Wellington Management Group
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Wellington Management Group’s Castle Biosciences CSTL Stock Holding History

Wellington Management Group’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 		– Sell
-218,560
Closed -$8.5M – 1900
2025
Q4 		$8.5M Buy
+218,560
New +$7.05M ﹤0.01% 1289
2025
Q3 		– Sell
-407,211
Closed -$8.32M – 2000
2025
Q2 		$8.32M Sell
407,211
-421,317
-51% -$7.8M ﹤0.01% 1256
2025
Q1 		$16.6M Buy
828,528
+106,408
+15% +$2.63M ﹤0.01% 1030
2024
Q4 		$19.2M Buy
+722,120
New +$22M ﹤0.01% 984

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

Wellington Management Group's CSTL Position: Q1 2026 in Review

Wellington Management Group sold out of Castle Biosciences (CSTL) in Q1 2026, closing a stake of 218,560 shares — an estimated $8.5M sold.

Wellington Management Group first reported a position in CSTL in Q4 2024 and held it in 4 quarters. The position peaked at $19.2M in Q4 2024. 186 funds tracked by Wall St. Rank hold CSTL as of Q1 2026.

  • Wellington Management Group reported no remaining Castle Biosciences position as of Q1 2026 after selling out during the quarter.
  • Wellington Management Group sold 218,560 Castle Biosciences shares in Q1 2026, an estimated $8.5M.
  • Wellington Management Group first reported a position in Castle Biosciences in Q4 2024 and held it in 4 quarters.
  • Wellington Management Group's Castle Biosciences position peaked at $19.2M in Q4 2024.
  • 186 funds tracked by Wall St. Rank held Castle Biosciences as of Q1 2026.

Based on Wellington Management Group's 13F filing for Q1 2026, filed 15 May 2026.