Organon & Co
603 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, 200 reducing their positions, and 93 closing their positions.
0.44% more ownership
Funds ownership: 76.1% → 76.55% (+0.44%)
4% less funds holding
Funds holding: 631 → 603 (-28)
12% less first-time investments, than exits
New positions opened: 82 | Existing positions closed: 93
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: $1.42B → $1.2B (-$223M)
34% less repeat investments, than reductions
Existing positions increased: 133 | Existing positions reduced: 200
50% less funds holding in top 10
Funds holding in top 10: 2 → 1 (-1)
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
603 of the 8,126 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 $1.42B a quarter earlier.
Sellers outnumbered buyers: 93 funds closed out of OGN and 82 opened new positions — a net loss of 11 holders — while 200 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.
- 603 institutional investors held Organon & Co (OGN) as of Q1 2026, down from 631 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 93 closed out, a net change of -11 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.