Omniab, Inc.: which funds bought and sold

Institutions that bought and sold Omniab shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 76 institutions that filed 13F reports for both quarters added to or opened positions in Omniab, and 48 cut or closed them. Together they added a net 3.1M shares, +5.5% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 1.3M shares (+16.8%); index fund managers were net buyers of 853K shares (+4.1%). 20 opened a new position and 16 sold out entirely.

Bought, Q2 2026 76 institutions, 20 of them new holders Sold, Q2 2026 48 institutions, 16 of them sold out

Net change, all compared +3.1M shares (+5.5%)

Net change, active managers +1.3M shares (+16.8%), 16 bought, 5 sold

Buyers versus sellers

institutions compared, 144

76 bought 20 48 sold

Active managers and hedge funds 16 bought · 5 sold · +1.3M

Index fund managers 7 bought · 4 sold · +853K

Other institutions 53 bought · 39 sold · +929K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Nomura Holdings Inc	+4.3M +613.2%	5.0M	$12.4M
Blackrock, Inc. Index funds	+791K +9.8%	8.9M	$21.9M
Mackenzie Financial Corp	+489K New position	489K	$1.2M
Renaissance Technologies LLC Hedge fund	+331K +122.7%	600K	$1.5M
ADAR1 Capital Management, LLC Hedge fund	+242K +34.3%	947K	$2.3M
Arbiter Partners Capital Management LLC	+193K +100.0%	385K	$947,518
Towerview LLC	+180K +18.0%	1.2M	$2.9M
D. E. Shaw & Co., Inc. Hedge fund	+179K +47.1%	559K	$1.4M
Palumbo Wealth Management LLC	+162K New position	162K	$398,459
Arrowstreet Capital, Limited Partnership Hedge fund	+160K New position	160K	$392,668
Two Sigma Investments, LP Hedge fund	+145K +28.2%	657K	$1.6M
Walleye Capital LLC Hedge fund	+144K New position	144K	$355,290
Acadian Asset Management LLC Active manager	+132K New position	132K	$323,000
Vanguard Portfolio Management LLC Index funds	+77K +8.5%	980K	$2.4M
Northern Trust Corp Index funds	+67K +7.7%	948K	$2.3M
State Street Corp Index funds	+66K +3.2%	2.1M	$5.2M
Rice Hall James & Associates, LLC	+63K +2.5%	2.6M	$6.4M
Connor, Clark & Lunn Investment Management Ltd.	+58K +411.9%	72K	$177,999
Thrivent Financial For Lutherans	+55K New position	55K	$136,000
Cadian Capital Management, LP Hedge fund	+55K +1.3%	4.2M	$10.4M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Renaissance Technologies LLC Hedge fund	+331K +122.7%	600K	$1.5M
ADAR1 Capital Management, LLC Hedge fund	+242K +34.3%	947K	$2.3M
D. E. Shaw & Co., Inc. Hedge fund	+179K +47.1%	559K	$1.4M
Arrowstreet Capital, Limited Partnership Hedge fund	+160K New position	160K	$392,668
Two Sigma Investments, LP Hedge fund	+145K +28.2%	657K	$1.6M
Walleye Capital LLC Hedge fund	+144K New position	144K	$355,290
Acadian Asset Management LLC Active manager	+132K New position	132K	$323,000
Cadian Capital Management, LP Hedge fund	+55K +1.3%	4.2M	$10.4M
AQR Capital Management LLC Hedge fund	+42K +36.4%	158K	$387,981
American Century Companies Inc Active manager	+40K +115.7%	75K	$184,704

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Whitefort Capital Management, LP	−4.0M −27.9%	10.2M	$25.2M
Dimensional Fund Advisors LP	−483K −27.7%	1.3M	$3.1M
Citadel Advisors LLC Hedge fund	−170K −74.6%	58K	$143,147
Stonepine Capital Management, LLC	−164K Sold out	0	—
Vanguard Capital Management LLC Index funds	−141K −3.5%	3.9M	$9.5M
UBS Group AG	−85K −82.6%	18K	$43,908
Private Management Group Inc	−84K −3.5%	2.3M	$5.8M
Millennium Management LLC Hedge fund	−50K −9.5%	474K	$864,306
Jacobs Levy Equity Management, Inc Active manager	−43K Sold out	0	—
Geode Capital Management, LLC Index funds	−42K −1.4%	2.9M	$7.1M
Morgan Stanley	−36K −8.9%	372K	$913,905
Goldman Sachs Group Inc	−34K −8.2%	385K	$946,049
Tls Advisors LLC	−30K −11.8%	221K	$542,885
Nine Masts Capital Ltd	−29K Sold out	0	—
Jane Street Group, LLC	−28K Sold out	0	—
Tower Research Capital LLC (TRC)	−27K −77.2%	8,044	$19,788
State Of Wyoming	−25K Sold out	0	—
Point72 Asset Management, L.P. Hedge fund	−16K Sold out	0	—
Vanguard Personalized Indexing Management, LLC Index funds	−14K −57.2%	11K	$26,551
Jpmorgan Chase & Co	−13K −10.9%	107K	$275,115

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Citadel Advisors LLC Hedge fund	−170K −74.6%	58K	$143,147
Millennium Management LLC Hedge fund	−50K −9.5%	474K	$864,306
Jacobs Levy Equity Management, Inc Active manager	−43K Sold out	0	—
Point72 Asset Management, L.P. Hedge fund	−16K Sold out	0	—
Intech Investment Management LLC Active manager	−1,113 −3.8%	28K	$68,447

New positions

largest by value

Institution	Shares	Value June 30, 2026
Mackenzie Financial Corp	489K	$1.2M
Palumbo Wealth Management LLC	162K	$398,459
Arrowstreet Capital, Limited PartnershipHedge fund	160K	$392,668
Walleye Capital LLCHedge fund	144K	$355,290
Acadian Asset Management LLCActive manager	132K	$323,000
Thrivent Financial For Lutherans	55K	$136,000
Qube Research & Technologies LtdHedge fund	20K	$49,658
Quadrature Capital LtdHedge fund	19K	$47,950
Two Sigma Securities, LLC	16K	$38,686
Canada Pension Plan Investment Board	15K	$37,146

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Stonepine Capital Management, LLC	164K	$257,551
Jacobs Levy Equity Management, IncActive manager	43K	$67,457
Nine Masts Capital Ltd	29K	$45,627
Jane Street Group, LLC	28K	$43,255
State Of Wyoming	25K	$38,770
Point72 Asset Management, L.P.Hedge fund	16K	$25,494
Diversified Enterprises, LLC	11K	$17,758
Abel Hall, LLC	11K	$16,805
Mai Capital Management	4,821	$7,569
Essential Partners LLC	1,060	$1,664

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 130
Ten largest holders: 73.7%
Index fund managers: 36.7%
Active managers and hedge funds: 15.1%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	16	5	5	2	+1.3M	+16.8%
Index fund managers	7	4	0	0	+853K	+4.1%
Other institutions	53	39	15	14	+929K	+3.4%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Omniab.

Only managers that filed a holdings report for both quarters are compared (144 here). 3 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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