OABI OmniAb, Inc.

NASDAQ
$4.44

OmniAb, Inc. (OABI) Institutional Ownership

What the institutions did with OABI last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared
160
filed both this quarter and last
Managers holding
143
+16 on the quarter
Buyers
91
33 opened new
Sellers
49
17 sold out entirely
Buyer share
65.0%
of managers who traded it
Breadth
+30.0
net buyers, as a share of those trading

Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
Whitefort Capital Management, LP 10.2M 16.5%
BlackRock, Inc. 8.9M 14.3%
NOMURA HOLDINGS INC 5.0M 8.1%
CADIAN CAPITAL MANAGEMENT, LP 4.2M 6.8%
VANGUARD CAPITAL MANAGEMENT LLC 3.9M 6.2%
GEODE CAPITAL MANAGEMENT, LLC 2.9M 4.7%
RICE HALL JAMES & ASSOCIATES, LLC 2.6M 4.2%
PRIVATE MANAGEMENT GROUP INC 2.3M 3.8%
STATE STREET CORP 2.1M 3.4%
DIMENSIONAL FUND ADVISORS LP 1.3M 2.0%
TOWERVIEW LLC 1.2M 1.9%
VANGUARD PORTFOLIO MANAGEMENT LLC 980.4K 1.6%
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 966.9K 1.6%
NORTHERN TRUST CORP 948.3K 1.5%
ADAR1 Capital Management, LLC 947.4K 1.5%
LMR Partners LLP 897.4K 1.4%
ISTHMUS PARTNERS, LLC 803.4K 1.3%
VANGUARD FIDUCIARY TRUST CO 758.5K 1.2%
ARISTEIA CAPITAL, L.L.C. 679.9K 1.1%
TWO SIGMA INVESTMENTS, LP 657.4K 1.1%
Nuveen, LLC 642.8K 1.0%
RENAISSANCE TECHNOLOGIES LLC 600.4K 1.0%
Arbiter Partners Capital Management LLC 577.8K 0.9%
D. E. Shaw & Co., Inc. 559.4K 0.9%
MACKENZIE FINANCIAL CORP 489.1K 0.8%

Largest changes

Manager Action Previous Current Change
NOMURA HOLDINGS INC Increased 705.0K 5.0M +4.3M
Whitefort Capital Management, LP Reduced 14.2M 10.2M -4.0M
LMR Partners LLP New 0 897.4K +897.4K
BlackRock, Inc. Increased 8.1M 8.9M +790.6K
ARISTEIA CAPITAL, L.L.C. New 0 679.9K +679.9K
MACKENZIE FINANCIAL CORP New 0 489.1K +489.1K
DIMENSIONAL FUND ADVISORS LP Reduced 1.7M 1.3M -483.1K
Hudson Bay Capital Management LP New 0 465.2K +465.2K
Arbiter Partners Capital Management LLC Increased 192.6K 577.8K +385.2K
RENAISSANCE TECHNOLOGIES LLC Increased 269.6K 600.4K +330.8K
Sculptor Capital LP New 0 293.8K +293.8K
ADAR1 Capital Management, LLC Increased 705.2K 947.4K +242.2K
Calamos Advisors LLC New 0 200.0K +200.0K
TOWERVIEW LLC Increased 1.0M 1.2M +180.0K
D. E. Shaw & Co., Inc. Increased 380.3K 559.4K +179.2K
CITADEL ADVISORS LLC Reduced 228.7K 58.2K -170.5K
Stonepine Capital Management, LLC Sold Out 164.0K 0 -164.0K
Palumbo Wealth Management LLC New 0 162.0K +162.0K
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP New 0 159.6K +159.6K
MMCAP International Inc. SPC New 0 158.3K +158.3K
TWO SIGMA INVESTMENTS, LP Increased 512.7K 657.4K +144.7K
Walleye Capital LLC New 0 144.4K +144.4K
VANGUARD CAPITAL MANAGEMENT LLC Reduced 4.0M 3.9M -141.3K
ACADIAN ASSET MANAGEMENT LLC New 0 132.4K +132.4K
PRIVATE MANAGEMENT GROUP INC Reduced 2.4M 2.3M -84.4K
VANGUARD PORTFOLIO MANAGEMENT LLC Increased 903.8K 980.4K +76.6K
NORTHERN TRUST CORP Increased 880.9K 948.3K +67.4K
STATE STREET CORP Increased 2.1M 2.1M +66.4K
UBS Group AG Reduced 102.5K 37.6K -64.9K
RICE HALL JAMES & ASSOCIATES, LLC Increased 2.5M 2.6M +63.2K
Connor, Clark & Lunn Investment Management Ltd. Increased 14.1K 72.4K +58.2K
Thrivent Financial for Lutherans New 0 55.3K +55.3K
CADIAN CAPITAL MANAGEMENT, LP Increased 4.2M 4.2M +54.7K
CSS LLC/IL New 0 54.7K +54.7K
Russell Investments Group, Ltd. Increased 10.8K 63.8K +53.0K
WELLS FARGO & COMPANY/MN Increased 50.1K 100.2K +50.1K
MILLENNIUM MANAGEMENT LLC Reduced 523.9K 474.2K -49.8K
ISTHMUS PARTNERS, LLC Increased 756.7K 803.4K +46.8K
CITIGROUP INC Increased 9.8K 54.7K +44.9K
Bank of New York Mellon Corp Increased 274.5K 318.4K +44.0K
JACOBS LEVY EQUITY MANAGEMENT, INC Sold Out 43.0K 0 -43.0K
AQR CAPITAL MANAGEMENT LLC Increased 115.6K 157.7K +42.1K
GEODE CAPITAL MANAGEMENT, LLC Reduced 2.9M 2.9M -41.6K
AMERICAN CENTURY COMPANIES INC Increased 34.8K 75.1K +40.3K
MORGAN STANLEY Reduced 407.9K 371.5K -36.4K
GOLDMAN SACHS GROUP INC Reduced 419.0K 384.6K -34.5K
VANGUARD FIDUCIARY TRUST CO Increased 725.6K 758.5K +32.9K
TLS Advisors LLC Reduced 250.2K 220.7K -29.5K
XTX Topco Ltd Increased 44.7K 73.9K +29.2K
NINE MASTS CAPITAL Ltd Sold Out 29.1K 0 -29.1K
BANK OF AMERICA CORP /DE/ Increased 121.7K 149.5K +27.8K
WOLVERINE ASSET MANAGEMENT LLC New 0 27.6K +27.6K
JANE STREET GROUP, LLC Sold Out 27.6K 0 -27.6K
Tower Research Capital LLC (TRC) Reduced 35.3K 8.0K -27.3K
Invesco Ltd. Increased 135.1K 161.4K +26.3K
Squarepoint Ops LLC Increased 10.0K 35.4K +25.3K
State of Wyoming Sold Out 24.7K 0 -24.7K
Qube Research & Technologies Ltd New 0 20.2K +20.2K
PRUDENTIAL FINANCIAL INC Increased 19.3K 39.0K +19.7K
Police & Firemen's Retirement System of New Jersey Increased 22.6K 42.2K +19.6K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.