MF
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Magnetar Financial’s SEI Investments SEIC Stock Holding History

Magnetar Financial’s Portfolio SEIC Stock Details SEIC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-8,316
Closed -$682K – 1371
2025
Q4 		$682K Sell
8,316
-43,359
-84% -$3.56M 0.01% 498
2025
Q3 		$4.38M Buy
51,675
+38,601
+295% +$3.43M 0.03% 250
2025
Q2 		$1.17M Buy
+13,074
New +$1.05M 0.01% 407
2022
Q4 		– Sell
-44,723
Closed -$2.19M – 928
2022
Q3 		$2.19M Buy
44,723
+37,554
+524% +$2.05M 0.03% 565
2022
Q2 		$387K Buy
+7,169
New +$403K ﹤0.01% 1200
2021
Q2 		– Sell
-13,310
Closed -$811K – 1361
2021
Q1 		$811K Sell
13,310
-7,751
-37% -$454K 0.01% 728
2020
Q4 		$1.21M Buy
21,061
+10,869
+107% +$593K 0.02% 434
2020
Q3 		$517K Buy
+10,192
New +$539K 0.01% 436
2020
Q2 		– Sell
-23,571
Closed -$1.09M – 565
2020
Q1 		$1.09M Buy
+23,571
New +$1.4M 0.03% 169
2019
Q3 		– Sell
-9,110
Closed -$511K – 574
2019
Q2 		$511K Sell
9,110
-3,919
-30% -$211K 0.01% 296
2019
Q1 		$681K Sell
13,029
-821
-6% -$41.1K 0.02% 210
2018
Q4 		$640K Buy
+13,850
New +$730K 0.02% 141
2013
Q4 		– Sell
-53,078
Closed -$1.64M – 378
2013
Q3 		$1.64M Buy
53,078
+3,223
+6% +$99.3K 0.03% 225
2013
Q2 		$1.42M Buy
+49,855
New +$1.45M 0.03% 195

Other funds holding SEIC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Loomis, Sayles & Company
Loomis, Sayles & Company Boston, Massachusetts $79.8B AUM 16.05% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Lord, Abbett & Co
Lord, Abbett & Co Jersey City, New Jersey $34.9B AUM 72.7% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Magnetar Financial's SEIC Position: Q1 2026 in Review

Magnetar Financial sold out of SEI Investments (SEIC) in Q1 2026, closing a stake of 8,316 shares — an estimated $682K sold.

Magnetar Financial first reported a position in SEIC in Q2 2013 and held it in 14 quarters. The position peaked at $4.38M in Q3 2025. 568 funds tracked by Wall St. Rank hold SEIC as of Q1 2026.

  • Magnetar Financial reported no remaining SEI Investments position as of Q1 2026 after selling out during the quarter.
  • Magnetar Financial sold 8,316 SEI Investments shares in Q1 2026, an estimated $682K.
  • Magnetar Financial first reported a position in SEI Investments in Q2 2013 and held it in 14 quarters.
  • Magnetar Financial's SEI Investments position peaked at $4.38M in Q3 2025.
  • 568 funds tracked by Wall St. Rank held SEI Investments as of Q1 2026.

Based on Magnetar Financial's 13F filing for Q1 2026, filed 13 May 2026.