OmniAb, Inc. (OABI) — Institutional Holders, Q2 2026
145 institutional investment managers reported a OABI position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $144.5M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
OABI in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- NOMURAAdded · +4,323,112 sh+$10.6M
- BlackRockAdded · +790,609 sh+$1.9M
- MACKENZIE FINANCIALNew · +489,134 sh+$1.2M
- RENAISSANCE TECHNOLOGIESAdded · +330,750 sh+$813.6K
- ADAR1 Capital ManagementAdded · +242,222 sh+$595.9K
Biggest sellers
- Whitefort Capital ManagementTrimmed · -3,975,000 sh-$9.8M
- DIMENSIONAL FUND ADVISORSTrimmed · -483,149 sh-$1.2M
- CITADEL ADVISORSTrimmed · -170,494 sh-$419.4K
- Stonepine Capital ManagementSold out · -164,045 sh-$403.6K
- VANGUARD CAPITAL MANAGEMENTTrimmed · -141,296 sh-$347.6K
OABI 13F holders ranked 1–100 of 145
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | Whitefort Capital Management#1 · 10,248,658 sh | 10,248,658 | $25.2M | 6.21% | -27.9% |
| 2 | BlackRock#2 · 8,897,490 sh | 8,897,490 | $21.9M | <0.01% | +9.8% |
| 3 | NOMURA#3 · 5,028,160 sh | 5,028,160 | $12.4M | 0.01% | +613.2% |
| 4 | CADIAN CAPITAL MANAGEMENT#4 · 4,211,821 sh | 4,211,821 | $10.4M | 0.78% | +1.3% |
| 5 | VANGUARD CAPITAL MANAGEMENT#5 · 3,852,356 sh | 3,852,356 | $9.5M | <0.01% | -3.5% |
| 6 | GEODE CAPITAL MANAGEMENT#6 · 2,883,978 sh | 2,883,978 | $7.1M | <0.01% | -1.4% |
| 7 | RICE HALL JAMES & ASSOCIATES#7 · 2,610,434 sh | 2,610,434 | $6.4M | 0.31% | +2.5% |
| 8 | PRIVATE MANAGEMENT GROUP#8 · 2,344,770 sh | 2,344,770 | $5.8M | 0.15% | -3.5% |
| 9 | STATE STREET#9 · 2,133,549 sh | 2,133,549 | $5.2M | <0.01% | +3.2% |
| 10 | DIMENSIONAL FUND ADVISORS#10 · 1,262,099 sh | 1,262,099 | $3.1M | <0.01% | -27.7% |
| 11 | TOWERVIEW#11 · 1,180,000 sh | 1,180,000 | $2.9M | 1.90% | +18.0% |
| 12 | VANGUARD PORTFOLIO MANAGEMENT#12 · 980,416 sh | 980,416 | $2.4M | <0.01% | +8.5% |
| 13 | CHARLES SCHWAB INVESTMENT MANAGEMENT#13 · 966,877 sh | 966,877 | $2.4M | <0.01% | +0.8% |
| 14 | NORTHERN#14 · 948,294 sh | 948,294 | $2.3M | <0.01% | +7.7% |
| 15 | ADAR1 Capital Management#15 · 947,412 sh | 947,412 | $2.3M | 0.11% | +34.3% |
| 16 | ISTHMUS PARTNERS#16 · 803,428 sh | 803,428 | $2.0M | — | +6.2% |
| 17 | VANGUARD FIDUCIARY#17 · 758,460 sh | 758,460 | $1.9M | <0.01% | +4.5% |
| 18 | TWO SIGMA INVESTMENTS#18 · 657,432 sh | 657,432 | $1.6M | <0.01% | +28.2% |
| 19 | Nuveen#19 · 642,811 sh | 642,811 | $1.6M | <0.01% | +3.0% |
| 20 | RENAISSANCE TECHNOLOGIES#20 · 600,350 sh | 600,350 | $1.5M | <0.01% | +122.7% |
