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Harbour Investments’s Castle Biosciences CSTL Stock Holding History

Harbour 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 		$79.7K Buy
3,248
+111
+4% +$3.64K ﹤0.01% 2076
2025
Q4 		$122K Hold
3,137
– – ﹤0.01% 1535
2025
Q3 		$71.4K Buy
3,137
+150
+5% +$3.05K ﹤0.01% 1724
2025
Q2 		$61K Buy
2,987
+487
+19% +$9.02K ﹤0.01% 1716
2025
Q1 		$50K Buy
+2,500
New +$61.9K ﹤0.01% 1762
2024
Q3 		– Sell
-2,270
Closed -$49.4K – 3416
2024
Q2 		$49.4K Buy
+2,270
New +$50.6K ﹤0.01% 1554
2021
Q4 		– Sell
-950
Closed -$63K – 2842
2021
Q3 		$63K Hold
950
– – ﹤0.01% 1628
2021
Q2 		$70K Hold
950
– – ﹤0.01% 1601
2021
Q1 		$65K Buy
+950
New +$71.4K ﹤0.01% 1518

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

Harbour Investments's CSTL Position: Q1 2026 in Review

Harbour Investments increased its Castle Biosciences (CSTL) stake by 3.5% in Q1 2026, buying an estimated $3.64K and bringing the position to 3,248 shares worth $79.7K. The position accounts for ﹤0.01% of the portfolio, ranked #2076.

Harbour Investments first reported a position in CSTL in Q1 2021 and has held it in 9 quarters since. The position peaked at $122K in Q4 2025. 186 funds tracked by Wall St. Rank hold CSTL as of Q1 2026.

  • Harbour Investments held 3,248 shares of Castle Biosciences worth $79.7K as of Q1 2026.
  • Harbour Investments bought 111 Castle Biosciences shares in Q1 2026, an estimated $3.64K.
  • Castle Biosciences made up ﹤0.01% of Harbour Investments's portfolio in Q1 2026, its #2076 holding.
  • Harbour Investments first reported a position in Castle Biosciences in Q1 2021 and has held it in 9 quarters since.
  • Harbour Investments's Castle Biosciences position peaked at $122K in Q4 2025.
  • 186 funds tracked by Wall St. Rank held Castle Biosciences as of Q1 2026.

Based on Harbour Investments's 13F filing for Q1 2026, filed 15 May 2026.