OABI · OmniAb, Inc.

$3.92 +0.10 (+2.62%) At close · Aug 18

Market Cap

$31.27M

145.39M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Quarter:

Holders: 142

Total Value: $137,176,196

Total Shares: 61,784,940

Institutional Ownership Trend

16 quarters

Holder Concentration

Across 142 13F filers · Δ vs Mar 31, 2026

Top Holder

18.4%

−6.9 pts

Top 5

57.8%

−1.7 pts

Top 10

75.9%

−1.0 pts

HHI

874

Broadly held−195

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +2

Institutional value: +55.6%

Shares held: +4.9%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Large NOMURA HOLDINGS INC	+4,323,112	5,028,160
Mega BlackRock, Inc.	+790,609	8,897,490
Large RENAISSANCE TECHNOLOGIES LLC	+330,750	600,350
Mid ADAR1 Capital Management, LLC	+242,222	947,412
Small TOWERVIEW LLC	+180,000	1,180,000

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Small Whitefort Capital Management, LP	−3,975,000	10,248,658
Mega DIMENSIONAL FUND ADVISORS LP	−483,149	1,262,099
Mega CITADEL ADVISORS LLC	−149,394	91,890
Mega VANGUARD CAPITAL MANAGEMENT LLC	−141,296	3,852,356
Mega UBS Group AG	−84,658	37,586

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Large MACKENZIE FINANCIAL CORP	489,134	$1,203,269
Small Palumbo Wealth Management LLC	161,975	$398,458
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	159,621	$392,667
Large Walleye Capital LLC	144,427	$355,290
Large ACADIAN ASSET MANAGEMENT LLC	132,385	$325,667

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Small Stonepine Capital Management, LLC	164,045	$257,550
Large JACOBS LEVY EQUITY MANAGEMENT, INC	42,966	$67,456
Small NINE MASTS CAPITAL Ltd	29,062	$45,627
Small Legato Capital Management LLC	28,196	$44,267
Small State of Wyoming	24,694	$38,769

Filter: New 21 Increased 58 Reduced 33 Sold out 19 Unchanged 30

Showing 100 of 144

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Whitefort Capital Management, LP

$25,211,698

18.38%

10,248,658

BlackRock, Inc.

$21,887,825

15.96%

8,897,490

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	36,971	$90,948	0.4%	Sole
BlackRock Asset Management Canada Ltd	788	$1,938	0.0%	Sole
BlackRock Investment Management, LLC	308,828	$759,716	3.5%	Sole
BLACKROCK ADVISORS LLC	252,836	$621,976	2.8%	Sole
BlackRock Fund Advisors	5,181,299	$12,745,995	58.2%	Sole
BlackRock Institutional Trust Company, N.A.	2,924,146	$7,193,399	32.9%	Sole
BlackRock Japan Co. Ltd	36,032	$88,638	0.4%	Sole
BlackRock Asset Management Ireland Ltd	118,819	$292,294	1.3%	Sole
Aperio Group, LLC	37,771	$92,916	0.4%	Sole

NOMURA HOLDINGS INC

$12,369,273

9.02%

5,028,160

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NOMURA GLOBAL FINANCIAL PRODUCTS INC	5,028,160	$12,369,273	100.0%	Defined

CADIAN CAPITAL MANAGEMENT, LP

$10,361,079

7.55%

4,211,821

VANGUARD CAPITAL MANAGEMENT LLC

$9,476,795

6.91%

3,852,356

GEODE CAPITAL MANAGEMENT, LLC

$7,094,585

5.17%

2,883,978

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	433,075	$1,065,364	15.0%	Defined
Held directly	2,450,903	$6,029,221	85.0%	Defined

RICE HALL JAMES & ASSOCIATES, LLC

$6,421,667

4.68%

2,610,434

STATE STREET CORP

$5,248,530

3.83%

2,133,549

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS EUROPE LIMITED joint	2,133,549	$5,248,530	100.0%	Defined

DIMENSIONAL FUND ADVISORS LP

$3,104,763

2.26%

1,262,099

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	10,947	$26,929	0.9%	Defined
DFA Australia Ltd.	3,168	$7,793	0.3%	Defined
Dimensional Ireland Ltd	115,773	$284,801	9.2%	Defined
Held directly	1,132,211	$2,785,239	89.7%	Sole

