Organon & Co
634 hedge funds and large institutions have $1.43B invested in Organon & Co in 2025 Q4 according to their latest regulatory filings, with 99 funds opening new positions, 134 increasing their positions, 230 reducing their positions, and 123 closing their positions.
200% more funds holding in top 10
Funds holding in top 10: 1 → 3 (+2)
0.46% less ownership
Funds ownership: 76.91% → 76.44% (-0.46%)
5% less funds holding
Funds holding: 670 → 634 (-36)
20% less first-time investments, than exits
New positions opened: 99 | Existing positions closed: 123
24% less call options, than puts
Call options by funds: $22M | Put options by funds: $29.1M
33% less capital invested
Capital invested by funds: $2.13B → $1.43B (-$708M)
42% less repeat investments, than reductions
Existing positions increased: 134 | Existing positions reduced: 230
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AQR Capital Management
Greenwich,
Connecticut
|
+$34.7M |
| 2 |
SCM
Sio Capital Management
New York
|
+$27M |
| 3 |
D.E. Shaw & Co
New York
|
+$22.9M |
| 4 |
Jane Street
New York
|
+$13.5M |
| 5 |
Citadel Advisors
Miami,
Florida
|
+$13M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
-$32.1M |
| 2 |
Nordea Investment Management
Stockholm,
Sweden
|
-$31.7M |
| 3 |
Balyasny Asset Management
Chicago,
Illinois
|
-$23.9M |
| 4 |
BGIM
Brandywine Global Investment Management
Philadelphia,
Pennsylvania
|
-$23.6M |
| 5 |
Massachusetts Financial Services
Boston,
Massachusetts
|
-$20.7M |
OGN Hedge Fund Activity: Q4 2025 in Review
634 of the 8,266 institutional investors tracked by Wall St. Rank reported a position in Organon & Co (OGN) for Q4 2025, worth a combined $1.43B — down 33% from $2.13B a quarter earlier.
Sellers outnumbered buyers: 123 funds closed out of OGN and 99 opened new positions — a net loss of 24 holders — while 230 trimmed existing stakes and 134 added.
The largest buyer was AQR Capital Management, adding an estimated $34.7M. The largest seller was Millennium Management, cutting an estimated $32.1M.
- 634 institutional investors held Organon & Co (OGN) as of Q4 2025, down from 670 in Q3 2025.
- Funds reported $1.43B of Organon & Co stock for Q4 2025, down 33% quarter-over-quarter.
- 99 funds opened new Organon & Co positions in Q4 2025 and 123 closed out, a net change of -24 holders.
- The largest Organon & Co buyer in Q4 2025 was AQR Capital Management, an estimated $34.7M added.
- The largest Organon & Co seller in Q4 2025 was Millennium Management, an estimated $32.1M sold.
Based on aggregated 13F filings for Q4 2025.