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OmniAb
OABI

Overview Fund Activity

142 hedge funds and large institutions have $95.3M invested in OmniAb in 2025 Q2 according to their latest regulatory filings, with 25 funds opening new positions, 55 increasing their positions, 30 reducing their positions, and 32 closing their positions.

Holders
142
Holders Change
-9
Holders Change %
-5.96%
% of All Funds
1.91%
Holding in Top 10
2
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+100%
% of All Funds
0.03%
New
25
Increased
55
Reduced
30
Closed
32
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

1
WCM
1
Whitefort Capital Management
New York
$17.8M
2
Citadel Advisors
2
Citadel Advisors
Florida
$3.71M
3
KLP
3
Kent Lake PR
Puerto Rico
$3.05M
4
Jacobs Levy Equity Management
4
Jacobs Levy Equity Management
New Jersey
$1.92M
5
Renaissance Technologies
5
Renaissance Technologies
New York
$1.23M

Top Sellers

1
Janus Henderson Group
1
Janus Henderson Group
United Kingdom
$0
2
Macquarie Group
2
Macquarie Group
Australia
$0
3
RCMNY
3
Rubric Capital Management (New York)
New York
$0
4
CC
4
Chicago Capital
Illinois
$0
5
SDJVC
5
St. Denis J. Villere & Co
Louisiana
$0
Name Market Value Shares Shares
Change 		Shares
Change %
ACM
26
ADAR1 Capital Management
Texas
$567K 326,108 +200,000 +159%
Goldman Sachs
27
Goldman Sachs
New York
$533K 306,046 +62,377 +26%
TCM
28
Tang Capital Management
California
$522K 300,000 – –
Ameriprise
29
Ameriprise
Minnesota
$487K 279,789 +250,479 +855%
Bank of New York Mellon
30
Bank of New York Mellon
New York
$471K 270,751 +12,609 +5%
TA
31
TLS Advisors
Florida
$435K 250,185 – –
Two Sigma Investments
32
Two Sigma Investments
New York
$403K 231,688 +231,688 New
BFM
33
Boothbay Fund Management
New York
$328K 188,554 -189,375 -50%
Barclays
34
Barclays
United Kingdom
$316K 181,677 +76,064 +72%
Deutsche Bank
35
Deutsche Bank
Germany
$292K 167,551 -265,308 -61%
CC
36
Cornerstone Capital
California
$285K 163,762 -8,254 -5%
RhumbLine Advisers
37
RhumbLine Advisers
Massachusetts
$280K 160,728 +9,163 +6%
Jane Street
38
Jane Street
New York
$268K 153,736 +72,958 +90%
AllianceBernstein
39
AllianceBernstein
Tennessee
$262K 150,592 +31,200 +26%
UBS Group
40
UBS Group
Switzerland
$241K 138,462 -127,909 -48%
Fidelity Investments
41
Fidelity Investments
Massachusetts
$240K 137,801 +6,275 +5%
XT
42
XTX Topco
Cayman Islands
$239K 137,171 +83,687 +156%
NFC
43
Northeast Financial Consultants
Connecticut
$193K 110,996 – –
Invesco
44
Invesco
Georgia
$191K 109,613 +15,912 +17%
Two Sigma Advisers
45
Two Sigma Advisers
New York
$188K 107,930 +107,930 New
MFS
46
Mirabella Financial Services
United Kingdom
$175K 100,381 – –
Ohio Public Employees Retirement System (OPERS)
47
Ohio Public Employees Retirement System (OPERS)
Ohio
$168K 96,361 +96,361 New
Wells Fargo
48
Wells Fargo
California
$128K 73,641 +2,684 +4%
CSS
49
Cubist Systematic Strategies
Connecticut
$126K 72,145 +72,145 New
Bank of America
50
Bank of America
North Carolina
$124K 71,031 -471,909 -87%
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