OmniAb, Inc.
OABI- Exchange
- Nasdaq
- Industry
- Services-Commercial Physical & Biological Research
- SEC CIK
- 0001846253
No open-market purchases or sales by OmniAb, Inc. insiders were filed in the last 90 days; 131 institutions reported holding it in 13F filings for Q2 2026, worth $144.2M in total; no superinvestor holds it.
Other share classesOABIW
13F holders, Q1 2026
Institutional positions in OmniAb, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 128
- +2 vs. Q4 2025
- Shares held
- 56.0M
- +4.28M (+8.3%) vs. Q4 2025
- Total value
- $87.7M
- −$7.68M (−8.1%) vs. Q4 2025
- New holders
- 24
- 42 more added
- Sold out
- 22
- 38 more reduced
3 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting OABI on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 131 | $144.2M |
| Q1 2026 | 128 | $87.7M |
| Q4 2025 | 129 | $105.8M |
| Q3 2025 | 140 | $100.5M |
| Q2 2025 | 144 | $95.5M |
| Q1 2025 | 153 | $152.0M |
| Q4 2024 | 165 | $224.7M |
| Q3 2024 | 165 | $334.6M |
| Q2 2024 | 160 | $293.9M |
| Q1 2024 | 153 | $450.4M |
| Q4 2023 | 157 | $514.0M |
| Q3 2023 | 148 | $355.9M |
| Q2 2023 | 144 | $338.6M |
| Q1 2023 | 142 | $243.3M |
| Q4 2022 | 148 | $234.9M |
| Q3 2022 | 1 | $11.2M |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding OmniAb, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Citadel Advisors LLC | 228,684 | $359.0K | 0.00% | −56,450−19.8% | Reduced |
| TLS Advisors LLC | 250,185 | $393.0K | 0.93% | +180,185+257.4% | Added |
| Renaissance Technologies LLC | 269,600 | $423.3K | 0.00% | +26,900+11.1% | Added |
| Bank of New York Mellon Corp | 274,451 | $430.9K | 0.00% | +5,806+2.2% | Added |
| D. E. Shaw & Co., Inc. | 380,254 | $597.0K | 0.00% | −2,898−0.8% | Reduced |
| Millennium Management LLC | 523,918 | $629.7K | 0.00% | −149,477−22.2% | Reduced |
| Morgan Stanley | 407,933 | $640.5K | 0.00% | +18,246+4.7% | Added |
| Goldman Sachs Group Inc | 419,024 | $657.9K | 0.00% | −121,253−22.4% | Reduced |
| Two Sigma Investments, LP | 512,741 | $805.0K | 0.00% | +89,637+21.2% | Added |
| Nuveen, LLC | 623,876 | $979.5K | 0.00% | −250,636−28.7% | Reduced |
| Nomura Holdings Inc | 705,048 | $1.11M | 0.01% | +550,097+355.0% | Added |
| ADAR1 Capital Management, LLC | 705,190 | $1.11M | 0.07% | +3,000+0.4% | Added |
| Vanguard Fiduciary Trust Co | 725,608 | $1.14M | 0.00% | +725,608 | New |
| Isthmus Partners, LLC | 756,674 | $1.19M | 0.12% | +35,365+4.9% | Added |
| Northern Trust Corp | 880,895 | $1.38M | 0.00% | +51,874+6.3% | Added |
| Vanguard Portfolio Management LLC | 903,799 | $1.42M | 0.00% | +903,799 | New |
| Charles Schwab Investment Management Inc | 959,573 | $1.51M | 0.00% | −6,453−0.7% | Reduced |
| Towerview LLC | 1,000,000 | $1.57M | 1.01% | 00.0% | Unchanged |
| Dimensional Fund Advisors LP | 1,745,248 | $2.74M | 0.00% | −407,345−18.9% | Reduced |
| State Street Corp | 2,067,143 | $3.25M | 0.00% | +18,147+0.9% | Added |
| Private Management Group Inc | 2,429,166 | $3.81M | 0.11% | +8,688+0.4% | Added |
| Rice Hall James & Associates, LLC | 2,547,255 | $4.00M | 0.22% | +146,167+6.1% | Added |
| Geode Capital Management, LLC | 2,925,579 | $4.59M | 0.00% | +202,887+7.5% | Added |
| Vanguard Capital Management LLC | 3,993,652 | $6.27M | 0.00% | +3,993,652 | New |
| Cadian Capital Management, LP | 4,157,129 | $6.53M | 0.79% | −277,825−6.3% | Reduced |
| BlackRock, Inc. | 8,106,881 | $12.7M | 0.00% | +41,900+0.5% | Added |
| Whitefort Capital Management, LP | 14,223,658 | $22.3M | 6.80% | 00.0% | Unchanged |
| SRS Capital Advisors, Inc. | 8 | – | – | −16−66.7% | Reduced |
| Woodline Partners LP | 0 | $0 | 0.00% | −285,714−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −197,530−100.0% | Sold out |
| Connors Investor Services Inc | 0 | $0 | 0.00% | −61,941−100.0% | Sold out |
| Boothbay Fund Management, LLC | 0 | $0 | 0.00% | −47,596−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −47,625−100.0% | Sold out |
| Ameriprise Financial Inc | 0 | $0 | 0.00% | −32,749−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −24,415−100.0% | Sold out |
| SG Americas Securities, LLC | 0 | $0 | 0.00% | −23,141−100.0% | Sold out |
| Algert Global LLC | 0 | $0 | 0.00% | −20,498−100.0% | Sold out |
| BBR Partners, LLC | 0 | $0 | 0.00% | −20,000−100.0% | Sold out |
| Public Employees Retirement System of Ohio | 0 | $0 | 0.00% | −15,321−100.0% | Sold out |
| Nelson, Van Denburg & Campbell Wealth Management Group, LLC | 0 | $0 | 0.00% | −10,704−100.0% | Sold out |
| Amalgamated Bank | 0 | $0 | 0.00% | −3,304−100.0% | Sold out |
| Smartleaf Asset Management LLC | 0 | $0 | 0.00% | −2,458−100.0% | Sold out |
| Spire Wealth Management | 0 | $0 | 0.00% | −1,200−100.0% | Sold out |
| Daiwa Securities Group Inc. | 0 | $0 | 0.00% | −475−100.0% | Sold out |
| St Germain D J Co Inc | 0 | $0 | 0.00% | −367−100.0% | Sold out |
| GWM Advisors LLC | 0 | $0 | 0.00% | −189−100.0% | Sold out |
| Scarborough Advisors, LLC | 0 | $0 | 0.00% | −161−100.0% | Sold out |
| Northwestern Mutual Wealth Management Co | 0 | $0 | 0.00% | −29−100.0% | Sold out |
| American Capital Advisory, LLC | 0 | $0 | 0.00% | −19−100.0% | Sold out |
| Covestor Ltd | 0 | $0 | 0.00% | −19−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| CIBC Private Wealth Group, LLC | – | – | – | – | Not filed |
| Comerica Bank | – | – | – | – | Not filed |