OmniAb OABI Institutional Ownership

NASDAQ OABI

$4.74 +0.00 (+0.00%)

At close: Sep 29, 2026 · 4:00 PM EDT

Institutions by Trading Activity

131 Institutions

Increased 77 58.8%

Unchanged 21 16.0%

Reduced 33 25.2%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

46.39%

▲+2.78 pp QoQ

Shares Held by Institutions

59.75Mn

of 128.80Mn outstanding

▲+7.47% QoQ

Shares Outstanding

128.80Mn

69.05Mn held outside 13F filers

Institutional Investors

131

filed 13F for Jun 2026

▲+3 vs prior quarter

Net Shares Added (QoQ)

+4.16Mn

accumulated since last quarter

Value of Holdings

$283.20Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

OmniAb, Inc. (NASDAQ:OABI) has 131 institutional investors that have filed 13F reports for the period ending June 2026.

They owned 46.4% of outstanding stock in June 2026, up from 43.6% the prior quarter.
Their total shares held in OABI increased 7.47% quarter over quarter, and separately, investors owning OmniAb decreased 7.09% from a year ago.
Of these 131 holders, 77 added to their stakes in OmniAb, 33 trimmed positions, and 21 made no changes.
Institutional investors collectively held 59.75Mn shares in OmniAb as of June 2026, up by 4.16Mn shares quarter on quarter, and up 7.65Mn shares year over year.
Whitefort Capital Management, LP is the top holder of OmniAb as of June 30, 2026, with 10.25Mn shares representing 7.96% of outstanding stock.
Top purchasers of OABI stock for the quarter ending June 2026 included Nomura Holdings Inc (4.32Mn), Sixth Street Partners Management Company, L.P. (966.88K), BlackRock, Inc. (790.61K), MACKENZIE FINANCIAL CORP (489.13K), RENAISSANCE TECHNOLOGIES LLC (330.75K).
The largest sellers of OmniAb for the quarter ending June 2026 were Whitefort Capital Management, LP (3.97Mn), DIMENSIONAL FUND ADVISORS LP (483.15K), CITADEL ADVISORS LLC (170.49K), VANGUARD CAPITAL MANAGEMENT LLC (141.3K), UBS Group AG (84.66K).
Per Business Quant, the top 10 investors in OABI for the quarter ending June 2026 include Whitefort Capital Management, LP (10.25Mn), BlackRock, Inc. (8.9Mn), Nomura Holdings Inc (5.03Mn), CADIAN CAPITAL MANAGEMENT, LP (4.21Mn), VANGUARD CAPITAL MANAGEMENT LLC (3.85Mn), GEODE CAPITAL MANAGEMENT, LLC (2.88Mn), RICE HALL JAMES & ASSOCIATES, LLC (2.61Mn), PRIVATE MANAGEMENT GROUP INC (2.34Mn), State Street Corp (2.13Mn), DIMENSIONAL FUND ADVISORS LP (1.26Mn).

Form 13F Holdings

131 Institutional Holders

Report period 30 Jun, 2026

Total shares held 59.75Mn

Of outstanding 46.39%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Whitefort Capital Management, LP	0001884931	10,248,658	7.96%	▼3,975,000	-27.95%	$25.21Mn
2	BlackRock, Inc.	0002012383	8,897,490	6.91%	▲790,609	+9.75%	$21.89Mn
3	Nomura Holdings Inc	0001163653	5,028,160	3.90%	▲4,323,112	+613.17%	$12.37Mn
4	CADIAN CAPITAL MANAGEMENT, LP	0001423686	4,211,821	3.27%	▲54,692	+1.32%	$10.36Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	3,852,356	2.99%	▼141,296	-3.54%	$9.48Mn
6	GEODE CAPITAL MANAGEMENT, LLC	0001214717	2,883,978	2.24%	▼41,601	-1.42%	$7.10Mn
7	RICE HALL JAMES & ASSOCIATES, LLC	0001230765	2,610,434	2.03%	▲63,179	+2.48%	$6.42Mn
8	PRIVATE MANAGEMENT GROUP INC	0001142031	2,344,770	1.82%	▼84,396	-3.47%	$5.77Mn
9	State Street Corp	0000093751	2,133,549	1.66%	▲66,406	+3.21%	$5.25Mn
10	DIMENSIONAL FUND ADVISORS LP	0000354204	1,262,099	0.98%	▼483,149	-27.68%	$3.11Mn
11	TOWERVIEW LLC	0001166573	1,180,000	0.92%	▲180,000	+18.00%	$2.90Mn
12	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	980,416	0.76%	▲76,617	+8.48%	$2.41Mn
13	Sixth Street Partners Management Company, L.P.	0001812095	966,877	0.75%	▲966,877	0.00%	$2.38Mn
13	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	966,877	0.75%	▲7,304	+0.76%	$2.38Mn
14	Northern Trust Corp	0000073124	948,294	0.74%	▲67,399	+7.65%	$2.33Mn
15	ADAR1 Capital Management, LLC	0001940272	947,412	0.74%	▲242,222	+34.35%	$2.33Mn
16	ISTHMUS PARTNERS, LLC	0001639666	803,428	0.62%	▲46,754	+6.18%	$1.98Mn
17	VANGUARD FIDUCIARY TRUST CO	0000933478	758,460	0.59%	▲32,852	+4.53%	$1.87Mn
18	TWO SIGMA INVESTMENTS, LP	0001179392	657,432	0.51%	▲144,691	+28.22%	$1.62Mn
19	Nuveen, LLC	0001871926	642,811	0.50%	▲18,935	+3.04%	$1.58Mn

Showing 1 to 20 of 131 holders