Company: CSTL
Filing Date: 2025-11-03
Form Type: 10-Q
Source: 0001628280-25-048254
Chunk: 119

Company: CASTLE BIOSCIENCES INC
Filing Date: 2025-11-03
Form: 10-Q
Item: Item 8
Chunk 119
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 consisted of the following (in thousands):September 30, 2025December 31, 2024Current marketable investment securities:Equity securities$8,907 $3,555 Debt securities - AFS187,495 169,866 Debt securities - HTM(1)5,584 — Total current marketable investment securities$201,986 $173,421 (1)We held no debt securities - HTM as of December 31, 2024.Equity SecuritiesWe recognized unrealized gains of $3.6 million and $3.3 million in our equity securities for the three and nine months ended September 30, 2025, respectively. No gains or losses were recognized for the three and nine months ended September 30, 2024, as we did not hold any equity securities during those periods.

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Table of ContentsCASTLE BIOSCIENCES, INC.NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)(UNAUDITED)

Debt SecuritiesThe following tables present our debt securities (in thousands):September 30, 2025Amortized CostUnrealizedEstimated Fair ValueGainsLossesU.S. government securities - AFS$187,255 $242 $(2)$187,495 U.S. government securities - HTM5,584 9 — 5,593 Total debt securities$192,839 $251 $(2)$193,088 December 31, 2024Amortized CostUnrealizedEstimated Fair ValueGainsLossesU.S. government securities - AFS$169,636 $244 $(14)$169,866 U.S. government securities - HTM(1)— — — — Total debt securities$169,636 $244 $(14)$169,866 (1)We held no debt securities - HTM as of December 31, 2024.Our U.S. government securities includes both AFS and HTM securities. The AFS securities are available to be sold to meet operating needs or otherwise, but are generally held through maturity. We classify all AFS investments as current assets, as these are readily available for use in current operations. We classify our HTM investments as current assets, as we have the positive intent and ability to hold these investments to maturity, and all such maturities are less than one year from the balance sheet date