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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
ACM
26
ADAR1 Capital Management
Texas
$567K +$335K +200,000 +159%
Goldman Sachs
27
Goldman Sachs
New York
$533K +$104K +62,377 +26%
TCM
28
Tang Capital Management
California
$522K – – –
Ameriprise
29
Ameriprise
Minnesota
$487K +$419K +250,479 +855%
Bank of New York Mellon
30
Bank of New York Mellon
New York
$471K +$21.1K +12,609 +5%
TA
31
TLS Advisors
Florida
$435K – – –
Two Sigma Investments
32
Two Sigma Investments
New York
$403K +$388K +231,688 New
BFM
33
Boothbay Fund Management
New York
$328K -$317K -189,375 -50%
Barclays
34
Barclays
United Kingdom
$316K +$127K +76,064 +72%
Deutsche Bank
35
Deutsche Bank
Germany
$292K -$444K -265,308 -61%
CC
36
Cornerstone Capital
California
$285K -$13.8K -8,254 -5%
RhumbLine Advisers
37
RhumbLine Advisers
Massachusetts
$280K +$15.3K +9,163 +6%
Jane Street
38
Jane Street
New York
$268K +$122K +72,958 +90%
AllianceBernstein
39
AllianceBernstein
Tennessee
$262K +$52.2K +31,200 +26%
UBS Group
40
UBS Group
Switzerland
$241K -$214K -127,909 -48%
Fidelity Investments
41
Fidelity Investments
Massachusetts
$240K +$10.5K +6,275 +5%
XT
42
XTX Topco
Cayman Islands
$239K +$140K +83,687 +156%
Susquehanna International Group
43
Susquehanna International Group
Pennsylvania
$211K +$5.87K +3,506 +3%
NFC
44
Northeast Financial Consultants
Connecticut
$193K – – –
Invesco
45
Invesco
Georgia
$191K +$26.6K +15,912 +17%
Two Sigma Advisers
46
Two Sigma Advisers
New York
$188K +$181K +107,930 New
MFS
47
Mirabella Financial Services
United Kingdom
$175K -$168K -100,381 -50%
Ohio Public Employees Retirement System (OPERS)
48
Ohio Public Employees Retirement System (OPERS)
Ohio
$168K +$161K +96,361 New
Wells Fargo
49
Wells Fargo
California
$128K +$4.49K +2,684 +4%
CSS
50
Cubist Systematic Strategies
Connecticut
$126K +$121K +72,145 New
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.