Who owns OmniAb, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of OABI from SEC Form 13F filings across 131 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 131 institutions disclosed 58.8M shares of OmniAb, Inc. worth $144.2M — about 45.6% of shares outstanding; the largest disclosed holder is Whitefort Capital Management, LP. Source: SEC Form 13F filings, parsed by EvidInvest.
131
13F holders
$144.2M
value, 2026 filers
45.6%
of shares outstanding (58.8M sh)
22
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of OABI's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Whitefort Capital Management, LP | 10.2M | $25.2M | 6.2% | 8% | -27.9% |
| 2 | BlackRock, Inc. | 8.9M | $21.9M | 0.0% | 6.9% | +9.8% |
| 3 | NOMURA HOLDINGS INC | 5.0M | $12.4M | 0.0% | 3.9% | +613.2% |
| 4 | CADIAN CAPITAL MANAGEMENT, LP | 4.2M | $10.4M | 0.8% | 3.3% | +1.3% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 3.9M | $9.5M | 0.0% | 3% | -3.5% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 2.9M | $7.1M | 0.0% | 2.2% | -1.4% |
| 7 | RICE HALL JAMES & ASSOCIATES, LLC | 2.6M | $6.4M | 0.3% | 2% | +2.5% |
| 8 | PRIVATE MANAGEMENT GROUP INC | 2.3M | $5.8M | 0.2% | 1.8% | -3.5% |
| 9 | STATE STREET CORP | 2.1M | $5.2M | 0.0% | 1.7% | +3.2% |
| 10 | DIMENSIONAL FUND ADVISORS LP | 1.3M | $3.1M | 0.0% | 1% | -27.7% |
| 11 | TOWERVIEW LLC | 1.2M | $2.9M | 1.9% | 0.9% | +18.0% |
| 12 | VANGUARD PORTFOLIO MANAGEMENT LLC | 980,416 | $2.4M | 0.0% | 0.8% | +8.5% |
| 13 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 966,877 | $2.4M | 0.0% | 0.8% | +0.8% |
| 14 | NORTHERN TRUST CORP | 948,294 | $2.3M | 0.0% | 0.7% | +7.7% |
| 15 | ADAR1 Capital Management, LLC | 947,412 | $2.3M | 0.1% | 0.7% | +34.3% |
| 16 | ISTHMUS PARTNERS, LLC | 803,428 | $2.0M | 0.2% | 0.6% | +6.2% |
| 17 | VANGUARD FIDUCIARY TRUST CO | 758,460 | $1.9M | 0.0% | 0.6% | +4.5% |
| 18 | TWO SIGMA INVESTMENTS, LP | 657,432 | $1.6M | 0.0% | 0.5% | +28.2% |
| 19 | Nuveen, LLC | 642,811 | $1.6M | 0.0% | 0.5% | +3.0% |
| 20 | RENAISSANCE TECHNOLOGIES LLC | 600,350 | $1.5M | 0.0% | 0.5% | +122.7% |
| 21 | D. E. Shaw & Co., Inc. | 559,404 | $1.4M | 0.0% | 0.4% | +47.1% |
| 22 | MACKENZIE FINANCIAL CORPNEW | 489,134 | $1.2M | 0.0% | 0.4% | new |
| 23 | MILLENNIUM MANAGEMENT LLC | 474,159 | $864,306 | 0.0% | 0.4% | -9.5% |
| 24 | GOLDMAN SACHS GROUP INC | 384,573 | $946,049 | 0.0% | 0.3% | -8.2% |
| 25 | MORGAN STANLEY | 371,506 | $913,905 | 0.0% | 0.3% | -8.9% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.