OmniAb, Inc. (OABI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

107,911,864Shares Outstanding

14,729,394Shares held by institutions

$25,187,264Value of institutional holdings

52.87%Institutional ownership %

-6.73%Shares Changed QoQ

122No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

According to SEC filings for the period ending December 2025, OmniAb, Inc. (NASDAQ:OABI) is held by 122 institutional firms.

These investors collectively held 52.9% of the company's total shares outstanding in December 2025, down from 58.3% in September 2025.
On a quarter-over-quarter basis, institutional holdings shifted by -6.73%, with a year-over-year a decrease of 24.69% in the count of filers.
The latest 13F cycle for OmniAb reveals that of 122 total investors, 52 funds grew their exposure, whereas 38 reduced theirs and 32 made no changes.
This class of investors decreased its holdings in OmniAb to 57.06Mn shares for the 13F-cycle ending December 2025, down by 4.12Mn shares quarter on quarter, and down 6.48Mn shares year over year.
As of December 31, 2025, Whitefort Capital Management, LP held OmniAb's largest shareholding position with over 14.22Mn shares, representing 13.18% of total outstanding shares.
Among the most significant buyers of OmniAb during December 2025 were BlackRock, Inc. (1.10Mn), CADIAN CAPITAL MANAGEMENT, LP (759.39K), VANGUARD GROUP INC (477.14K), GEODE CAPITAL MANAGEMENT, LLC (396.46K), MILLENNIUM MANAGEMENT LLC (387.59K).
Leading sellers of OmniAb stock in December 2025 included Woodline Partners LP (2.57Mn), Stonepine Capital Management, LLC (1.44Mn), JACOBS LEVY EQUITY MANAGEMENT, INC (768.07K), CITADEL ADVISORS LLC (551.66K), JPMORGAN CHASE & CO (469.74K).
The top 10 institutional holders of OmniAb for the quarter ending December 2025 included Whitefort Capital Management, LP (14.22Mn), BlackRock, Inc. (8.06Mn), VANGUARD GROUP INC (5.63Mn), CADIAN CAPITAL MANAGEMENT, LP (4.43Mn), GEODE CAPITAL MANAGEMENT, LLC (2.72Mn), PRIVATE MANAGEMENT GROUP INC (2.42Mn), RICE HALL JAMES & ASSOCIATES, LLC (2.40Mn), DIMENSIONAL FUND ADVISORS LP (2.15Mn), STATE STREET CORP (2.05Mn), TOWERVIEW LLC (1.00Mn).

122 Institutional Holders

14,729,394 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
Whitefort Capital Management, LP	31 Dec, 2025	14,223,658	0	0.00%	$26,313,767.00
BlackRock, Inc.	31 Dec, 2025	8,064,981	1,100,759	15.81%	$14,920,215.00
VANGUARD GROUP INC	31 Dec, 2025	5,625,197	477,136	9.27%	$10,406,615.00
CADIAN CAPITAL MANAGEMENT, LP	31 Dec, 2025	4,434,954	759,386	20.66%	$8,204,665.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	2,722,692	396,456	17.04%	$5,037,854.00
PRIVATE MANAGEMENT GROUP INC	31 Dec, 2025	2,420,478	-97,801	-3.88%	$4,477,884.00
RICE HALL JAMES & ASSOCIATES, LLC	31 Dec, 2025	2,401,088	-10,950	-0.45%	$4,442,013.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	2,152,593	-395,691	-15.53%	$3,982,373.00
STATE STREET CORP	31 Dec, 2025	2,048,996	-45,850	-2.19%	$3,790,643.00
TOWERVIEW LLC	31 Dec, 2025	1,000,000	168,900	20.32%	$1,850,000.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	966,026	180,549	22.99%	$1,787,148.00
Nuveen, LLC	31 Dec, 2025	874,512	2	0.00%	$1,617,847.00
NORTHERN TRUST CORP	31 Dec, 2025	829,021	10,555	1.29%	$1,533,688.00
ISTHMUS PARTNERS, LLC	31 Dec, 2025	721,309	52,238	7.81%	$1,334,422.00
ADAR1 Capital Management, LLC	31 Dec, 2025	702,190	-388,438	-35.62%	$1,299,052.00
Stonepine Capital Management, LLC	31 Dec, 2025	701,000	-1,441,857	-67.29%	$1,296,850.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	673,395	387,594	135.62%	$1,020,909.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	540,277	-47,509	-8.08%	$999,513.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	423,104	131,369	45.03%	$782,742.00
MORGAN STANLEY	31 Dec, 2025	389,687	-430,535	-52.49%	$720,922.00

1 - 20 of 122

Research Tools