OmniAb OABI Institutional Ownership

NASDAQ OABI

$4.69 +0.10 (+2.18%)

At close: Oct 19, 2026 · 4:00 PM EDT

Institutions by Trading Activity

130 Institutions

Increased 76 58.5%

Unchanged 21 16.2%

Reduced 33 25.4%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

45.64%

▲+2.02 pp QoQ

Shares Held by Institutions

58.78Mn

of 128.80Mn outstanding

▲+5.09% QoQ

Shares Outstanding

128.80Mn

70.01Mn held outside 13F filers

Institutional Investors

130

filed 13F for Jun 2026

▲+2 vs prior quarter

Net Shares Added (QoQ)

+2.85Mn

accumulated since last quarter

Value of Holdings

$278.03Mn

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

Updated Oct 11, 2026

OmniAb, Inc. (NASDAQ:OABI) counted 130 institutional investors among its 13F-reported shareholders for the quarter ended June 30, 2026.

These investors held 45.64% of OmniAb's outstanding shares at the end of Q2 2026, up from 43.61% in Q1 2026.
Total holdings of OmniAb shares rose 5.09% from Q1 2026, and the number of holders fell 7.14% from Q2 2025.
Among the 130 holders of OmniAb, 76 added to their positions, 33 reduced their stakes and 21 left their positions unchanged.
In total, institutional investors held 58.78Mn shares of OmniAb at the end of Q2 2026, up 2.85Mn from the prior quarter and up 6.68Mn from a year earlier.
Whitefort Capital Management, LP led 13F holders of OABI with 10.25Mn shares as of June 30, 2026, or 7.96% of shares outstanding.
Holders that added the most shares of OmniAb in Q2 2026 were Nomura Holdings Inc (+4.32Mn shares), BlackRock, Inc. (+790.61K shares), Renaissance Technologies LLC (+330.75K shares), ADAR1 Capital Management, LLC (+242.22K shares) and Towerview LLC (+180K shares).
The largest position reductions in OABI for Q2 2026 were by Whitefort Capital Management, LP (-3.98Mn shares), Dimensional Fund Advisors LP (-483.15K shares), Citadel Advisors LLC (-170.49K shares), Vanguard Capital Management LLC (-141.3K shares) and UBS Group AG (-84.66K shares).
Business Quant data shows the 10 biggest positions in OmniAb as of Q2 2026 were held by Whitefort Capital Management, LP (10.25Mn shares), BlackRock, Inc. (8.9Mn shares), Nomura Holdings Inc (5.03Mn shares), Cadian Capital Management, LP (4.21Mn shares), Vanguard Capital Management LLC (3.85Mn shares), Geode Capital Management, LLC (2.88Mn shares), Rice Hall James & Associates, LLC (2.61Mn shares), Private Management Group Inc (2.34Mn shares), State Street Corp (2.13Mn shares) and Dimensional Fund Advisors LP (1.26Mn shares).

Form 13F Holdings

130 Institutional Holders

Report period 30 Jun, 2026

Total shares held 58.78Mn

Of outstanding 45.64%

#	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	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
20	RENAISSANCE TECHNOLOGIES LLC	0001037389	600,350	0.47%	▲330,750	+122.68%	$1.48Mn

Showing 1 to 20 of 130 holders