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Rossby Financial’s Castle Biosciences CSTL Stock Holding History

Rossby 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 		$10.2K Hold
429
– – ﹤0.01% 1167
2026
Q1 		$10.7K Hold
429
– – ﹤0.01% 1226
2025
Q4 		$16.7K Buy
429
+47
+12% +$1.51K 0.01% 776
2025
Q3 		$8.79K Buy
382
+240
+169% +$4.88K ﹤0.01% 888
2025
Q2 		$2.9K Hold
142
– – ﹤0.01% 982
2025
Q1 		$2.93K Buy
+142
New +$3.52K ﹤0.01% 869

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

Rossby Financial's CSTL Position: Q2 2026 in Review

Rossby Financial held its Castle Biosciences (CSTL) position steady in Q2 2026 at 429 shares worth $10.2K. The position accounts for ﹤0.01% of the portfolio, ranked #1167.

Rossby Financial first reported a position in CSTL in Q1 2025 and has held it in 6 quarters since. The position peaked at $16.7K in Q4 2025. 177 funds tracked by Wall St. Rank hold CSTL as of Q2 2026.

  • Rossby Financial held 429 shares of Castle Biosciences worth $10.2K as of Q2 2026.
  • Rossby Financial left its Castle Biosciences share count unchanged in Q2 2026.
  • Castle Biosciences made up ﹤0.01% of Rossby Financial's portfolio in Q2 2026, its #1167 holding.
  • Rossby Financial first reported a position in Castle Biosciences in Q1 2025 and has held it in 6 quarters since.
  • Rossby Financial's Castle Biosciences position peaked at $16.7K in Q4 2025.
  • 177 funds tracked by Wall St. Rank held Castle Biosciences as of Q2 2026.

Based on Rossby Financial's 13F filing for Q2 2026, filed 4 Aug 2026.