XT
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XTX Topco’s Castle Biosciences CSTL Stock Holding History

XTX Topco’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 		$952K Buy
39,923
+19,640
+97% +$437K 0.01% 1836
2026
Q1 		$498K Sell
20,283
-1,842
-8% -$60.3K 0.01% 2059
2025
Q4 		$861K Buy
+22,125
New +$713K 0.02% 1138
2025
Q3 		– Sell
-46,301
Closed -$945K – 2685
2025
Q2 		$945K Buy
46,301
+26,673
+136% +$494K 0.04% 697
2025
Q1 		$393K Buy
+19,628
New +$486K 0.02% 1205
2024
Q3 		– Sell
-10,003
Closed -$218K – 2169
2024
Q2 		$218K Buy
+10,003
New +$223K 0.02% 1179
2024
Q1 		– Sell
-14,145
Closed -$305K – 1917
2023
Q4 		$305K Buy
+14,145
New +$249K 0.07% 602
2023
Q2 		– Sell
-16,254
Closed -$369K – 1480
2023
Q1 		$369K Buy
+16,254
New +$397K 0.08% 489

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

XTX Topco's CSTL Position: Q2 2026 in Review

XTX Topco increased its Castle Biosciences (CSTL) stake by 97% in Q2 2026, buying an estimated $437K and bringing the position to 39,923 shares worth $952K. The position accounts for 0.01% of the portfolio, ranked #1836.

XTX Topco first reported a position in CSTL in Q1 2023 and has held it in 8 quarters since. 176 funds tracked by Wall St. Rank hold CSTL as of Q2 2026.

  • XTX Topco held 39,923 shares of Castle Biosciences worth $952K as of Q2 2026.
  • XTX Topco bought 19,640 Castle Biosciences shares in Q2 2026, an estimated $437K.
  • Castle Biosciences made up 0.01% of XTX Topco's portfolio in Q2 2026, its #1836 holding.
  • XTX Topco first reported a position in Castle Biosciences in Q1 2023 and has held it in 8 quarters since.
  • 176 funds tracked by Wall St. Rank held Castle Biosciences as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.