Latest Period
Q4 2025
Security Snapshot
OmniAb, Inc. - Common Stock, par value $0.0001 per share (OABI) Institutional Ownership
CUSIP: 68218J103
13F Institutional Holders and Ownership History from Q3 2022 to Q1 2026
Institutions Reporting
129
Shares (Excl. Options)
57,293,183
Price
$1.85
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- Type / Class
- Equity / Common Stock, par value $0.0001 per share
- Symbol
- OABI on Nasdaq
- Shares outstanding
- 144,611,435
- Price per share
- $1.50
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 57,293,183
- Total reported value
- $105,777,712
- % of total 13F portfolios
- 0%
- Share change
- -5,163,859
- Value change
- -$9,466,573
- Number of holders
- 129
- Price from insider filings
- $1.50
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- OABI - OmniAb, Inc. - Common Stock, par value $0.0001 per share is tracked under CUSIP 68218J103.
- 129 institutions reported positions in Q4 2025.
- 3 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 129 to 27 between Q4 2025 and Q1 2026.
- Reported value moved from $105,777,712 to $2,436,365.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 129 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 68218J103?
CUSIP 68218J103 identifies OABI - OmniAb, Inc. - Common Stock, par value $0.0001 per share in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 68218J103:
Significant Owners of OmniAb, Inc. - Common Stock, par value $0.0001 per share (OABI) based on Schedule 13D/G filings
| 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, 129 institutional investors reported holding 57,293,183 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.
Top 25 Institutional Shareholders
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 |
Institutional Holders of OmniAb, Inc. - Common Stock, par value $0.0001 per share (OABI) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 1,551,825 | $2,436,365 | -$390,187 | $1.57 | 27 |
| 2025 Q4 | 57,293,183 | $105,777,712 | -$9,466,573 | $1.85 | 129 |
| 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 |