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Equibles

OABIW

OmniAb, Inc.

Company with tickers: OABI, OABIW

Market Cap
$372.58M
Shares Outstanding
144,972,579
CIK
1846253
CUSIP
68218J103
Investor Relations
Investor relations

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.

Holders: 128
Total Value: $86,443,470
Total Shares: 55,059,587
Showing 1–100 of 129 holdings by value · page 1 of 2

Institutional Ownership Trend

18 quarters

Holder Concentration

Across 128 13F filers · Δ vs Dec 31, 2025
Top Holder
25.8%
Mar 2024 → Mar 2026 · range 12.5% – 25.8%
+1.0 pts
Top 5
60.7%
Mar 2024 → Mar 2026 · range 43.2% – 61.2%
−0.5 pts
Top 10
78.5%
Mar 2024 → Mar 2026 · range 63.8% – 78.7%
−0.2 pts
HHI
1,109
Mar 2024 → Mar 2026 · range 547 – 1,109
Broadly held+34

Quarterly Activity

vs Dec 31, 2025
New
24
Increased
42
Decreased
38
Sold Out
26
Unchanged
24
Holder count: -2
Institutional value: -32.9%
Shares held: -20.9%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Large NOMURA HOLDINGS INC +550,097 705,048
Mega GEODE CAPITAL MANAGEMENT, LLC +202,887 2,925,579
Micro TLS Advisors LLC +180,185 250,185
Mid RICE HALL JAMES & ASSOCIATES, LLC +146,167 2,547,255
Mega AQR CAPITAL MANAGEMENT LLC +91,494 115,647

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Small Stonepine Capital Management, LLC −536,955 164,045
Mega DIMENSIONAL FUND ADVISORS LP −407,345 1,745,248
Small CADIAN CAPITAL MANAGEMENT, LP −277,825 4,157,129
Mega Nuveen, LLC −250,636 623,876
Large JACOBS LEVY EQUITY MANAGEMENT, INC −195,223 42,966

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 3,993,652 $6,270,033
Mega VANGUARD FIDUCIARY TRUST CO 725,608 $1,139,204
Mega Vanguard Global Advisers, LLC 51,396 $80,691
Mid Shay Capital LLC 49,662 $77,969
Mega AMERICAN CENTURY COMPANIES INC 34,816 $54,661