| 21 | D. E. Shaw#21 · 559,404 sh | 559,404 | $1.4M | <0.01% | +47.1% |
| 22 | MACKENZIE FINANCIAL#22 · 489,134 sh | 489,134 | $1.2M | <0.01% | New |
| 23 | GOLDMAN SACHS GROUP#23 · 384,573 sh | 384,573 | $946.0K | <0.01% | -8.2% |
| 24 | MORGAN STANLEY#24 · 371,506 sh | 371,506 | $913.9K | 0.00% | -8.9% |
| 25 | MILLENNIUM MANAGEMENT#25 · 474,159 sh | 474,159 | $864.3K | <0.01% | -9.5% |
| 26 | Bank of New York Mellon#26 · 318,406 sh | 318,406 | $783.3K | <0.01% | +16.0% |
| 27 | TLS Advisors#27 · 220,685 sh | 220,685 | $542.9K | 1.60% | -11.8% |
| 28 | FMR#28 · 199,818 sh | 199,818 | $491.6K | 0.00% | +5.4% |
| 29 | BRIDGEWAY CAPITAL MANAGEMENT#29 · 198,900 sh | 198,900 | $489.3K | <0.01% | 0.0% |
| 30 | Arbiter Partners Capital Management#30 · 192,585 sh | 192,585 | $473.8K | 0.25% | 0.0% |
| 31 | RHUMBLINE ADVISERS#31 · 171,957 sh | 171,957 | $423.0K | <0.01% | +8.0% |
| 32 | Palumbo Wealth Management#32 · 161,975 sh | 161,975 | $398.5K | 0.08% | New |
| 33 | Invesco Ltd.#33 · 161,376 sh | 161,376 | $397.0K | 0.00% | +19.5% |
| 34 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP#34 · 159,621 sh | 159,621 | $392.7K | <0.01% | New |
| 35 | AQR CAPITAL MANAGEMENT#35 · 157,716 sh | 157,716 | $388.0K | <0.01% | +36.4% |
| 36 | BANK OF AMERICA#36 · 149,493 sh | 149,493 | $367.8K | 0.00% | +22.9% |
| 37 | Walleye Capital#37 · 144,427 sh | 144,427 | $355.3K | <0.01% | New |
| 38 | Cornerstone Capital#38 · 142,286 sh | 142,286 | $350.0K | 0.03% | 0.0% |
| 39 | ACADIAN ASSET MANAGEMENT#39 · 132,385 sh | 132,385 | $323.0K | <0.01% | New |
| 40 | JPMORGAN CHASE#40 · 107,049 sh | 107,049 | $275.1K | 0.00% | -10.9% |
| 41 | DEUTSCHE BANK AG\#41 · 100,842 sh | 100,842 | $248.1K | <0.01% | +8.8% |
| 42 | WELLS FARGO & COMPANY#42 · 100,229 sh | 100,229 | $246.6K | 0.00% | +99.9% |
| 43 | ALLIANCEBERNSTEIN L.P.#43 · 155,992 sh | 155,992 | $244.9K | <0.01% | +3.6% |
| 44 | PRICE T ROWE ASSOCIATES#44 · 80,106 sh | 80,106 | $198.0K | 0.00% | +4.0% |
| 45 | AMERICAN CENTURY COMPANIES#45 · 75,083 sh | 75,083 | $184.7K | <0.01% | +115.7% |
| 46 | XTX Topco Ltd#46 · 73,907 sh | 73,907 | $181.8K | <0.01% | +65.5% |
| 47 | Connor, Clark & Lunn Investment Management Ltd.#47 · 72,357 sh | 72,357 | $178.0K | <0.01% | +411.9% |
| 48 | MetLife Investment Management#48 · 65,744 sh | 65,744 | $161.7K | <0.01% | +36.6% |
| 49 | Russell Investments Group, Ltd.#49 · 63,783 sh | 63,783 | $156.9K | <0.01% | +490.6% |
| 50 | CITADEL ADVISORS#50 · 58,190 sh | 58,190 | $143.1K | 0.00% | -74.6% |
| 51 | THRIVENT FINANCIAL FOR LUTHERANS#51 · 55,342 sh | 55,342 | $136.0K | <0.01% | New |
