OABI OmniAb, Inc.
OmniAb, Inc. (OABI) Institutional Ownership
What the institutions did with OABI last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| Whitefort Capital Management, LP | 10.2M | 16.5% |
| BlackRock, Inc. | 8.9M | 14.3% |
| NOMURA HOLDINGS INC | 5.0M | 8.1% |
| CADIAN CAPITAL MANAGEMENT, LP | 4.2M | 6.8% |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.9M | 6.2% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.9M | 4.7% |
| RICE HALL JAMES & ASSOCIATES, LLC | 2.6M | 4.2% |
| PRIVATE MANAGEMENT GROUP INC | 2.3M | 3.8% |
| STATE STREET CORP | 2.1M | 3.4% |
| DIMENSIONAL FUND ADVISORS LP | 1.3M | 2.0% |
| TOWERVIEW LLC | 1.2M | 1.9% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 980.4K | 1.6% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 966.9K | 1.6% |
| NORTHERN TRUST CORP | 948.3K | 1.5% |
| ADAR1 Capital Management, LLC | 947.4K | 1.5% |
| LMR Partners LLP | 897.4K | 1.4% |
| ISTHMUS PARTNERS, LLC | 803.4K | 1.3% |
| VANGUARD FIDUCIARY TRUST CO | 758.5K | 1.2% |
| ARISTEIA CAPITAL, L.L.C. | 679.9K | 1.1% |
| TWO SIGMA INVESTMENTS, LP | 657.4K | 1.1% |
| Nuveen, LLC | 642.8K | 1.0% |
| RENAISSANCE TECHNOLOGIES LLC | 600.4K | 1.0% |
| Arbiter Partners Capital Management LLC | 577.8K | 0.9% |
| D. E. Shaw & Co., Inc. | 559.4K | 0.9% |
| MACKENZIE FINANCIAL CORP | 489.1K | 0.8% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| NOMURA HOLDINGS INC | Increased | 705.0K | 5.0M | +4.3M |
| Whitefort Capital Management, LP | Reduced | 14.2M | 10.2M | -4.0M |
| LMR Partners LLP | New | 0 | 897.4K | +897.4K |
| BlackRock, Inc. | Increased | 8.1M | 8.9M | +790.6K |
| ARISTEIA CAPITAL, L.L.C. | New | 0 | 679.9K | +679.9K |
| MACKENZIE FINANCIAL CORP | New | 0 | 489.1K | +489.1K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 1.7M | 1.3M | -483.1K |
| Hudson Bay Capital Management LP | New | 0 | 465.2K | +465.2K |
| Arbiter Partners Capital Management LLC | Increased | 192.6K | 577.8K | +385.2K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 269.6K | 600.4K | +330.8K |
| Sculptor Capital LP | New | 0 | 293.8K | +293.8K |
| ADAR1 Capital Management, LLC | Increased | 705.2K | 947.4K | +242.2K |
| Calamos Advisors LLC | New | 0 | 200.0K | +200.0K |
| TOWERVIEW LLC | Increased | 1.0M | 1.2M | +180.0K |
| D. E. Shaw & Co., Inc. | Increased | 380.3K | 559.4K | +179.2K |
| CITADEL ADVISORS LLC | Reduced | 228.7K | 58.2K | -170.5K |
| Stonepine Capital Management, LLC | Sold Out | 164.0K | 0 | -164.0K |
| Palumbo Wealth Management LLC | New | 0 | 162.0K | +162.0K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | New | 0 | 159.6K | +159.6K |
| MMCAP International Inc. SPC | New | 0 | 158.3K | +158.3K |
| TWO SIGMA INVESTMENTS, LP | Increased | 512.7K | 657.4K | +144.7K |
| Walleye Capital LLC | New | 0 | 144.4K | +144.4K |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 4.0M | 3.9M | -141.3K |
| ACADIAN ASSET MANAGEMENT LLC | New | 0 | 132.4K | +132.4K |
| PRIVATE MANAGEMENT GROUP INC | Reduced | 2.4M | 2.3M | -84.4K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 903.8K | 980.4K | +76.6K |
| NORTHERN TRUST CORP | Increased | 880.9K | 948.3K | +67.4K |
| STATE STREET CORP | Increased | 2.1M | 2.1M | +66.4K |
| UBS Group AG | Reduced | 102.5K | 37.6K | -64.9K |
| RICE HALL JAMES & ASSOCIATES, LLC | Increased | 2.5M | 2.6M | +63.2K |
| Connor, Clark & Lunn Investment Management Ltd. | Increased | 14.1K | 72.4K | +58.2K |
| Thrivent Financial for Lutherans | New | 0 | 55.3K | +55.3K |
| CADIAN CAPITAL MANAGEMENT, LP | Increased | 4.2M | 4.2M | +54.7K |
| CSS LLC/IL | New | 0 | 54.7K | +54.7K |
| Russell Investments Group, Ltd. | Increased | 10.8K | 63.8K | +53.0K |
| WELLS FARGO & COMPANY/MN | Increased | 50.1K | 100.2K | +50.1K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 523.9K | 474.2K | -49.8K |
| ISTHMUS PARTNERS, LLC | Increased | 756.7K | 803.4K | +46.8K |
| CITIGROUP INC | Increased | 9.8K | 54.7K | +44.9K |
| Bank of New York Mellon Corp | Increased | 274.5K | 318.4K | +44.0K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Sold Out | 43.0K | 0 | -43.0K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 115.6K | 157.7K | +42.1K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 2.9M | 2.9M | -41.6K |
| AMERICAN CENTURY COMPANIES INC | Increased | 34.8K | 75.1K | +40.3K |
| MORGAN STANLEY | Reduced | 407.9K | 371.5K | -36.4K |
| GOLDMAN SACHS GROUP INC | Reduced | 419.0K | 384.6K | -34.5K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 725.6K | 758.5K | +32.9K |
| TLS Advisors LLC | Reduced | 250.2K | 220.7K | -29.5K |
| XTX Topco Ltd | Increased | 44.7K | 73.9K | +29.2K |
| NINE MASTS CAPITAL Ltd | Sold Out | 29.1K | 0 | -29.1K |
| BANK OF AMERICA CORP /DE/ | Increased | 121.7K | 149.5K | +27.8K |
| WOLVERINE ASSET MANAGEMENT LLC | New | 0 | 27.6K | +27.6K |
| JANE STREET GROUP, LLC | Sold Out | 27.6K | 0 | -27.6K |
| Tower Research Capital LLC (TRC) | Reduced | 35.3K | 8.0K | -27.3K |
| Invesco Ltd. | Increased | 135.1K | 161.4K | +26.3K |
| Squarepoint Ops LLC | Increased | 10.0K | 35.4K | +25.3K |
| State of Wyoming | Sold Out | 24.7K | 0 | -24.7K |
| Qube Research & Technologies Ltd | New | 0 | 20.2K | +20.2K |
| PRUDENTIAL FINANCIAL INC | Increased | 19.3K | 39.0K | +19.7K |
| Police & Firemen's Retirement System of New Jersey | Increased | 22.6K | 42.2K | +19.6K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.