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OmniAb
OABI

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, 32 reducing their positions, and 33 closing their positions.

New
Increased
Maintained
Reduced
Closed

100% more funds holding in top 10

Funds holding in top 10: 1 → 2 (+1)

75% more repeat investments, than reductions

Existing positions increased: 56 | Existing positions reduced: 32

5% less funds holding

Funds holding: 152 → 144 (-8)

7.01% less ownership

Funds ownership: 52% → 44.98% (-7%)

24% less first-time investments, than exits

New positions opened: 25 | Existing positions closed: 33

37% less capital invested

Capital invested by funds: $152M → $95.5M (-$56.7M)

Holders
144
Holders Change
-8
Holders Change %
-5.26%
% of All Funds
1.9%
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
32
Closed
33
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
WCM
Whitefort Capital Management
New York
+$10.6M
2
Citadel Advisors
Citadel Advisors
Florida
+$3.24M
3
KLP
Kent Lake PR
Puerto Rico
+$2.55M
4
Jacobs Levy Equity Management
Jacobs Levy Equity Management
New Jersey
+$1.85M
5
Renaissance Technologies
Renaissance Technologies
New York
+$1.14M

Top Sellers

Rank Fund Capital Flow
1
Janus Henderson Group
Janus Henderson Group
United Kingdom
-$19.5M
2
Macquarie Group
Macquarie Group
Australia
-$10.6M
3
RCMNY
Rubric Capital Management (New York)
New York
-$6.84M
4
CC
Chicago Capital
Illinois
-$6.29M
5
SDJVC
St. Denis J. Villere & Co
Louisiana
-$3.45M
Name Holding Trade Value Shares
Change 		Change in
Stake
WCM
1
Whitefort Capital Management
New York
$17.8M +$10.6M +6,325,250 +162%
BlackRock
2
BlackRock
New York
$12.2M -$96.3K -57,563 -0.8%
Vanguard Group
3
Vanguard Group
Pennsylvania
$9.17M +$149K +89,009 +2%
Dimensional Fund Advisors
4
Dimensional Fund Advisors
Texas
$5.07M -$365K -217,954 -7%
RHJA
5
Rice Hall James & Associates
California
$4.57M +$77.5K +46,343 +2%
PMG
6
Private Management Group
California
$4.45M +$47.3K +28,286 +1%
Geode Capital Management
7
Geode Capital Management
Massachusetts
$4.25M -$36.2K -21,626 -0.9%
Citadel Advisors
8
Citadel Advisors
Florida
$3.71M +$3.24M +1,938,568 +999%
State Street
9
State Street
Massachusetts
$3.5M +$150K +89,626 +5%
KLP
10
Kent Lake PR
Puerto Rico
$3.04M +$2.55M +1,525,000 +678%
Jacobs Levy Equity Management
11
Jacobs Levy Equity Management
New Jersey
$1.92M +$1.85M +1,105,524 New
RA
12
Royce & Associates
New York
$1.51M +$83.7K +50,000 +6%
Northern Trust
13
Northern Trust
Illinois
$1.46M +$16.3K +9,743 +1%
Charles Schwab
14
Charles Schwab
California
$1.45M +$35.6K +21,296 +3%
TL
15
TowerView LLC
New York
$1.45M +$420K +251,100 +43%
JP Morgan Chase
16
JP Morgan Chase
New York
$1.38M +$293K +175,297 +28%
Morgan Stanley
17
Morgan Stanley
New York
$1.34M +$450K +268,957 +54%
Renaissance Technologies
18
Renaissance Technologies
New York
$1.23M +$1.14M +680,950 +2,560%
WC
19
Woodstock Corp
Massachusetts
$1.08M -$202K -121,016 -16%
IP
20
Isthmus Partners
Wisconsin
$988K +$166K +99,336 +21%
Millennium Management
21
Millennium Management
New York
$917K +$868K +518,645 +394%
M
22
Murchinson
Ontario, Canada
$875K -$845K -505,000 -50%
N
23
Nuveen
North Carolina
$848K +$434K +259,460 +114%
Marshall Wace
24
Marshall Wace
United Kingdom
$626K +$602K +359,665 New
Royal Bank of Canada
25
Royal Bank of Canada
Ontario, Canada
$596K +$560K +334,739 +4,613%
1
2 3 4 5

OABI Hedge Fund Activity: Q2 2025 in Review

144 of the 7,596 institutional investors tracked by Wall St. Rank reported a position in OmniAb (OABI) for Q2 2025, worth a combined $95.5M — down 37% from $152M a quarter earlier.

Sellers outnumbered buyers: 33 funds closed out of OABI and 25 opened new positions — a net loss of 8 holders — while 32 trimmed existing stakes and 56 added.

The largest buyer was Whitefort Capital Management, adding an estimated $10.6M. The largest seller was Janus Henderson Group, exiting entirely with an estimated $19.5M sold.

  • 144 institutional investors held OmniAb (OABI) as of Q2 2025, down from 152 in Q1 2025.
  • Funds reported $95.5M of OmniAb stock for Q2 2025, down 37% quarter-over-quarter.
  • 25 funds opened new OmniAb positions in Q2 2025 and 33 closed out, a net change of -8 holders.
  • The largest OmniAb buyer in Q2 2025 was Whitefort Capital Management, an estimated $10.6M added.
  • The largest OmniAb seller in Q2 2025 was Janus Henderson Group, an estimated $19.5M sold.

Based on aggregated 13F filings for Q2 2025.