Company: CSTL
Filing Date: 2025-08-04
Form Type: 10-Q
Source: 0001447362-25-000097
Chunk: 113

Company: CASTLE BIOSCIENCES INC
Filing Date: 2025-08-04
Form: 10-Q
Item: Item 8
Chunk 113
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4June 30, 2025December 31, 2024Medicare47 %48 %16 %18 %**Payor A15 %15 %17 %19 %16 %15 %Payor B**26 %20 %10 %12 %*    Less than 10%There were no other third-party payors that individually accounted for more than 10% of our total revenue or accounts receivable for the periods shown in the table above.

4. Earnings (Loss) Per Share

Basic earnings (loss) per share is computed by dividing net income (loss) for the period by the weighted-average number of common shares outstanding during the period. Diluted earnings (loss) per share reflects the additional dilution from potential issuances of common stock, such as stock issuable pursuant to the exercise of stock options, vesting of RSUs and PSUs or purchases under the ESPP. The treasury stock method is used to calculate the potential dilutive effect of these common stock equivalents. Contingently issuable PSU awards are included in the computation of diluted earnings (loss) per share when the applicable performance criteria would be met and the common shares would be issuable if the end of the reporting period were the end of the contingency period. However, potentially dilutive shares are excluded from the computation of diluted loss per share when their effect is antidilutive.

14

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

The following table shows the computation of basic and diluted earnings (loss) per share for the following three and six months ended June 30, 2025 and 2024 (in thousands, except per share data): Three Months EndedJune 30,Six Months EndedJune 30, 2025202420252024Numerator:Net income (loss)$4,523 $8,920 $(21,325)$6,386 Denominator:Weighted-average common shares outstanding, basic28,914 27,646 28,763 27,566 Assumed exercise of stock options361 440 — 441 Assumed vesting of RSUs186 546 — 427 Assumed vesting of PSUs84 98 — 98 Assumed issuance of shares under the ESPP— 8 — 10 Weighted-average