OmniAb, Inc. (OABI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

114,726,000Shares Outstanding

58,436,657Shares held by institutions

$90,869,002Value of institutional holdings

50.94%Institutional ownership %

-6.35%Shares Changed QoQ

125No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

OmniAb, Inc. (NASDAQ:OABI) is held by 125 institutional investors per 13F filings through December 2025.

They owned 50.5% of outstanding stock in December 2025, down from 55.6% the prior quarter.
Their total shares held in OABI decreased -6.79% quarter over quarter, and separately, investors owning OmniAb decreased 22.84% from a year ago.
During the quarter, 54 of these 125 funds increased positions in OABI, 38 reduced exposure, and 33 held steady.
Combined, these investors held 57.9Mn shares in OABI for December 2025, down by 4.21Mn shares quarter on quarter, and down 7.24Mn shares year over year.
As of December 31, 2025, Whitefort Capital Management, LP held the largest stake in OmniAb with 14.22Mn shares, accounting for 12.4% of total shares outstanding.
Leading buyers of OmniAb shares for the quarter ending December 2025 were BlackRock, Inc. (1.1Mn), CADIAN CAPITAL MANAGEMENT, LP (759.39K), Goldman Sachs Group Inc (492.77K), VANGUARD GROUP INC (477.14K), GEODE CAPITAL MANAGEMENT, LLC (396.46K).
Top sellers of OABI stock for the quarter ending December 2025 included Woodline Partners LP (2.57Mn), Stonepine Capital Management, LLC (1.44Mn), Jpmorgan Chase & Co (1.23Mn), JACOBS LEVY EQUITY MANAGEMENT, INC (768.07K), CITADEL ADVISORS LLC (551.66K).
Per Business Quant data, the top 10 holders of OmniAb for the quarter ending December 2025 are 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 (2.4Mn), DIMENSIONAL FUND ADVISORS LP (2.15Mn), State Street Corp (2.05Mn), ADAR1 Capital Management, LLC (1.4Mn).

125 Institutional Holders

58,436,657 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
ADAR1 Capital Management, LLC	31 Dec, 2025	1,404,380	313,752	28.77%	$2,598,104.00
Goldman Sachs Group Inc	31 Dec, 2025	1,080,554	492,768	83.83%	$1,999,026.00
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
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
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

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