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

59,170,467

40.7% of shares outstanding

Holders

131

+3 vs 2026-03-31 · 21 new, 18 exited

Value

$145.1M

shares +5.8% 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 (131 of 131 · 68218J103)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	Whitefort Capital Management, LP	10,248,658	7.05%	$25.2M	-3,975,000 (-27.9%)
2	BlackRock, Inc.	8,897,490	6.12%	$21.9M	+790,609 (+9.8%)
3	NOMURA HOLDINGS INC	5,028,160	3.46%	$12.4M	+4,323,112 (+613.2%)
4	CADIAN CAPITAL MANAGEMENT, LP	4,211,821	2.90%	$10.4M	+54,692 (+1.3%)
5	VANGUARD CAPITAL MANAGEMENT LLC	3,852,356	2.65%	$9.5M	-141,296 (-3.5%)
6	GEODE CAPITAL MANAGEMENT, LLC	2,883,978	1.98%	$7.1M	-41,601 (-1.4%)
7	RICE HALL JAMES & ASSOCIATES, LLC	2,610,434	1.80%	$6.4M	+63,179 (+2.5%)
8	PRIVATE MANAGEMENT GROUP INC	2,344,770	1.61%	$5.8M	-84,396 (-3.5%)
9	STATE STREET CORP	2,133,549	1.47%	$5.2M	+66,406 (+3.2%)
10	DIMENSIONAL FUND ADVISORS LP	1,262,099	0.87%	$3.1M	-483,149 (-27.7%)
11	TOWERVIEW LLC	1,180,000	0.81%	$2.9M	+180,000 (+18.0%)
12	VANGUARD PORTFOLIO MANAGEMENT LLC	980,416	0.67%	$2.4M	+76,617 (+8.5%)
13	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	966,877	0.67%	$2.4M	+7,304 (+0.8%)
14	NORTHERN TRUST CORP	948,294	0.65%	$2.3M	+67,399 (+7.7%)
15	ADAR1 Capital Management, LLC	947,412	0.65%	$2.3M	+242,222 (+34.3%)
16	ISTHMUS PARTNERS, LLC	803,428	0.55%	$2.0M	+46,754 (+6.2%)
17	VANGUARD FIDUCIARY TRUST CO	758,460	0.52%	$1.9M	+32,852 (+4.5%)
18	TWO SIGMA INVESTMENTS, LP	657,432	0.45%	$1.6M	+144,691 (+28.2%)
19	Nuveen, LLC	642,811	0.44%	$1.6M	+18,935 (+3.0%)
20	RENAISSANCE TECHNOLOGIES LLC	600,350	0.41%	$1.5M	+330,750 (+122.7%)
21	Arbiter Partners Capital Management LLC	577,755	0.40%	$1.4M	+385,170 (+200.0%)
22	D. E. Shaw & Co., Inc.	559,404	0.38%	$1.4M	+179,150 (+47.1%)
23	MACKENZIE FINANCIAL CORP	489,134	0.34%	$1.2M	NEW
24	MILLENNIUM MANAGEMENT LLC	474,159	0.33%	$864K	-49,759 (-9.5%)
25	GOLDMAN SACHS GROUP INC	384,573	0.26%	$946K	-34,451 (-8.2%)
26	MORGAN STANLEY	371,506	0.26%	$914K	-36,427 (-8.9%)
27	Bank of New York Mellon Corp	318,406	0.22%	$783K	+43,955 (+16.0%)
28	TLS Advisors LLC	220,685	0.15%	$543K	-29,500 (-11.8%)
29	FMR LLC	199,818	0.14%	$492K	+10,282 (+5.4%)
30	BRIDGEWAY CAPITAL MANAGEMENT, LLC	198,900	0.14%	$489K	—
31	RHUMBLINE ADVISERS	171,957	0.12%	$423K	+12,722 (+8.0%)
32	Palumbo Wealth Management LLC	161,975	0.11%	$398K	NEW
33	Invesco Ltd.	161,376	0.11%	$397K	+26,289 (+19.5%)
34	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	159,621	0.11%	$393K	NEW
35	AQR CAPITAL MANAGEMENT LLC	157,716	0.11%	$388K	+42,069 (+36.4%)
36	ALLIANCEBERNSTEIN L.P.	155,992	0.11%	$245K	+5,400 (+3.6%)
37	BANK OF AMERICA CORP /DE/	149,493	0.10%	$368K	+27,837 (+22.9%)
38	Walleye Capital LLC	144,427	0.10%	$355K	NEW
39	Cornerstone Capital, Inc.	142,286	0.10%	$350K	—
40	ACADIAN ASSET MANAGEMENT LLC	132,385	0.09%	$323K	NEW
41	JPMORGAN CHASE & CO	107,049	0.07%	$275K	-13,053 (-10.9%)
42	DEUTSCHE BANK AG\	100,842	0.07%	$248K	+8,172 (+8.8%)
