450,161,135 | -$1,041,679 | $5.42 | 151 |
| 2023 Q4 | 83,756,153 | $513,879,428 | -$6,358,794 | $6.17 | 155 |
| 2023 Q3 | 68,671,481 | $355,812,525 | +$6,545,772 | $5.19 | 146 |
| 2023 Q2 | 67,366,149 | $338,275,965 | +$9,139,522 | $5.03 | 139 |
| 2023 Q1 | 66,221,011 | $243,264,177 | +$5,201,932 | $3.68 | 138 |
| 2022 Q4 | 65,164,685 | $234,990,736 | +$222,348,609 | $3.60 | 145 |
| 2022 Q3 | 1,101,548 | $11,247,000 | +$11,247,000 | $10.21 | 1 |