| 52 | CITIGROUP#52 · 54,667 sh | 54,667 | $134.5K | 0.00% | +460.6% |
| 53 | SEI INVESTMENTS#53 · 53,390 sh | 53,390 | $131.3K | <0.01% | -11.9% |
| 54 | Shay Capital#54 · 51,500 sh | 51,500 | $126.7K | <0.01% | +3.7% |
| 55 | Vanguard Global Advisers#55 · 51,396 sh | 51,396 | $126.4K | <0.01% | 0.0% |
| 56 | MIRAE ASSET GLOBAL ETFS Ltd.#56 · 50,644 sh | 50,644 | $124.6K | <0.01% | +1.1% |
| 57 | BLAIR WILLIAM#57 · 43,394 sh | 43,394 | $106.7K | <0.01% | +0.4% |
| 58 | Police & Firemen's Retirement System of New Jersey#58 · 42,217 sh | 42,217 | $103.9K | <0.01% | +87.1% |
| 59 | PRUDENTIAL FINANCIAL#59 · 38,969 sh | 38,969 | $95.9K | <0.01% | +102.1% |
| 60 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#60 · 35,691 sh | 35,691 | $87.8K | 0.00% | -14.3% |
| 61 | Squarepoint Ops#61 · 35,357 sh | 35,357 | $87.0K | <0.01% | +252.4% |
| 62 | LPL Financial#62 · 34,821 sh | 34,821 | $85.7K | 0.00% | -3.7% |
| 63 | LMR Partners LLP#63 · 897,392 sh | 897,392 | $79.6K | <0.01% | 0.0% |
| 64 | WOODSTOCK#64 · 29,376 sh | 29,376 | $72.3K | — | -14.6% |
| 65 | INTECH INVESTMENT MANAGEMENT#65 · 27,824 sh | 27,824 | $68.4K | <0.01% | -3.8% |
| 66 | BARCLAYS PLC#66 · 26,469 sh | 26,469 | $65.1K | 0.00% | -8.0% |
| 67 | MANUFACTURERS LIFE INSURANCE COMPANY, THE#67 · 24,785 sh | 24,785 | $61.0K | 0.00% | -14.4% |
| 68 | VOYA INVESTMENT MANAGEMENT#68 · 23,613 sh | 23,613 | $58.1K | <0.01% | +29.8% |
| 69 | China Universal Asset Management , Ltd.#69 · 23,072 sh | 23,072 | $56.8K | <0.01% | -9.7% |
| 70 | ARISTEIA CAPITAL, L.L.C.#70 · 679,919 sh | 679,919 | $53.5K | <0.01% | 0.0% |
| 71 | HighTower Advisors#71 · 21,609 sh | 21,609 | $53.2K | <0.01% | +2.6% |
| 72 | BFSG#72 · 20,815 sh | 20,815 | $51.2K | <0.01% | 0.0% |
| 73 | Qube Research & Technologies Ltd#73 · 20,186 sh | 20,186 | $49.7K | 0.00% | New |
| 74 | BNP PARIBAS FINANCIAL MARKETS#74 · 19,822 sh | 19,822 | $48.8K | 0.00% | -27.5% |
| 75 | Quadrature Capital Ltd#75 · 19,492 sh | 19,492 | $48.0K | <0.01% | New |
| 76 | ProShare Advisors#76 · 19,155 sh | 19,155 | $47.1K | <0.01% | -15.1% |
| 77 | UBS Group AG#77 · 37,586 sh | 37,586 | $45.1K | 0.00% | -69.3% |
| 78 | Thrive Wealth Management#78 · 18,046 sh | 18,046 | $44.4K | — | +4.4% |
| 79 | Hudson Bay Capital Management#79 · 465,229 sh | 465,229 | $41.3K | <0.01% | 0.0% |
| 80 | TWO SIGMA SECURITIES#80 · 15,726 sh | 15,726 | $38.7K | <0.01% | New |
| 81 | OSAIC#81 · 15,459 sh | 15,459 | $38.0K | 0.00% | +181.1% |
| 82 | CANADA PENSION PLAN INVESTMENT BOARD#82 · 15,100 sh | 15,100 | $37.1K | 0.00% | New |
