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OmniAb
OABI

Overview Fund Activity

144 hedge funds and large institutions have $95.5M invested in OmniAb in 2025 Q2 according to their latest regulatory filings, with 25 funds opening new positions, 56 increasing their positions, 31 reducing their positions, and 32 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
144
Holders Change
-7
Holders Change %
-4.64%
% of All Funds
1.93%
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
56
Reduced
31
Closed
32
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

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

Top Sellers

1
Janus Henderson Group
Janus Henderson Group
United Kingdom
$0
2
Macquarie Group
Macquarie Group
Australia
$0
3
RCMNY
Rubric Capital Management (New York)
New York
$0
4
CC
Chicago Capital
Illinois
$0
5
SDJVC
St. Denis J. Villere & Co
Louisiana
$0
Name Holding Trade Value Shares
Change 		Shares
Change %
WCM
1
Whitefort Capital Management
New York
$17.8M +$11M +6,325,250 +162%
BlackRock
2
BlackRock
New York
$12.2M -$100K -57,563 -0.8%
Vanguard Group
3
Vanguard Group
Pennsylvania
$9.17M +$155K +89,009 +2%
Dimensional Fund Advisors
4
Dimensional Fund Advisors
Texas
$5.07M -$379K -217,954 -7%
RHJA
5
Rice Hall James & Associates
California
$4.57M +$80.6K +46,343 +2%
PMG
6
Private Management Group
California
$4.45M +$49.2K +28,286 +1%
Geode Capital Management
7
Geode Capital Management
Massachusetts
$4.25M -$37.6K -21,626 -0.9%
Citadel Advisors
8
Citadel Advisors
Florida
$3.71M +$3.37M +1,938,568 +999%
State Street
9
State Street
Massachusetts
$3.5M +$156K +89,626 +5%
KLP
10
Kent Lake PR
Puerto Rico
$3.05M +$2.65M +1,525,000 +678%
Jacobs Levy Equity Management
11
Jacobs Levy Equity Management
New Jersey
$1.92M +$1.92M +1,105,524 New
RA
12
Royce & Associates
New York
$1.51M +$87K +50,000 +6%
Northern Trust
13
Northern Trust
Illinois
$1.46M +$17K +9,743 +1%
Charles Schwab
14
Charles Schwab
California
$1.45M +$37.1K +21,296 +3%
TL
15
TowerView LLC
New York
$1.45M +$437K +251,100 +43%
JPMorgan Chase & Co
16
JPMorgan Chase & Co
New York
$1.38M +$305K +175,297 +28%
Morgan Stanley
17
Morgan Stanley
New York
$1.34M +$468K +268,957 +54%
Renaissance Technologies
18
Renaissance Technologies
New York
$1.23M +$1.18M +680,950 +2,560%
WC
19
Woodstock Corp
Massachusetts
$1.08M -$211K -121,016 -16%
IP
20
Isthmus Partners
Wisconsin
$988K +$173K +99,336 +21%
Millennium Management
21
Millennium Management
New York
$917K +$732K +518,645 +394%
M
22
Murchinson
Ontario, Canada
$875K -$879K -505,000 -50%
NL
23
Nuveen LLC
North Carolina
$848K +$451K +259,460 +114%
Marshall Wace
24
Marshall Wace
United Kingdom
$626K +$626K +359,665 New
Royal Bank of Canada
25
Royal Bank of Canada
Ontario, Canada
$596K +$583K +334,739 +4,613%
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