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.
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)
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
San Francisco,
California
|
+$5.22M |
| 4 |
SCM
Stonepine Capital Management
Bend,
Oregon
|
+$3.92M |
| 5 |
ACM
ADAR1 Capital Management
Austin,
Texas
|
+$1.4M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
-$2.37M |
| 2 |
KLP
Kent Lake PR
Anasco,
Puerto Rico
|
-$2.28M |
| 3 |
RA
Royce & Associates
New York
|
-$1.51M |
| 4 |
M
Murchinson
Toronto,
Ontario, Canada
|
-$875K |
| 5 |
Dimensional Fund Advisors
Austin,
Texas
|
-$668K |
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.