Simplex Trading
CSTL icon

Simplex Trading’s Castle Biosciences CSTL Stock Holding History

Simplex Trading’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
2025
Q4 		– Sell
-1,512
Closed -$48.7K – 8800
2025
Q3 		$34K Buy
+1,512
New +$30.7K ﹤0.01% 6836
2025
Q2 		– Sell
-97
Closed -$1.8K – 8799
2025
Q1 		$1K Sell
97
-2,967
-97% -$73.5K ﹤0.01% 8177
2024
Q4 		$81K Sell
3,064
-8,940
-74% -$272K ﹤0.01% 5376
2024
Q3 		$342K Buy
+12,004
New +$306K ﹤0.01% 3996
2024
Q2 		– Sell
-6
Closed -$134 – 8930
2024
Q1 		$0 Buy
+6
New +$131 ﹤0.01% 8987
2023
Q4 		– Sell
-260
Closed -$4.58K – 8927
2023
Q3 		$4K Buy
+260
New +$4.55K ﹤0.01% 7740
2023
Q2 		– Sell
-3,138
Closed -$63.6K – 9113
2023
Q1 		$71K Buy
+3,138
New +$76.7K ﹤0.01% 5521
2022
Q4 		– Sell
-8,968
Closed -$208K – 9365
2022
Q3 		$233K Buy
8,968
+8,022
+848% +$225K ﹤0.01% 4411
2022
Q2 		$20K Buy
+946
New +$22K ﹤0.01% 7600
2022
Q1 		– Sell
-177
Closed -$7.31K – 10526
2021
Q4 		$7K Sell
177
-1,443
-89% -$75.4K ﹤0.01% 9282
2021
Q3 		$115K Hold
1,620
– – ﹤0.01% 6420
2021
Q2 		$118K Buy
+1,620
New +$107K ﹤0.01% 6485
2020
Q4 		– Sell
-138
Closed -$7.48K – 8435
2020
Q3 		$7K Sell
138
-10
-7% -$445 ﹤0.01% 6945
2020
Q2 		$5K Buy
+148
New +$5.06K ﹤0.01% 6958

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

Simplex Trading's CSTL Position: Q4 2025 in Review

Simplex Trading sold out of Castle Biosciences (CSTL) in Q4 2025, closing a stake of 1,512 shares — an estimated $48.7K sold.

Simplex Trading first reported a position in CSTL in Q2 2020 and held it in 14 quarters. The position peaked at $342K in Q3 2024. 194 funds tracked by Wall St. Rank hold CSTL as of Q4 2025.

  • Simplex Trading reported no remaining Castle Biosciences position as of Q4 2025 after selling out during the quarter.
  • Simplex Trading sold 1,512 Castle Biosciences shares in Q4 2025, an estimated $48.7K.
  • Simplex Trading first reported a position in Castle Biosciences in Q2 2020 and held it in 14 quarters.
  • Simplex Trading's Castle Biosciences position peaked at $342K in Q3 2024.
  • 194 funds tracked by Wall St. Rank held Castle Biosciences as of Q4 2025.

Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.