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
— Robert Goldstein 12,291,972 $22,740,148
Mega VANGUARD GROUP INC 5,625,197 $10,406,613
Large Woodline Partners LP 285,714 $528,570
Large TWO SIGMA ADVISERS, LP 197,530 $365,430
Small CONNORS INVESTOR SERVICES INC 61,941 $114,590
Filter: New 24 Increased 42 Reduced 38 Sold out 26 Unchanged 24
Showing 100 of 129
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Small Whitefort Capital Management, LP $22,331,143 25.83% 14,223,658
Mega BlackRock, Inc. $12,727,799 14.72% 8,106,881
Small CADIAN CAPITAL MANAGEMENT, LP $6,526,692 7.55% 4,157,129
Mega VANGUARD CAPITAL MANAGEMENT LLC $6,270,033 7.25% 3,993,652
Mega GEODE CAPITAL MANAGEMENT, LLC $4,593,158 5.31% 2,925,579
Mid RICE HALL JAMES & ASSOCIATES, LLC $3,999,190 4.63% 2,547,255
Mid PRIVATE MANAGEMENT GROUP INC $3,813,790 4.41% 2,429,166
Mega STATE STREET CORP $3,245,414 3.75% 2,067,143
Mega DIMENSIONAL FUND ADVISORS LP $2,740,037 3.17% 1,745,248
Small TOWERVIEW LLC $1,570,000 1.82% 1,000,000
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $1,506,529 1.74% 959,573
Mega NORTHERN TRUST CORP Bank $1,383,004 1.60% 880,895
Small ISTHMUS PARTNERS, LLC $1,187,978 1.37% 756,674
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,139,204 1.32% 725,608
Mid ADAR1 Capital Management, LLC $1,107,148 1.28% 705,190
Large NOMURA HOLDINGS INC $1,106,925 1.28% 705,048
Mega Nuveen, LLC $979,484 1.13% 623,876
Mega MILLENNIUM MANAGEMENT LLC $822,551 0.95% 523,918
Mega TWO SIGMA INVESTMENTS, LP $805,003 0.93% 512,741
Mega GOLDMAN SACHS GROUP INC $657,867 0.76% 419,024
Mega MORGAN STANLEY $640,452 0.74% 407,933
Mega D. E. Shaw & Co., Inc. $596,998 0.69% 380,254
Mega Bank of New York Mellon Corp Bank $430,887 0.50% 274,451
Large RENAISSANCE TECHNOLOGIES LLC $423,272 0.49% 269,600
Micro TLS Advisors LLC $392,790 0.45% 250,185
Mega CITADEL ADVISORS LLC $359,033 0.42% 228,684
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $312,273 0.36% 198,900
Small Arbiter Partners Capital Management LLC $302,358 0.35% 192,585
Mega FMR LLC $297,571 0.34% 189,536
Small Stonepine Capital Management, LLC $257,550 0.30% 164,045
Mega RHUMBLINE ADVISERS $249,998 0.29% 159,235
Mega ALLIANCEBERNSTEIN L.P. $236,429 0.27% 150,592
Small Cornerstone Capital, Inc. $223,389 0.26% 142,286
Mega Invesco Ltd. $212,085 0.25% 135,087
Mega BANK OF AMERICA CORP /DE/ Bank $190,999 0.22% 121,656
Mega JPMORGAN CHASE & CO $188,558 0.22% 120,102
Mega AQR CAPITAL MANAGEMENT LLC $181,561 0.21% 115,647
Mega UBS Group AG $160,935 0.19% 102,507
Mega DEUTSCHE BANK AG\ Bank $145,491 0.17% 92,670
Mega PRICE T ROWE ASSOCIATES INC /MD/ $120,952 0.14% 77,040
Large SEI INVESTMENTS CO $95,107 0.11% 60,578
Mega Vanguard Global Advisers, LLC $80,691 0.09% 51,396
Mega WELLS FARGO & COMPANY/MN $78,708 0.09% 50,133
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $78,677 0.09% 50,113
Mid Shay Capital LLC $77,969 0.09% 49,662
Large MetLife Investment Management, LLC $75,567 0.09% 48,132
Mid XTX Topco Ltd $70,114 0.08% 44,659
Large BLAIR WILLIAM & CO/IL $67,849 0.08% 43,216
Large JACOBS LEVY EQUITY MANAGEMENT, INC $67,456 0.08% 42,966
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $65,357 0.08% 41,629
Mega LPL Financial LLC $56,777 0.07% 36,164
Mid Tower Research Capital LLC (TRC) $55,430 0.06% 35,306
Mega AMERICAN CENTURY COMPANIES INC $54,661 0.06% 34,816
Mid WOODSTOCK CORP $54,036 0.06% 34,418
Mid NINE MASTS CAPITAL Ltd $45,627 0.05% 29,062
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $45,440 0.05% 28,943
Mid INTECH INVESTMENT MANAGEMENT LLC $45,431 0.05% 28,937
Mega BARCLAYS PLC $45,152 0.05% 28,760
Mid Legato Capital Management LLC $44,267 0.05% 28,196
Mega JANE STREET GROUP, LLC $43,254 0.05% 27,551
Mega BNP PARIBAS ARBITRAGE, SA $42,922 0.05% 27,339
Mid China Universal Asset Management Co., Ltd. $40,107 0.05% 25,546
Mid Vanguard Personalized Indexing Management, LLC $39,606 0.05% 25,227
Small State of Wyoming $38,769 0.04% 24,694
Large Police & Firemen's Retirement System of New Jersey Pension $35,431 0.04% 22,568
Large ProShare Advisors LLC $35,406 0.04% 22,552
Large HighTower Advisors, LLC $33,076 0.04% 21,068
Small BFSG, LLC $32,679 0.04% 20,815
Large PRUDENTIAL FINANCIAL INC $30,268 0.04% 19,279
Large VOYA INVESTMENT MANAGEMENT LLC $28,558 0.03% 18,190
Small Thrive Wealth Management, LLC $27,131 0.03% 17,281
Large Point72 Asset Management, L.P. $25,493 0.03% 16,238
Large Connor, Clark & Lunn Investment Management Ltd. $22,193 0.03% 14,136
Mega VICTORY CAPITAL MANAGEMENT INC $21,176 0.02% 13,488
Mega CITADEL ADVISORS LLC $19,782 0.02% 12,600
Mid CHOREO, LLC $19,119 0.02% 12,178
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $18,535 0.02% 11,806
Small Diversified Enterprises, LLC $17,758 0.02% 11,311
Large Russell Investments Group, Ltd. $16,955 0.02% 10,800
Small Abel Hall, LLC $16,805 0.02% 10,704
Mid Integrated Wealth Concepts LLC $16,722 0.02% 10,651
Large MERCER GLOBAL ADVISORS INC /ADV $15,775 0.02% 10,048
Large Squarepoint Ops LLC $15,750 0.02% 10,032
Mega CITIGROUP INC $15,309 0.02% 9,752
Mid Ameritas Investment Partners, Inc. $15,153 0.02% 9,652
Mega Legal & General Group Plc $14,588 0.02% 9,292
Large Mirae Asset Global Investments Co., Ltd. $12,291 0.01% 7,829
Small Steigerwald, Gordon & Koch Inc. $12,046 0.01% 7,673
Large CWM, LLC $11,930 0.01% 7,599
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $9,801 0.01% 6,243
Large OSAIC HOLDINGS, INC. $8,633 0.01% 5,499
Mid MAI Capital Management $7,568 0.01% 4,821
Mid Sterling Capital Management LLC $5,191 0.01% 3,307
Mid GF FUND MANAGEMENT CO. LTD. $5,025 0.01% 3,201
Mid Allworth Financial LP $3,848 0.00% 2,451
Small Jackson, Grant Investment Advisers, Inc. $3,846 0.00% 2,450
Micro Redwood Park Advisors LLC $3,428 0.00% 2,184
Mid Parallel Advisors, LLC $2,910 0.00% 1,854
Mega ROYAL BANK OF CANADA Bank $2,748 0.00% 1,751
Mid Larson Financial Group LLC $2,267 0.00% 1,444

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