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OmniAb
OABI

140 hedge funds and large institutions have $101M invested in OmniAb in 2025 Q3 according to their latest regulatory filings, with 16 funds opening new positions, 33 increasing their positions, 52 reducing their positions, and 18 closing their positions.

New
Increased
Maintained
Reduced
Closed

5% more capital invested

Capital invested by funds: $95.5M → $101M (+$5M)

1.24% less ownership

Funds ownership: 44.98% → 43.74% (-1.2%)

3% less funds holding

Funds holding: 144 → 140 (-4)

11% less first-time investments, than exits

New positions opened: 16 | Existing positions closed: 18

37% less repeat investments, than reductions

Existing positions increased: 33 | Existing positions reduced: 52

50% less funds holding in top 10

Funds holding in top 10: 2 → 1 (-1)

Holders
140
Holders Change
-4
Holders Change %
-2.78%
% of All Funds
1.84%
Holding in Top 10
1
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-50%
% of All Funds
0.01%
New
16
Increased
33
Reduced
52
Closed
18
Calls
$42K
Puts
–
Net Calls
+$42K
Net Calls Change
+$42K

Top Buyers

Rank Fund Capital Flow
1
WCM
Whitefort Capital Management
New York
+$7.28M
2
CCM
Cadian Capital Management
New York
+$6.72M
3
WP
Woodline Partners
California
+$5.22M
4
SCM
Stonepine Capital Management
Oregon
+$3.92M
5
ACM
ADAR1 Capital Management
Texas
+$1.4M

Top Sellers

Rank Fund Capital Flow
1
Citadel Advisors
Citadel Advisors
Florida
-$2.37M
2
KLP
Kent Lake PR
Puerto Rico
-$2.28M
3
RA
Royce & Associates
New York
-$1.51M
4
M
Murchinson
Ontario, Canada
-$875K
5
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
-$668K
Name Holding Trade Value Shares
Change 		Change in
Stake
Royal Bank of Canada
26
Royal Bank of Canada
Ontario, Canada
$485K -$71K -38,832 -11%
TCM
27
Tang Capital Management
California
$480K – – –
Two Sigma Investments
28
Two Sigma Investments
New York
$467K +$110K +60,047 +26%
Bank of New York Mellon
29
Bank of New York Mellon
New York
$422K -$12.9K -7,053 -3%
GCP
30
GSA Capital Partners
United Kingdom
$420K +$432K +236,197 +902%
TA
31
TLS Advisors
Florida
$388K – – –
Ameriprise
32
Ameriprise
Minnesota
$372K -$85.9K -47,002 -17%
Jane Street
33
Jane Street
New York
$303K +$64.6K +35,346 +23%
D.E. Shaw & Co
34
D.E. Shaw & Co
New York
$298K +$340K +186,281 New
GCM
35
Graham Capital Management
Connecticut
$267K +$305K +167,172 New
Millennium Management
36
Millennium Management
New York
$260K -$666K -364,515 -56%
RhumbLine Advisers
37
RhumbLine Advisers
Massachusetts
$257K +$380 +208 +0.1%
APCM
38
Arbiter Partners Capital Management
New York
$257K +$293K +160,529 New
Fidelity Investments
39
Fidelity Investments
Massachusetts
$247K +$30.6K +16,745 +12%
BCM
40
Bridgeway Capital Management
Texas
$246K +$183K +100,000 +186%
AllianceBernstein
41
AllianceBernstein
Tennessee
$241K – – –
Barclays
42
Barclays
United Kingdom
$230K -$69.4K -37,967 -21%
Two Sigma Advisers
43
Two Sigma Advisers
New York
$202K +$33.1K +18,100 +17%
Invesco
44
Invesco
Georgia
$198K +$26.4K +14,438 +13%
CC
45
Cornerstone Capital
California
$175K -$99.7K -54,551 -33%
Ohio Public Employees Retirement System (OPERS)
46
Ohio Public Employees Retirement System (OPERS)
Ohio
$154K – – –
SEI Investments
47
SEI Investments
Pennsylvania
$130K +$36.4K +19,919 +33%
Wells Fargo
48
Wells Fargo
California
$129K +$12.7K +6,955 +9%
Deutsche Bank
49
Deutsche Bank
Germany
$125K -$164K -89,554 -53%
HF
50
HRT Financial
New York
$112K +$128K +70,215 New
1
2
3 4 5

OABI Hedge Fund Activity: Q3 2025 in Review

140 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in OmniAb (OABI) for Q3 2025, worth a combined $101M — up 5.2% from $95.5M a quarter earlier.

Sellers outnumbered buyers: 18 funds closed out of OABI and 16 opened new positions — a net loss of 2 holders — while 52 trimmed existing stakes and 33 added.

The largest buyer was Whitefort Capital Management, adding an estimated $7.28M. The largest seller was Citadel Advisors, cutting an estimated $2.37M.

  • 140 institutional investors held OmniAb (OABI) as of Q3 2025, down from 144 in Q2 2025.
  • Funds reported $101M of OmniAb stock for Q3 2025, up 5.2% quarter-over-quarter.
  • 16 funds opened new OmniAb positions in Q3 2025 and 18 closed out, a net change of -2 holders.
  • The largest OmniAb buyer in Q3 2025 was Whitefort Capital Management, an estimated $7.28M added.
  • The largest OmniAb seller in Q3 2025 was Citadel Advisors, an estimated $2.37M sold.

Based on aggregated 13F filings for Q3 2025.