Organon & Co
607 hedge funds and large institutions have $1.2B invested in Organon & Co in 2026 Q1 according to their latest regulatory filings, with 82 funds opening new positions, 133 increasing their positions, 202 reducing their positions, and 94 closing their positions.
0.24% more ownership
Funds ownership: 76.46% → 76.7% (+0.24%)
4% less funds holding
Funds holding: 634 → 607 (-27)
13% less first-time investments, than exits
New positions opened: 82 | Existing positions closed: 94
14% less call options, than puts
Call options by funds: $19.2M | Put options by funds: $22.4M
16% less capital invested
Capital invested by funds: $1.43B → $1.2B (-$228M)
34% less repeat investments, than reductions
Existing positions increased: 133 | Existing positions reduced: 202
67% less funds holding in top 10
Funds holding in top 10: 3 → 1 (-2)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$47.6M |
| 2 |
TI
Think Investments
San Francisco,
California
|
+$30.1M |
| 3 |
Canada Pension Plan Investment Board
Toronto Ontario,
Ontario, Canada
|
+$19.4M |
| 4 |
Fidelity Investments
Boston,
Massachusetts
|
+$19M |
| 5 |
KBG
Kahn Brothers Group
New York
|
+$14.4M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Massachusetts Financial Services
Boston,
Massachusetts
|
-$39.1M |
| 2 |
AQR Capital Management
Greenwich,
Connecticut
|
-$38.5M |
| 3 |
SCM
Sio Capital Management
New York
|
-$19.2M |
| 4 |
Jane Street
New York
|
-$15.1M |
| 5 |
GAM
Gotham Asset Management
New York
|
-$10.5M |
OGN Hedge Fund Activity: Q1 2026 in Review
607 of the 8,172 institutional investors tracked by Wall St. Rank reported a position in Organon & Co (OGN) for Q1 2026, worth a combined $1.2B — down 16% from $1.43B a quarter earlier.
Sellers outnumbered buyers: 94 funds closed out of OGN and 82 opened new positions — a net loss of 12 holders — while 202 trimmed existing stakes and 133 added.
The largest buyer was Millennium Management, adding an estimated $47.6M. The largest seller was Massachusetts Financial Services, cutting an estimated $39.1M.
- 607 institutional investors held Organon & Co (OGN) as of Q1 2026, down from 634 in Q4 2025.
- Funds reported $1.2B of Organon & Co stock for Q1 2026, down 16% quarter-over-quarter.
- 82 funds opened new Organon & Co positions in Q1 2026 and 94 closed out, a net change of -12 holders.
- The largest Organon & Co buyer in Q1 2026 was Millennium Management, an estimated $47.6M added.
- The largest Organon & Co seller in Q1 2026 was Massachusetts Financial Services, an estimated $39.1M sold.
Based on aggregated 13F filings for Q1 2026.