TOWERVIEW LLC

$2,902,800

2.12%

1,180,000

VANGUARD PORTFOLIO MANAGEMENT LLC

$2,411,823

1.76%

980,416

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$2,378,517

1.73%

966,877

NORTHERN TRUST CORP

$2,332,803

1.70%

948,294

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	932,462	$2,293,856	98.3%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	15,832	$38,946	1.7%	Other

ADAR1 Capital Management, LLC

$2,330,633

1.70%

947,412

VANGUARD FIDUCIARY TRUST CO

$1,865,811

1.36%

758,460

TWO SIGMA INVESTMENTS, LP

$1,617,282

1.18%

657,432

Nuveen, LLC

$1,581,315

1.15%

642,811

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Nuveen Asset Management, LLC joint	1,827	$4,494	0.3%	Defined
TIAA CREF INVESTMENT MANAGEMENT LLC joint	437,156	$1,075,403	68.0%	Defined
TEACHERS ADVISORS, LLC joint	203,828	$501,416	31.7%	Defined

RENAISSANCE TECHNOLOGIES LLC

$1,476,861

1.08%

600,350

D. E. Shaw & Co., Inc.

$1,376,133

1.00%

559,404

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	512,549	$1,260,870	91.6%	Defined
D. E. Shaw Investment Management, L.L.C. joint	46,855	$115,263	8.4%	Defined

MACKENZIE FINANCIAL CORP

$1,203,269

0.88%

489,134

MILLENNIUM MANAGEMENT LLC

$1,166,431

0.85%

474,159

GOLDMAN SACHS GROUP INC

$946,049

0.69%

384,573

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	122,922	$302,388	32.0%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	261,651	$643,661	68.0%	Defined

MORGAN STANLEY

$913,904

0.67%

371,506

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	434	$1,067	0.1%	Defined
MORGAN STANLEY & CO. LLC	30,744	$75,630	8.3%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	39,198	$96,427	10.6%	Defined
MORGAN STANLEY SMITH BARNEY LLC	63,045	$155,090	17.0%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	238,083	$585,683	64.1%	Defined
EATON VANCE MANAGEMENT	2	$4	0.0%	Defined

Bank of New York Mellon Corp

$783,278

0.57%

318,406

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	142,742	$351,145	44.8%	Defined
The Bank of New York Mellon	175,663	$432,130	55.2%	Defined
Held directly	1	$2	0.0%	Defined

TLS Advisors LLC

$542,885

0.40%

220,685

FMR LLC

$491,552

0.36%

199,818

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	193,243	$475,377	96.7%	Defined
STRATEGIC ADVISERS LLC	6,575	$16,174	3.3%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$489,294

0.36%

198,900

Arbiter Partners Capital Management LLC

$473,759

0.35%

192,585

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Broken Clock Management LLC joint	192,585	$473,759	100.0%	Defined

RHUMBLINE ADVISERS

$423,014

0.31%

171,957

Palumbo Wealth Management LLC

$398,458

0.29%

161,975

Invesco Ltd.

$396,984

0.29%

161,376

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Advisers, Inc. joint	13,649	$33,575	8.5%	Defined
Invesco Trust Co joint	43,497	$107,002	27.0%	Defined
Invesco Capital Management LLC	104,230	$256,405	64.6%	Defined

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

$392,667

0.29%

159,621

AQR CAPITAL MANAGEMENT LLC

$387,981

0.28%

157,716

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RF&L WEALTH MANAGEMENT, LLC	29	$71	0.0%	Other
Compound Planning, Inc.	2	$4	0.0%	Other
Arax Advisory Partners	586	$1,441	0.4%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	717	$1,763	0.5%	Other
Stokes Family Office, LLC	205	$504	0.1%	Other
Held directly	156,177	$384,195	99.0%	Defined

ALLIANCEBERNSTEIN L.P.

