RF
CSTL icon

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
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 $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

Rossby Financial's CSTL Position: Q1 2026 in Review

Rossby Financial held its Castle Biosciences (CSTL) position steady in Q1 2026 at 429 shares worth $10.7K. The position accounts for ﹤0.01% of the portfolio, ranked #1226.

Rossby Financial first reported a position in CSTL in Q1 2025 and has held it in 5 quarters since. The position peaked at $16.7K in Q4 2025. 186 funds tracked by Wall St. Rank hold CSTL as of Q1 2026.

  • Rossby Financial held 429 shares of Castle Biosciences worth $10.7K as of Q1 2026.
  • Rossby Financial left its Castle Biosciences share count unchanged in Q1 2026.
  • Castle Biosciences made up ﹤0.01% of Rossby Financial's portfolio in Q1 2026, its #1226 holding.
  • Rossby Financial first reported a position in Castle Biosciences in Q1 2025 and has held it in 5 quarters since.
  • Rossby Financial's Castle Biosciences position peaked at $16.7K in Q4 2025.
  • 186 funds tracked by Wall St. Rank held Castle Biosciences as of Q1 2026.

Based on Rossby Financial's 13F filing for Q1 2026, filed 11 May 2026.