Magnetar Financial’s Organon & Co OGN Stock Holding History

Magnetar Financial’s Portfolio OGN Stock Details OGN Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$38M	Buy	+2,810,019	New	+$33.6M	0.35%	38
2025 Q1	–	Sell	-1,734,434	Closed	-$25.9M	–	886
2024 Q4	$25.9M	Buy	1,734,434 +1,471,731	+560%	+$24M	0.59%	53
2024 Q3	$5.03M	Sell	262,703 -640,122	-71%	-$13.3M	0.11%	151
2024 Q2	$18.7M	Sell	902,825 -941,858	-51%	-$18.7M	0.39%	72
2024 Q1	$34.7M	Sell	1,844,683 -380,680	-17%	-$6.53M	0.78%	45
2023 Q4	$32.1M	Buy	2,225,363 +30,675	+1%	+$417K	0.81%	38
2023 Q3	$38.1M	Buy	2,194,688 +463,872	+27%	+$9.67M	0.97%	29
2023 Q2	$36M	Buy	1,730,816 +1,449,944	+516%	+$31.5M	0.79%	46
2023 Q1	$6.61M	Buy	+280,872	New	+$7.54M	0.13%	137
2021 Q4	–	Sell	-40,115	Closed	-$1.31M	–	1502
2021 Q3	$1.31M	Sell	40,115 -1,164,091	-97%	-$37.2M	0.01%	671
2021 Q2	$36.4M	Buy	+1,204,206	New	+$39.6M	0.35%	48

Other funds holding OGN

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

PCM

Pentwater Capital Management Naples, Florida $16.4B AUM 55.44% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Man Group London, United Kingdom $62.7B AUM 29.77% 1-Year Est. Return

AQR Arbitrage Greenwich, Connecticut $7.02B AUM 31.58% 1-Year Est. Return

Magnetar Financial's OGN Position: Q2 2026 in Review

Magnetar Financial opened a new position in Organon & Co (OGN) in Q2 2026: 2,810,019 shares worth $38M. The stake represents 0.35% of the portfolio and ranks #38 among its holdings. This is a return to the name: Magnetar Financial previously reported a position in OGN as recently as Q4 2024.

Magnetar Financial first reported a position in OGN in Q2 2021 and has held it in 11 quarters since. The position peaked at $38.1M in Q3 2023. 631 funds tracked by Wall St. Rank hold OGN as of Q2 2026.

Magnetar Financial held 2,810,019 shares of Organon & Co worth $38M as of Q2 2026.
Organon & Co was a new Magnetar Financial position in Q2 2026.
Organon & Co made up 0.35% of Magnetar Financial's portfolio in Q2 2026, its #38 holding.
Magnetar Financial first reported a position in Organon & Co in Q2 2021 and has held it in 11 quarters since.
Magnetar Financial's Organon & Co position peaked at $38.1M in Q3 2023.
631 funds tracked by Wall St. Rank held Organon & Co as of Q2 2026.

Based on Magnetar Financial's 13F filing for Q2 2026, filed 14 Aug 2026.