43	WELLS FARGO & COMPANY/MN	100,229	0.07%	$247K	+50,096 (+99.9%)
44	PRICE T ROWE ASSOCIATES INC /MD/	80,106	0.06%	$198K	+3,066 (+4.0%)
45	AMERICAN CENTURY COMPANIES INC	75,083	0.05%	$185K	+40,267 (+115.7%)
46	XTX Topco Ltd	73,907	0.05%	$182K	+29,248 (+65.5%)
47	Connor, Clark & Lunn Investment Management Ltd.	72,357	0.05%	$178K	+58,221 (+411.9%)
48	MetLife Investment Management, LLC	65,744	0.05%	$162K	+17,612 (+36.6%)
49	Russell Investments Group, Ltd.	63,783	0.04%	$157K	+52,983 (+490.6%)
50	CITADEL ADVISORS LLC	58,190	0.04%	$143K	-170,494 (-74.6%)
51	Thrivent Financial for Lutherans	55,342	0.04%	$136K	NEW
52	CITIGROUP INC	54,667	0.04%	$134K	+44,915 (+460.6%)
53	SEI INVESTMENTS CO	53,390	0.04%	$131K	-7,188 (-11.9%)
54	Shay Capital LLC	51,500	0.04%	$127K	+1,838 (+3.7%)
55	Vanguard Global Advisers, LLC	51,396	0.04%	$126K	—
56	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	50,644	0.03%	$125K	+531 (+1.1%)
57	BLAIR WILLIAM & CO/IL	43,394	0.03%	$107K	+178 (+0.4%)
58	Police & Firemen's Retirement System of New Jersey	42,217	0.03%	$104K	+19,649 (+87.1%)
59	PRUDENTIAL FINANCIAL INC	38,969	0.03%	$96K	+19,690 (+102.1%)
60	SUSQUEHANNA INTERNATIONAL GROUP, LLP	35,691	0.02%	$88K	-5,938 (-14.3%)
61	Squarepoint Ops LLC	35,357	0.02%	$87K	+25,325 (+252.4%)
62	LPL Financial LLC	34,821	0.02%	$86K	-1,343 (-3.7%)
63	WOODSTOCK CORP	29,376	0.02%	$72K	-5,042 (-14.6%)
64	INTECH INVESTMENT MANAGEMENT LLC	27,824	0.02%	$68K	-1,113 (-3.8%)
65	BARCLAYS PLC	26,469	0.02%	$65K	-2,291 (-8.0%)
66	MANUFACTURERS LIFE INSURANCE COMPANY, THE	24,785	0.02%	$61K	-4,158 (-14.4%)
67	VOYA INVESTMENT MANAGEMENT LLC	23,613	0.02%	$58K	+5,423 (+29.8%)
68	China Universal Asset Management Co., Ltd.	23,072	0.02%	$57K	-2,474 (-9.7%)
69	HighTower Advisors, LLC	21,609	0.01%	$53K	+541 (+2.6%)
70	BFSG, LLC	20,815	0.01%	$51K	—
71	Qube Research & Technologies Ltd	20,186	0.01%	$50K	NEW
72	BNP PARIBAS FINANCIAL MARKETS	19,822	0.01%	$49K	-7,517 (-27.5%)
73	Quadrature Capital Ltd	19,492	0.01%	$48K	NEW
74	ProShare Advisors LLC	19,155	0.01%	$47K	-3,397 (-15.1%)
75	Thrive Wealth Management, LLC	18,046	0.01%	$44K	+765 (+4.4%)
76	UBS Group AG	17,849	0.01%	$44K	-84,658 (-82.6%)
77	TWO SIGMA SECURITIES, LLC	15,726	0.01%	$39K	NEW
78	OSAIC HOLDINGS, INC.	15,459	0.01%	$38K	+9,960 (+181.1%)
79	CANADA PENSION PLAN INVESTMENT BOARD	15,100	0.01%	$37K	NEW
80	VICTORY CAPITAL MANAGEMENT INC	13,649	0.01%	$34K	+161 (+1.2%)
81	MERCER GLOBAL ADVISORS INC /ADV	12,357	0.01%	$30K	+2,309 (+23.0%)
82	CHOREO, LLC	12,232	0.01%	$30K	+54 (+0.4%)
83	NEW YORK STATE COMMON RETIREMENT FUND	11,806	0.01%	$29K	—
84	Legal & General Group Plc	11,284	0.01%	$28K	+1,992 (+21.4%)
85	Legato Capital Management LLC	10,913	0.01%	$27K	-17,283 (-61.3%)
86	Vanguard Personalized Indexing Management, LLC	10,793	0.01%	$27K	-14,434 (-57.2%)
87	Virtu Financial LLC	10,565	0.01%	$26K	NEW
88	XPONANCE LLC	10,472	0.01%	$26K	NEW
89	Ameritas Investment Partners, Inc.	9,652	0.01%	$24K	—
90	Tower Research Capital LLC (TRC)	8,044	0.01%	$20K	-27,262 (-77.2%)