$383,740

0.28%

155,992

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	155,992	$383,740	100.0%	Defined

BANK OF AMERICA CORP /DE/

$367,752

0.27%

149,493

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	149,493	$367,752	100.0%	Defined

Walleye Capital LLC

$355,290

0.26%

144,427

Cornerstone Capital, Inc.

$350,023

0.26%

142,286

ACADIAN ASSET MANAGEMENT LLC

$325,667

0.24%

132,385

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	132,385	$325,667	100.0%	Defined

JPMORGAN CHASE & CO

$263,340

0.19%

107,049

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	45,595	$112,163	42.6%	Defined
J.P. Morgan Investment Management Inc.	47,602	$117,100	44.5%	Defined
J.P. Morgan Securities LLC	2,953	$7,264	2.8%	Defined
J.P. Morgan Securities plc	10,899	$26,811	10.2%	Defined

DEUTSCHE BANK AG\

$248,071

0.18%

100,842

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS Investments UK Ltd	94,842	$233,311	94.1%	Defined
Held directly	6,000	$14,760	5.9%	Sole

WELLS FARGO & COMPANY/MN

$246,563

0.18%

100,229

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	92,109	$226,588	91.9%	Defined
WELLS FARGO CLEARING SERVICES, LLC	8,120	$19,975	8.1%	Defined

PRIVATE MANAGEMENT GROUP INC

$211,029

0.15%

2,344,770

PRICE T ROWE ASSOCIATES INC /MD/

$197,060

0.14%

80,106

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	79,925	$196,615	99.8%	Defined
Held directly	181	$445	0.2%	Sole

AMERICAN CENTURY COMPANIES INC

$184,704

0.13%

75,083

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	75,083	$184,704	100.0%	Defined

XTX Topco Ltd

$181,811

0.13%

73,907

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	73,907	$181,811	100.0%	Defined

Connor, Clark & Lunn Investment Management Ltd.

$177,998

0.13%

72,357

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	65,286	$160,603	90.2%	Sole
Held directly	7,071	$17,394	9.8%	Sole

MetLife Investment Management, LLC

$161,730

0.12%

65,744

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	65,744	$161,730	100.0%	Defined

Russell Investments Group, Ltd.

$156,906

0.11%

63,783

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	63,783	$156,905	100.0%	Defined

CITADEL ADVISORS LLC

$143,147

0.10%

58,190

Thrivent Financial for Lutherans

$136,141

0.10%

55,342

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Thrivent Asset Management, LLC	21,477	$52,833	38.8%	Defined
Held directly	33,865	$83,307	61.2%	Sole

CITIGROUP INC

$134,480

0.10%

54,667

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	54,667	$134,480	100.0%	Defined

SEI INVESTMENTS CO

$131,339

0.10%

53,390

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SEI INVESTMENTS MANAGEMENT CORP	51,563	$126,844	96.6%	Sole
SEI TRUST CO	1,827	$4,494	3.4%	Sole

Shay Capital LLC

$126,690

0.09%

51,500

Vanguard Global Advisers, LLC

$126,434

0.09%

51,396

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$124,584

0.09%

50,644

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	50,644	$124,584	100.0%	Defined

BLAIR WILLIAM & CO/IL

$106,749

0.08%

43,394

PRUDENTIAL FINANCIAL INC

$95,863

0.07%

38,969

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PGIM Quantitative Solutions LLC	38,969	$95,863	100.0%	Defined

UBS Group AG

$92,461

0.07%

37,586

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	3,455	$8,499	9.2%	Defined
UBS AG	14,154	$34,818	37.7%	Defined
UBS Securities LLC	19,977	$49,143	53.1%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$87,799

0.06%

35,691

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	35,691	$87,799	100.0%	Other

Squarepoint Ops LLC

$86,978

0.06%

35,357

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	35,357	$86,978	100.0%	Defined

LPL Financial LLC

$85,659

0.06%

34,821

CITADEL ADVISORS LLC

$82,902

0.06%

33,700

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	33,700	$82,902	100.0%	Defined

LMR Partners LLP

$79,599

0.06%

897,392

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
LMR PARTNERS (DIFC) Ltd	897,392	$79,599	100.0%	Sole

