MF
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Magnetar Financial’s Arch Capital ACGL Stock Holding History

Magnetar Financial’s Portfolio ACGL Stock Details ACGL Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q3 		– Sell
-25,246
Closed -$2.3M – 857
2025
Q2 		$2.3M Buy
+25,246
New +$2.33M 0.01% 330
2024
Q2 		– Sell
-27,887
Closed -$2.58M – 499
2024
Q1 		$2.58M Buy
27,887
+3,487
+14% +$295K 0.06% 188
2023
Q4 		$1.81M Buy
+24,400
New +$1.99M 0.05% 212
2021
Q4 		– Sell
-34,322
Closed -$1.31M – 1351
2021
Q3 		$1.31M Buy
+34,322
New +$1.36M 0.01% 672
2021
Q2 		– Sell
-45,760
Closed -$1.76M – 1176
2021
Q1 		$1.76M Buy
+45,760
New +$1.63M 0.02% 598
2020
Q2 		– Sell
-20,742
Closed -$590K – 421
2020
Q1 		$590K Buy
20,742
+5,478
+36% +$222K 0.01% 257
2019
Q4 		$655K Buy
+15,264
New +$633K 0.01% 262
2018
Q4 		– Sell
-13,570
Closed -$405K – 274
2018
Q3 		$405K Buy
+13,570
New +$404K 0.01% 237
2018
Q2 		– Sell
-450,597
Closed -$12.9M – 486
2018
Q1 		$12.9M Buy
450,597
+401,331
+815% +$11.8M 0.22% 49
2017
Q4 		$1.49M Buy
+49,266
New +$1.58M 0.03% 151
2017
Q3 		– Sell
-76,758
Closed -$2.39M – 705
2017
Q2 		$2.39M Buy
+76,758
New +$2.43M 0.04% 214

Other funds holding ACGL

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return
BAMCO Inc
BAMCO Inc New York $66.6B AUM 7.35% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
WCM Investment Management
WCM Investment Management Laguna Beach, California $55.2B AUM 57.07% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $860B AUM 41.15% 1-Year Est. Return

Magnetar Financial's ACGL Position: Q3 2025 in Review

Magnetar Financial sold out of Arch Capital (ACGL) in Q3 2025, closing a stake of 25,246 shares — an estimated $2.3M sold.

Magnetar Financial first reported a position in ACGL in Q2 2017 and held it in 11 quarters. The position peaked at $12.9M in Q1 2018. 844 funds tracked by Wall St. Rank hold ACGL as of Q3 2025.

  • Magnetar Financial reported no remaining Arch Capital position as of Q3 2025 after selling out during the quarter.
  • Magnetar Financial sold 25,246 Arch Capital shares in Q3 2025, an estimated $2.3M.
  • Magnetar Financial first reported a position in Arch Capital in Q2 2017 and held it in 11 quarters.
  • Magnetar Financial's Arch Capital position peaked at $12.9M in Q1 2018.
  • 844 funds tracked by Wall St. Rank held Arch Capital as of Q3 2025.

Based on Magnetar Financial's 13F filing for Q3 2025, filed 13 Nov 2025.