Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

OmniAb, Inc.

CIK 0001846253OABIOABIW· quarter ending 2026-06-30

Shares outstanding

145,390,398

as of 2026-07-30 · 10-Q cover page, filed 2026-08-06

Held by 13F filers

379

selection includes debt or preferreds — no % of shares outstanding

Holders

+1 vs 2026-03-31 · 1 new, 0 exited

Value

shares +176.6% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-06, as of 2026-07-30)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	OABI · NASDAQ	145,390,398	59,170,467	40.7%	131	68218J103

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
68218J103	COM	131	59,170,467	145,390,398	40.7%	$145.1M	2 call / 0 put	13DG	holders →
68218J111	*W EXP 99/99/999not common	13	2,836,627	—	—	$268K	1 call / 0 put	prefix	holders →
68218J202	RIGHTnot common	2	379	—	—	$0	—	NPORT	holders →
68218J301	RIGHTnot common	2	369	—	—	$0	—	NPORT	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (2 of 2 · 68218J202)

change vs 2026-03-31

#	Filer	Shares / principal	% of class	Value	Change
1	GAMMA Investing LLC	242	—	$0	NEW
2	State of Wyoming	137	—	$0	—

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
David Salanic	SCHEDULE 13G/A	2026-08-14	2026-06-30	10,248,658	7.1%
Joseph Kaplan	SCHEDULE 13G/A	2026-08-14	2026-06-30	10,248,658	7.1%
Whitefort Capital Management, LP	SCHEDULE 13G/A	2026-08-14	2026-06-30	10,248,658	7.1%
Ash X LP	SCHEDULE 13G/A	2026-02-10	2025-12-31	7,557,202	5.3%
Gotham Asset Management Holdings, LP	SCHEDULE 13G/A	2026-02-10	2025-12-31	1,195	0%
Gotham Asset Management, LLC	SCHEDULE 13G/A	2026-02-10	2025-12-31	1,195	0%
Gotham GP LLC	SCHEDULE 13G/A	2026-02-10	2025-12-31	1,195	0%
Joel Greenblatt	SCHEDULE 13G/A	2026-02-10	2025-12-31	1,429,766	1%
RLG Capco II LLC	SCHEDULE 13G/A	2026-02-10	2025-12-31	4,733,575	3.3%
RLG GP LLC	SCHEDULE 13G/A	2026-02-10	2025-12-31	7,557,202	5.3%
Robert Goldstein	SCHEDULE 13G/A	2026-02-10	2025-12-31	12,291,972	8.5%
JANUS HENDERSON GROUP PLC	SCHEDULE 13G/A	2025-08-14	2025-06-30	948,434	0.8%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.