SEI Investments
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SEI Investments’s Castle Biosciences CSTL Stock Holding History

SEI Investments’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 		$860K Sell
35,046
-4,681
-12% -$153K ﹤0.01% 2421
2025
Q4 		$1.55M Buy
39,727
+12,956
+48% +$418K ﹤0.01% 1986
2025
Q3 		$610K Sell
26,771
-4,359
-14% -$88.5K ﹤0.01% 2151
2025
Q2 		$636K Sell
31,130
-41,929
-57% -$776K ﹤0.01% 2085
2025
Q1 		$1.46M Buy
73,059
+31,568
+76% +$782K ﹤0.01% 1760
2024
Q4 		$1.11M Buy
41,491
+3,617
+10% +$110K ﹤0.01% 1902
2024
Q3 		$1.08M Buy
+37,874
New +$964K ﹤0.01% 1921
2023
Q3 		– Sell
-109,995
Closed -$1.51M – 2636
2023
Q2 		$1.51M Buy
109,995
+13,668
+14% +$277K ﹤0.01% 1737
2023
Q1 		$2.19M Buy
+96,327
New +$2.35M ﹤0.01% 1584
2022
Q4 		– Sell
-88,625
Closed -$2.31M – 2561
2022
Q3 		$2.31M Sell
88,625
-17,759
-17% -$498K 0.01% 1478
2022
Q2 		$2.33M Buy
+106,384
New +$2.47M 0.01% 1471
2021
Q4 		– Sell
-9,374
Closed -$624K – 2603
2021
Q3 		$624K Sell
9,374
-1,675
-15% -$118K ﹤0.01% 1970
2021
Q2 		$838K Sell
11,049
-852
-7% -$56.3K ﹤0.01% 1884
2021
Q1 		$816K Buy
11,901
+3,203
+37% +$241K ﹤0.01% 1839
2020
Q4 		$588K Sell
8,698
-8,373
-49% -$454K ﹤0.01% 1910
2020
Q3 		$879K Buy
17,071
+4,199
+33% +$187K ﹤0.01% 1654
2020
Q2 		$485K Sell
12,872
-3,694
-22% -$126K ﹤0.01% 1863
2020
Q1 		$494K Buy
16,566
+8,657
+109% +$261K ﹤0.01% 1743
2019
Q4 		$272K Buy
+7,909
New +$193K ﹤0.01% 2174

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

SEI Investments's CSTL Position: Q1 2026 in Review

SEI Investments reduced its Castle Biosciences (CSTL) stake by 12% in Q1 2026, selling an estimated $153K and leaving 35,046 shares worth $860K. The position accounts for ﹤0.01% of the portfolio, ranked #2421.

SEI Investments first reported a position in CSTL in Q4 2019 and has held it in 19 quarters since. The position peaked at $2.33M in Q2 2022. 186 funds tracked by Wall St. Rank hold CSTL as of Q1 2026.

  • SEI Investments held 35,046 shares of Castle Biosciences worth $860K as of Q1 2026.
  • SEI Investments sold 4,681 Castle Biosciences shares in Q1 2026, an estimated $153K.
  • Castle Biosciences made up ﹤0.01% of SEI Investments's portfolio in Q1 2026, its #2421 holding.
  • SEI Investments first reported a position in Castle Biosciences in Q4 2019 and has held it in 19 quarters since.
  • SEI Investments's Castle Biosciences position peaked at $2.33M in Q2 2022.
  • 186 funds tracked by Wall St. Rank held Castle Biosciences as of Q1 2026.

Based on SEI Investments's 13F filing for Q1 2026, filed 13 May 2026.