Group One Trading
CSTL icon

Group One Trading’s Castle Biosciences CSTL Stock Holding History

Group One 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
2026
Q1 		$130K Buy
+5,300
New +$174K ﹤0.01% 4483
2025
Q2 		– Sell
-500
Closed -$10K – 8022
2025
Q1 		$10K Sell
500
-600
-55% -$14.9K ﹤0.01% 6262
2024
Q4 		$29.3K Buy
1,100
+900
+450% +$27.4K ﹤0.01% 5447
2024
Q3 		$5.7K Buy
+200
New +$5.09K ﹤0.01% 5827

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

Group One Trading's CSTL Position: Q1 2026 in Review

Group One Trading opened a new position in Castle Biosciences (CSTL) in Q1 2026: 292 shares worth $7.17K. The stake represents ﹤0.01% of the portfolio and ranks #6546 among its holdings. This is a return to the name: Group One Trading previously reported a position in CSTL as recently as Q3 2025.

Group One Trading first reported a position in CSTL in Q3 2021 and has held it in 9 quarters since. The position peaked at $261K in Q4 2024. 186 funds tracked by Wall St. Rank hold CSTL as of Q1 2026.

  • Group One Trading held 292 shares of Castle Biosciences worth $7.17K as of Q1 2026.
  • Castle Biosciences was a new Group One Trading position in Q1 2026.
  • Castle Biosciences made up ﹤0.01% of Group One Trading's portfolio in Q1 2026, its #6546 holding.
  • Group One Trading first reported a position in Castle Biosciences in Q3 2021 and has held it in 9 quarters since.
  • Group One Trading's Castle Biosciences position peaked at $261K in Q4 2024.
  • 186 funds tracked by Wall St. Rank held Castle Biosciences as of Q1 2026.

Based on Group One Trading's 13F filing for Q1 2026, filed 13 May 2026.