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OmniAb
OABI

129 hedge funds and large institutions have $106M invested in OmniAb in 2025 Q4 according to their latest regulatory filings, with 14 funds opening new positions, 41 increasing their positions, 39 reducing their positions, and 21 closing their positions.

New
Increased
Maintained
Reduced
Closed

5% more capital invested

Capital invested by funds: $101M → $106M (+$5.24M)

5% more repeat investments, than reductions

Existing positions increased: 41 | Existing positions reduced: 39

0% more funds holding in top 10

Funds holding in top 10: 1 → 1 (0)

3.94% less ownership

Funds ownership: 43.74% → 39.8% (-3.9%)

8% less funds holding

Funds holding: 140 → 129 (-11)

33% less first-time investments, than exits

New positions opened: 14 | Existing positions closed: 21

Holders
129
Holders Change
-11
Holders Change %
-7.86%
% of All Funds
1.57%
Holding in Top 10
1
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.01%
New
14
Increased
41
Reduced
39
Closed
21
Calls
$48K
Puts
–
Net Calls
+$48K
Net Calls Change
+$6K

Top Buyers

Rank Fund Capital Flow
1
BlackRock
BlackRock
New York
+$1.91M
2
CCM
Cadian Capital Management
New York
+$1.32M
3
Vanguard Group
Vanguard Group
Pennsylvania
+$829K
4
Geode Capital Management
Geode Capital Management
Massachusetts
+$689K
5
Millennium Management
Millennium Management
New York
+$674K

Top Sellers

Rank Fund Capital Flow
1
WP
Woodline Partners
California
-$4.47M
2
SCM
Stonepine Capital Management
Oregon
-$2.51M
3
Jacobs Levy Equity Management
Jacobs Levy Equity Management
New Jersey
-$1.33M
4
Citadel Advisors
Citadel Advisors
Florida
-$959K
5
JP Morgan Chase
JP Morgan Chase
New York
-$816K
Name Holding Trade Value Shares
Change 		Change in
Stake
Renaissance Technologies
26
Renaissance Technologies
New York
$449K -$488K -280,754 -54%
Jacobs Levy Equity Management
27
Jacobs Levy Equity Management
New Jersey
$441K -$1.33M -768,067 -76%
Fidelity Investments
28
Fidelity Investments
Massachusetts
$368K +$77.2K +44,434 +29%
BCM
29
Bridgeway Capital Management
Texas
$368K +$78.2K +45,000 +29%
Two Sigma Advisers
30
Two Sigma Advisers
New York
$365K +$124K +71,500 +57%
APCM
31
Arbiter Partners Capital Management
New York
$356K +$55.7K +32,056 +20%
Barclays
32
Barclays
United Kingdom
$306K +$38K +21,847 +15%
RhumbLine Advisers
33
RhumbLine Advisers
Massachusetts
$301K +$3.19K +1,837 +1%
Nomura Holdings
34
Nomura Holdings
Japan
$287K +$269K +154,951 New
AllianceBernstein
35
AllianceBernstein
Tennessee
$279K – – –
Invesco
36
Invesco
Georgia
$252K +$21.3K +12,258 +10%
Jane Street
37
Jane Street
New York
$250K -$93.3K -53,704 -28%
Wells Fargo
38
Wells Fargo
California
$232K +$78.3K +45,040 +56%
CC
39
Cornerstone Capital
California
$202K – – –
Bank of America
40
Bank of America
North Carolina
$154K +$60.9K +35,058 +73%
Deutsche Bank
41
Deutsche Bank
Germany
$143K -$1.34K -772 -1%
TA
42
TLS Advisors
Florida
$137K -$313K -180,185 -72%
UBS Group
43
UBS Group
Switzerland
$126K +$49.2K +28,310 +71%
CIS
44
Connors Investor Services
Pennsylvania
$115K – – –
T. Rowe Price Associates
45
T. Rowe Price Associates
Maryland
$100K – – –
Mirae Asset Global ETFs Holdings
46
Mirae Asset Global ETFs Holdings
Hong Kong
$90.4K +$9.38K +5,395 +12%
BFM
47
Boothbay Fund Management
New York
$88.1K +$82.7K +47,596 New
Acadian Asset Management
48
Acadian Asset Management
Massachusetts
$88K +$82.8K +47,625 New
William Blair & Company
49
William Blair & Company
Illinois
$79.9K -$3.41K -1,960 -4%
SEI Investments
50
SEI Investments
Pennsylvania
$79.3K -$66.4K -38,185 -47%
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OABI Hedge Fund Activity: Q4 2025 in Review

129 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in OmniAb (OABI) for Q4 2025, worth a combined $106M — up 5.2% from $101M a quarter earlier.

Sellers outnumbered buyers: 21 funds closed out of OABI and 14 opened new positions — a net loss of 7 holders — while 39 trimmed existing stakes and 41 added.

The largest buyer was BlackRock, adding an estimated $1.91M. The largest seller was Woodline Partners, cutting an estimated $4.47M.

  • 129 institutional investors held OmniAb (OABI) as of Q4 2025, down from 140 in Q3 2025.
  • Funds reported $106M of OmniAb stock for Q4 2025, up 5.2% quarter-over-quarter.
  • 14 funds opened new OmniAb positions in Q4 2025 and 21 closed out, a net change of -7 holders.
  • The largest OmniAb buyer in Q4 2025 was BlackRock, an estimated $1.91M added.
  • The largest OmniAb seller in Q4 2025 was Woodline Partners, an estimated $4.47M sold.

Based on aggregated 13F filings for Q4 2025.