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Magnetar Financial’s Castle Biosciences CSTL Stock Holding History

Magnetar Financial’s Portfolio CSTL Stock Details CSTL Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		– Sell
-23,332
Closed -$573K – 1225
2026
Q1 		$573K Buy
+23,332
New +$764K 0.01% 600
2025
Q4 		– Sell
-10,327
Closed -$235K – 983
2025
Q3 		$235K Buy
+10,327
New +$210K ﹤0.01% 741
2025
Q2 		– Sell
-11,226
Closed -$225K – 940
2025
Q1 		$225K Buy
+11,226
New +$278K ﹤0.01% 645

Other funds holding CSTL

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
RI
RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
Allianz Asset Management
Allianz Asset Management Munich, Germany $123B AUM 45.23% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
SPPAM
Summit Partners Public Asset Management Boston, Massachusetts $5.69B AUM 259.25% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Magnetar Financial's CSTL Position: Q2 2026 in Review

Magnetar Financial sold out of Castle Biosciences (CSTL) in Q2 2026, closing a stake of 23,332 shares — an estimated $573K sold.

Magnetar Financial first reported a position in CSTL in Q1 2025 and held it in 3 quarters. The position peaked at $573K in Q1 2026. 177 funds tracked by Wall St. Rank hold CSTL as of Q2 2026.

  • Magnetar Financial reported no remaining Castle Biosciences position as of Q2 2026 after selling out during the quarter.
  • Magnetar Financial sold 23,332 Castle Biosciences shares in Q2 2026, an estimated $573K.
  • Magnetar Financial first reported a position in Castle Biosciences in Q1 2025 and held it in 3 quarters.
  • Magnetar Financial's Castle Biosciences position peaked at $573K in Q1 2026.
  • 177 funds tracked by Wall St. Rank held Castle Biosciences as of Q2 2026.

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