91	SUMMIT SECURITIES GROUP LLC	7,882	0.01%	$19K	NEW
92	Steigerwald, Gordon & Koch Inc.	7,673	0.01%	$19K	—
93	Mirae Asset Global Investments Co., Ltd.	6,484	0.00%	$16K	-1,345 (-17.2%)
94	ROYAL BANK OF CANADA	5,219	0.00%	$13K	+3,468 (+198.1%)
95	GF FUND MANAGEMENT CO. LTD.	2,973	0.00%	$7K	-228 (-7.1%)
96	Allworth Financial LP	2,771	0.00%	$7K	+320 (+13.1%)
97	Jackson, Grant Investment Advisers, Inc.	2,450	0.00%	$6K	—
98	Sterling Capital Management LLC	2,217	0.00%	$5K	-1,090 (-33.0%)
99	Redwood Park Advisors LLC	2,184	0.00%	$5K	—
100	SBI Securities Co., Ltd.	2,059	0.00%	$5K	+2,035 (+8479.2%)
101	Parallel Advisors, LLC	1,854	0.00%	$5K	—
102	Arax Advisory Partners	1,601	0.00%	$4K	+1,593 (+19912.5%)
103	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	1,515	0.00%	$4K	-4,728 (-75.7%)
104	Larson Financial Group LLC	1,444	0.00%	$4K	—
105	Cheviot Value Management, LLC	980	0.00%	$2K	—
106	Optiver Holding B.V.	848	0.00%	$2K	-96 (-10.2%)
107	North Star Investment Management Corp.	550	0.00%	$1K	—
108	EverSource Wealth Advisors, LLC	521	0.00%	$1K	+11 (+2.2%)
109	NISA INVESTMENT ADVISORS, LLC	520	0.00%	$1K	+30 (+6.1%)
110	Dynamic Wealth Strategies, LLC	411	0.00%	$1K	—
111	SIGNATUREFD, LLC	361	0.00%	$888	—
112	Parkside Financial Bank & Trust	347	0.00%	$854	NEW
113	Comprehensive Financial Planning, Inc./PA	323	0.00%	$795	—
114	Quarry LP	317	0.00%	$780	NEW
115	C M BIDWELL & ASSOCIATES LTD	233	0.00%	$573	NEW
116	Farther Finance Advisors, LLC	191	0.00%	$479	+160 (+516.1%)
117	IFG Advisory, LLC	190	0.00%	$468	NEW
118	CENTRAL TRUST Co	171	0.00%	$421	—
119	TD PRIVATE CLIENT WEALTH LLC	170	0.00%	$418	NEW
120	ROTHSCHILD INVESTMENT LLC	154	0.00%	$379	+66 (+75.0%)
121	GAMMA Investing LLC	128	0.00%	$315	-804 (-86.3%)
122	FIFTH THIRD BANCORP	127	0.00%	$312	—
123	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	127	0.00%	$312	—
124	IFP Advisors, Inc	87	0.00%	$214	-8 (-8.4%)
125	True Wealth Design, LLC	54	0.00%	$133	+38 (+237.5%)
126	Wealth Enhancement Trust Services, Inc.	35	0.00%	$86	NEW
127	Clearstead Advisors, LLC	29	0.00%	$72	NEW
128	SJS Investment Consulting Inc.	28	0.00%	$69	+25 (+833.3%)
129	MATHER GROUP, LLC.	21	0.00%	$52	—
130	JPL Wealth Management, LLC	7	0.00%	$18	NEW
131	Caitong International Asset Management Co., Ltd	5	0.00%	$12	+4 (+400.0%)

Exited since 2026-03-31 (18 filers; largest 18 shown)

Stonepine Capital Management, LLC	−164,045
JACOBS LEVY EQUITY MANAGEMENT, INC	−42,966
NINE MASTS CAPITAL Ltd	−29,062
JANE STREET GROUP, LLC	−27,551
State of Wyoming	−24,694
Point72 Asset Management, L.P.	−16,238
Diversified Enterprises, LLC	−11,311
Abel Hall, LLC	−10,704
Integrated Wealth Concepts LLC	−10,651
CWM, LLC	−7,599
MAI Capital Management	−4,821
Essential Partners LLC	−1,060
SIMPLEX TRADING, LLC	−283
TWIN PEAKS WEALTH ADVISORS, LLC	−58
FARMERS & MERCHANTS INVESTMENTS INC	−53
Transamerica Financial Advisors, LLC	−29
Wealth Preservation Advisors, LLC	−19
Root Financial Partners, LLC	−13

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.