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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
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 $5.72T AUM 30.48% 1-Year Est. Return
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $187B AUM 18.48% 1-Year Est. Return
PCM
Portolan Capital Management Boston, Massachusetts $1.88B AUM 115.74% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
SPPAM
Summit Partners Public Asset Management Boston, Massachusetts $3.72B AUM 162.29% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Allianz Asset Management
Allianz Asset Management Munich, Germany $95.4B AUM 38.74% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Magnetar Financial's CSTL Position: Q1 2026 in Review

Magnetar Financial opened a new position in Castle Biosciences (CSTL) in Q1 2026: 23,332 shares worth $573K. The stake represents 0.01% of the portfolio and ranks #600 among its holdings. This is a return to the name: Magnetar Financial previously reported a position in CSTL as recently as Q3 2025.

Magnetar Financial first reported a position in CSTL in Q1 2025 and has held it in 3 quarters since. 186 funds tracked by Wall St. Rank hold CSTL as of Q1 2026.

  • Magnetar Financial held 23,332 shares of Castle Biosciences worth $573K as of Q1 2026.
  • Castle Biosciences was a new Magnetar Financial position in Q1 2026.
  • Castle Biosciences made up 0.01% of Magnetar Financial's portfolio in Q1 2026, its #600 holding.
  • Magnetar Financial first reported a position in Castle Biosciences in Q1 2025 and has held it in 3 quarters since.
  • 186 funds tracked by Wall St. Rank held Castle Biosciences as of Q1 2026.

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