Company: CSTL
Filing Date: 2025-08-04
Form Type: 10-Q
Source: 0001447362-25-000097
Chunk: 18

Company: CASTLE BIOSCIENCES INC
Filing Date: 2025-08-04
Form: 10-Q
Item: Item 1
Chunk 18
---
 performance will be above or below target (in thousands): Three Months EndedJune 30,Six Months EndedJune 30,2025202420252024Stock options2,466 2,487 2,965 2,493 RSUs and PSUs2,958 892 4,053 877 ESPP123 216 150 233 Total5,547 3,595 7,168 3,603 

15

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

5. Marketable Investment Securities 

Marketable investment securities consisted of the following (in thousands):June 30, 2025December 31, 2024Current marketable investment securities:Trading securities$3,315 $3,555 Debt securities - AFS184,805 169,866 Debt securities - HTM(1)5,577 — Total current marketable investment securities$193,697 $173,421 (1)  We held no debt securities - HTM as of December 31, 2024.Trading securitiesWe recognized unrealized gains of $1.2 million and unrealized losses of $0.2 million in our trading securities for the three and six months ended June 30, 2025, respectively. No gains or losses were recognized for the three and six months ended June 30, 2024, as we did not hold any trading securities during those periods.Debt securitiesThe following tables present our debt securities (in thousands):June 30, 2025Amortized CostUnrealizedEstimated Fair ValueGainsLossesU.S. government securities - AFS$184,766 $58 $(19)$184,805 U.S. government securities - HTM5,577 2 — 5,579 Total debt securities$190,343 $60 $(19)$190,384 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