| 83 | VICTORY CAPITAL MANAGEMENT#83 · 13,649 sh | 13,649 | $33.6K | 0.00% | +1.2% |
| 84 | MERCER GLOBAL ADVISORS#84 · 12,357 sh | 12,357 | $30.4K | 0.00% | +23.0% |
| 85 | CHOREO#85 · 12,232 sh | 12,232 | $30.1K | <0.01% | +0.4% |
| 86 | Anson Funds Management#86 · 11,833 sh | 11,833 | $29.1K | <0.01% | 0.0% |
| 87 | NEW YORK STATE COMMON RETIREMENT FUND#87 · 11,806 sh | 11,806 | $29.0K | 0.00% | 0.0% |
| 88 | Legal & General Group Plc#88 · 11,284 sh | 11,284 | $27.8K | 0.00% | +21.4% |
| 89 | Legato Capital Management#89 · 10,913 sh | 10,913 | $26.8K | <0.01% | -61.3% |
| 90 | Vanguard Personalized Indexing Management#90 · 10,793 sh | 10,793 | $26.6K | <0.01% | -57.2% |
| 91 | Virtu Financial#91 · 10,565 sh | 10,565 | $26.0K | <0.01% | New |
| 92 | XPONANCE#92 · 10,472 sh | 10,472 | $25.8K | <0.01% | New |
| 93 | Ameritas Investment Partners#93 · 9,652 sh | 9,652 | $23.7K | <0.01% | 0.0% |
| 94 | Sculptor Capital#94 · 293,802 sh | 293,802 | $23.1K | <0.01% | 0.0% |
| 95 | Tower Research Capital (TRC)#95 · 8,044 sh | 8,044 | $19.8K | <0.01% | -77.2% |
| 96 | SUMMIT SECURITIES GROUP#96 · 7,882 sh | 7,882 | $19.4K | <0.01% | New |
| 97 | Steigerwald, Gordon & Koch#97 · 7,673 sh | 7,673 | $18.9K | <0.01% | 0.0% |
| 98 | Calamos Advisors#98 · 200,000 sh | 200,000 | $16.7K | <0.01% | 0.0% |
| 99 | Mirae Asset Global Investments , Ltd.#99 · 6,484 sh | 6,484 | $16.0K | 0.00% | -17.2% |
| 100 | Integrated Wealth Concepts#100 · 5,710 sh | 5,710 | $14.0K | <0.01% | -46.4% |
Funds that sold out of OABI in Q2 2026 (17)
Held OABI at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Stonepine Capital Management164,045 sh | 164,045 | $257.6K |
| JACOBS LEVY EQUITY MANAGEMENT42,966 sh | 42,966 | $67.5K |
| NINE MASTS CAPITAL Ltd29,062 sh | 29,062 | $45.6K |
| JANE STREET GROUP27,551 sh | 27,551 | $43.3K |
| State of Wyoming24,694 sh | 24,694 | $38.8K |
| Point72 Asset Management, L.P.16,238 sh | 16,238 | $25.5K |
| Diversified Enterprises11,311 sh | 11,311 | $17.8K |
| Abel Hall10,704 sh | 10,704 | $16.8K |
| MAI Capital Management4,821 sh | 4,821 | $7.6K |
| Essential Partners1,060 sh | 1,060 | $1.7K |
| Western Wealth Management416 sh | 416 | $653.00 |
| SIMPLEX TRADING283 sh | 283 | $444.00 |
| TWIN PEAKS WEALTH ADVISORS58 sh | 58 | $91.00 |
| FARMERS & MERCHANTS INVESTMENTS53 sh | 53 | $83.00 |
| Transamerica Financial Advisors29 sh | 29 | $45.00 |
| Wealth Preservation Advisors19 sh | 19 | $30.00 |
| Root Financial Partners13 sh | 13 | $20.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.