ISTHMUS PARTNERS, LLC

$72,308

0.05%

803,428

INTECH INVESTMENT MANAGEMENT LLC

$68,447

0.05%

27,824

BARCLAYS PLC

$65,113

0.05%

26,469

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	24,264	$59,689	91.7%	Defined
BARCLAYS CAPITAL INC.	2,205	$5,424	8.3%	Defined

MANUFACTURERS LIFE INSURANCE COMPANY, THE

$60,971

0.04%

24,785

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MANULIFE FINANCIAL CORP joint	24,785	$60,971	100.0%	Defined

VOYA INVESTMENT MANAGEMENT LLC

$58,087

0.04%

23,613

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Voya Investment Management Co. LLC joint	23,613	$58,087	100.0%	Defined

ARISTEIA CAPITAL, L.L.C.

$53,544

0.04%

679,919

HighTower Advisors, LLC

$53,158

0.04%

21,609

Qube Research & Technologies Ltd

$49,657

0.04%

20,186

BNP PARIBAS ARBITRAGE, SA

$48,762

0.04%

19,822

Quadrature Capital Ltd

$47,950

0.03%

19,492

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Quadrature US Inc.	19,492	$47,950	100.0%	Other

ProShare Advisors LLC

$47,121

0.03%

19,155

Hudson Bay Capital Management LP

$41,266

0.03%

465,229

TWO SIGMA SECURITIES, LLC

$38,685

0.03%

15,726

OSAIC HOLDINGS, INC.

$38,029

0.03%

15,459

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	15,459	$38,029	100.0%	Defined

CANADA PENSION PLAN INVESTMENT BOARD

$37,146

0.03%

15,100

VICTORY CAPITAL MANAGEMENT INC

$33,576

0.02%

13,649

JANE STREET GROUP, LLC

$32,472

0.02%

13,200

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	13,200	$32,472	100.0%	Defined

MERCER GLOBAL ADVISORS INC /ADV

$30,398

0.02%

12,357

CHOREO, LLC

$30,090

0.02%

12,232

Anson Funds Management LP

$29,109

0.02%

11,833

Legal & General Group Plc

$27,758

0.02%

11,284

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	11,284	$27,758	100.0%	Defined

Vanguard Personalized Indexing Management, LLC

$26,550

0.02%

10,793

Virtu Financial LLC

$25,989

0.02%

10,565

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	10,565	$25,989	100.0%	Defined

XPONANCE LLC

$25,761

0.02%

10,472

Ameritas Investment Partners, Inc.

$23,743

0.02%

9,652

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
EATON VANCE MANAGEMENT	9,652	$23,743	100.0%	Other

Sculptor Capital LP

$23,137

0.02%

293,802

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Sculptor Capital II LP joint	293,802	$23,137	100.0%	Sole

Tower Research Capital LLC (TRC)

$19,788

0.01%

8,044

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	8,044	$19,788	100.0%	Defined

SUMMIT SECURITIES GROUP LLC

$19,389

0.01%

7,882

Calamos Advisors LLC

$18,000

0.01%

200,000

Integrated Wealth Concepts LLC

$14,046

0.01%

5,710

MMCAP International Inc. SPC

$14,044

0.01%

158,333

ROYAL BANK OF CANADA

$12,838

0.01%

5,219

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	3,303	$8,125	63.3%	Defined
RBC Capital Markets, LLC	1,915	$4,710	36.7%	Defined
Held directly	1	$2	0.0%	Sole

MILLENNIUM MANAGEMENT LLC

$10,926

0.01%

123,181

GF FUND MANAGEMENT CO. LTD.

$7,313

0.01%

2,973

Allworth Financial LP

$6,816

0.00%

2,771

Redwood Park Advisors LLC

$5,372

0.00%

2,184

CSS LLC/IL

$4,848

0.00%

54,656

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Capital	42,217	$3,799	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Wolverine Holdings, LLC	27,626	$2,450	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Optiver VOF	848	$2,086	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TORONTO DOMINION BANK	170	$418	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fifth Third Bank, National Association	127	$312	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Group AG	127	$312	100.0%	Defined

Key facts CIK 1846253 CUSIP 68218J111 13F (30d) 138 filings 137 filers Visit website Investor relations