Company: CSTL
Filing Date: 2025-05-05
Form Type: 10-Q
Source: 0001447362-25-000069
Chunk: 103

Company: CASTLE BIOSCIENCES INC
Filing Date: 2025-05-05
Form: 10-Q
Item: Item 8
Chunk 103
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 securities - AFS$183,200 $146 $(14)$183,332 U.S. government securities - HTM5,570 5 — 5,575 Total debt securities$188,770 $151 $(14)$188,907 December 31, 2024Amortized CostUnrealizedEstimated Fair ValueGainsLossesU.S. government securities - AFS$169,636 $244 $(14)$169,866 U.S. government securities - HTM— — — — Total debt securities$169,636 $244 $(14)$169,866 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 noncurrent assets, as we have the positive intent and ability to hold these investments to maturity, and all such maturities extend beyond one year from the balance sheet date.We evaluated our U.S. government securities under the AFS and HTM impairment model guidance, respectively, and determined our investment portfolio is comprised of low-risk, investment grade securities.As of March 31, 2025, unrealized losses on our AFS U.S. government securities are not attributed to credit risk. We believe that an allowance for credit losses is unnecessary because the unrealized losses on certain of our marketable investment securities are due to market factors. The allowance for credit losses was zero as of March 31, 2025 and December 31, 2024. As of March 31, 2025, all of our AFS debt securities had contractual maturities of one year or less.

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

There were no realized gains or losses on sales of debt securities for the three months ended March 31, 2025 and 2024. No credit-related or noncredit-related impairment losses were recorded for the three months ended March 31, 2025 and 2024.Accrued interest receivable for our AFS U.S. government securities is included in prepaid expenses and other current assets in our unaudited condensed consolidated balance sheets. The accrued interest receivable