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Buy Day today: Good (62) Broad market participation · no major macro event
OABI

OmniAb Inc.

Healthcare · Biotechnology

4.40$ +2.1% vs. previous close Closing price · As of: Sep 17, 2026

Ownership

Ownership Structure

Who owns OmniAb Inc. (OABI)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 81.3% of the shares are freely tradable; institutional investors hold 51.0%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 51.0%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 15.3%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 81.3%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 4.5%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 145Mio.

Largest Shareholders

Institutions

Institutions OABI
Name Stake (%) Shares Change (%) Date
Whitefort Capital Management, LP. 7.05 10,248,658 -27.9 06/30/2026
BlackRock Inc 5.58 8,106,881 +0.5 03/31/2026
Nomura Holdings Inc 3.46 5,028,160 +613.2 06/30/2026
Cadian Capital Management LP 2.90 4,211,821 +1.3 06/30/2026
Vanguard Capital Management, LLC 2.75 3,993,652 +0.0 03/31/2026
Geode Capital Management, LLC 2.01 2,925,579 +7.5 03/31/2026
Rice Hall James & Associates, LLC 1.80 2,610,434 +2.5 06/30/2026
Private Management Group Inc 1.67 2,429,166 +0.4 03/31/2026

Funds

Funds OABI
Name Stake (%) Shares Change (%) Date
iShares Russell 2000 ETF 1.89 2,753,040 -0.6 08/31/2026
Vanguard MStar Total Stk Mkt Idx Invest 1.64 2,379,734 +0.0 07/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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