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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
NA
126
NewEdge Advisors
Louisiana
$302 – – –
CTC
127
Central Trust Company
Missouri
$274 – – –
SA
128
Scarborough Advisors
Maryland
$258 – – –
Comerica Bank
129
Comerica Bank
Texas
$203 – – –
WAM
130
Wolverine Asset Management
Illinois
$92 -$1.29K -708 -92%
FMII
131
Farmers & Merchants Investments Inc
Nebraska
$85 – – –
TFA
132
Transamerica Financial Advisors
Florida
$77 +$88 +48 New
UB
133
UMB Bank
Missouri
$46 – – –
SS
134
SBI Securities
Japan
$40 -$185 -101 -80%
MG
135
Mather Group
Illinois
$34 +$38 +21 New
PA
136
Parallel Advisors
California
$6 – – –
IA
137
IFP Advisors
Florida
$6 +$7 +4 New
CIAM
138
Caitong International Asset Management
Hong Kong
$2 -$6.77K -3,706 -100%
FFA
139
Farther Finance Advisors
California
$2 – – –
RA
140
Royce & Associates
New York
– -$1.51M -867,080 Closed
M
141
Murchinson
Ontario, Canada
– -$875K -502,810 Closed
Marshall Wace
142
Marshall Wace
United Kingdom
– -$626K -359,665 Closed
BFM
143
Boothbay Fund Management
New York
– -$328K -188,554 Closed
XT
144
XTX Topco
Cayman Islands
– -$239K -137,171 Closed
MFS
145
Mirabella Financial Services
United Kingdom
– -$175K -100,381 Closed
Manulife (Manufacturers Life Insurance)
146
Manulife (Manufacturers Life Insurance)
Ontario, Canada
– -$78K -44,809 Closed
State Board of Administration of Florida Retirement System
147
State Board of Administration of Florida Retirement System
Florida
– -$46.5K -26,753 Closed
US Bancorp
148
US Bancorp
Minnesota
– -$36.2K -20,794 Closed
CA
149
CWC Advisors
Oregon
– -$30K -17,261 Closed
AI
150
Atom Investors
Texas
– -$22.4K -12,854 Closed
3 4 5
6
7

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.