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, Q3 2025
Institutional positions in OmniAb, Inc. as of Sep 30, 2025. 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
- 140
- −2 vs. Q2 2025
- Shares held
- 63.0M
- +8.06M (+14.7%) vs. Q2 2025
- Total value
- $100.5M
- +$5.21M (+5.5%) vs. Q2 2025
- New holders
- 16
- 33 more added
- Sold out
- 18
- 52 more reduced
2 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding OmniAb, Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Bridgeway Capital Management, LLC | 153,900 | $246.2K | 0.01% | +100,000+185.5% | Added |
| FMR LLC | 154,546 | $247.3K | 0.00% | +16,745+12.2% | Added |
| Arbiter Partners Capital Management LLC | 160,529 | $256.8K | 0.18% | +160,529 | New |
| Rhumbline Advisers | 160,936 | $257.5K | 0.00% | +208+0.1% | Added |
| Millennium Management LLC | 285,801 | $260.1K | 0.00% | −364,515−56.1% | Reduced |
| Graham Capital Management, L.P. | 167,172 | $267.5K | 0.01% | +167,172 | New |
| D. E. Shaw & Co., Inc. | 186,281 | $298.0K | 0.00% | +186,281 | New |
| Jane Street Group, LLC | 189,082 | $302.5K | 0.00% | +35,346+23.0% | Added |
| Ameriprise Financial Inc | 232,787 | $372.5K | 0.00% | −47,002−16.8% | Reduced |
| TLS Advisors LLC | 250,185 | $388.0K | 1.13% | 00.0% | Unchanged |
| Gsa Capital Partners LLP | 262,371 | $420.0K | 0.04% | +236,197+902.4% | Added |
| Bank of New York Mellon Corp | 263,698 | $421.9K | 0.00% | −7,053−2.6% | Reduced |
| Two Sigma Investments, LP | 291,735 | $466.8K | 0.00% | +60,047+25.9% | Added |
| Tang Capital Management LLC | 300,000 | $480.0K | 0.02% | 00.0% | Unchanged |
| Royal Bank of Canada | 303,163 | $485.0K | 0.00% | −38,832−11.4% | Reduced |
| Woodstock Corp | 351,753 | $562.8K | 0.05% | −269,931−43.4% | Reduced |
| Kent Lake PR LLC | 500,000 | $800.0K | 0.41% | −1,250,000−71.4% | Reduced |
| Renaissance Technologies LLC | 523,454 | $837.5K | 0.00% | −184,096−26.0% | Reduced |
| Goldman Sachs Group Inc | 587,786 | $940.5K | 0.00% | +281,740+92.1% | Added |
| Isthmus Partners, LLC | 669,071 | $1.07M | 0.24% | +101,028+17.8% | Added |
| JPMorgan Chase & Co | 762,912 | $1.22M | 0.00% | −30,822−3.9% | Reduced |
| Charles Schwab Investment Management Inc | 785,477 | $1.26M | 0.00% | −46,797−5.6% | Reduced |
| Northern Trust Corp | 818,466 | $1.31M | 0.00% | −18,403−2.2% | Reduced |
| Morgan Stanley | 820,222 | $1.31M | 0.00% | +52,601+6.9% | Added |
| Towerview LLC | 831,100 | $1.33M | 0.97% | 00.0% | Unchanged |
| Citadel Advisors LLC | 836,799 | $1.34M | 0.00% | −1,295,793−60.8% | Reduced |
| Nuveen, LLC | 874,510 | $1.40M | 0.00% | +387,249+79.5% | Added |
| Jacobs Levy Equity Management, Inc | 1,006,256 | $1.61M | 0.01% | −99,268−9.0% | Reduced |
| ADAR1 Capital Management, LLC | 1,090,628 | $1.75M | 0.17% | +764,520+234.4% | Added |
| State Street Corp | 2,094,846 | $3.35M | 0.00% | +83,937+4.2% | Added |
| Stonepine Capital Management, LLC | 2,142,857 | $3.43M | 2.79% | +2,142,857 | New |
| Geode Capital Management, LLC | 2,326,236 | $3.72M | 0.00% | −113,188−4.6% | Reduced |
| Rice Hall James & Associates, LLC | 2,412,038 | $3.86M | 0.21% | −215,085−8.2% | Reduced |
| Private Management Group Inc | 2,518,279 | $4.03M | 0.12% | −39,766−1.6% | Reduced |
| Dimensional Fund Advisors LP | 2,548,284 | $4.08M | 0.00% | −365,480−12.5% | Reduced |
| Woodline Partners LP | 2,857,142 | $4.57M | 0.02% | +2,857,142 | New |
| Cadian Capital Management, LP | 3,675,568 | $5.88M | 0.35% | +3,675,568 | New |
| Vanguard Group Inc | 5,148,061 | $8.24M | 0.00% | −120,254−2.3% | Reduced |
| BlackRock, Inc. | 6,964,222 | $11.1M | 0.00% | −36,957−0.5% | Reduced |
| Whitefort Capital Management, LP | 14,223,658 | $22.8M | 7.53% | +3,983,512+38.9% | Added |
| Royce & Associates LP | 0 | $0 | 0.00% | −867,080−100.0% | Sold out |
| Murchinson Ltd. | 0 | $0 | 0.00% | −502,810−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −359,665−100.0% | Sold out |
| Boothbay Fund Management, LLC | 0 | $0 | 0.00% | −188,554−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −137,171−100.0% | Sold out |
| Mirabella Financial Services LLP | 0 | $0 | 0.00% | −100,381−100.0% | Sold out |
| Manufacturers Life Insurance Company, The | 0 | $0 | 0.00% | −44,809−100.0% | Sold out |
| State Board of Administration of Florida Retirement System | 0 | $0 | 0.00% | −26,753−100.0% | Sold out |
| US Bancorp | 0 | $0 | 0.00% | −20,794−100.0% | Sold out |
| CWC Advisors, LLC. | 0 | $0 | 0.00% | −17,261−100.0% | Sold out |
| Atom Investors LP | 0 | $0 | 0.00% | −12,854−100.0% | Sold out |
| Colony Group, LLC | 0 | $0 | 0.00% | −12,342−100.0% | Sold out |
| Raymond James Financial Inc | 0 | $0 | 0.00% | −7,027−100.0% | Sold out |
| Point72 (DIFC) Ltd | 0 | $0 | 0.00% | −2,741−100.0% | Sold out |
| Geneos Wealth Management Inc. | 0 | $0 | 0.00% | −773−100.0% | Sold out |
| CBIZ Investment Advisory Services, LLC | 0 | $0 | 0.00% | −78−100.0% | Sold out |
| National Bank of Canada | 0 | $0 | 0.00% | −42−100.0% | Sold out |
| South State Corp. | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Northeast Financial Consultants Inc | – | – | – | – | Not filed |
| CIBC World Markets Corp | – | – | – | – | Not filed |