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.
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
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
+$1.91M |
| 2 |
CCM
Cadian Capital Management
New York
|
+$1.32M |
| 3 |
Vanguard Group
Malvern,
Pennsylvania
|
+$829K |
| 4 |
Geode Capital Management
Boston,
Massachusetts
|
+$689K |
| 5 |
Millennium Management
New York
|
+$674K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
WP
Woodline Partners
San Francisco,
California
|
-$4.47M |
| 2 |
SCM
Stonepine Capital Management
Bend,
Oregon
|
-$2.51M |
| 3 |
Jacobs Levy Equity Management
Florham Park,
New Jersey
|
-$1.33M |
| 4 |
Citadel Advisors
Miami,
Florida
|
-$959K |
| 5 |
JP Morgan Chase
New York
|
-$816K |
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.