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.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| Whitefort Capital Management, LP | 10.2M | 16.6% |
| BlackRock, Inc. | 8.9M | 14.4% |
| 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 | 3.5% |
| 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 | 1.5% |
| 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% |
| D. E. Shaw & Co., Inc. | 559.4K | 0.9% |
| MACKENZIE FINANCIAL CORP | 489.1K | 0.8% |
| MILLENNIUM MANAGEMENT LLC | 474.2K | 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 |
| 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 |
| Arbiter Partners Capital Management LLC | Increased | 192.6K | 385.2K | +192.6K |
| 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 |
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.