Company: CSTL
Filing Date: 2025-08-04
Form Type: 10-Q
Source: 0001447362-25-000097
Chunk: 140

Company: CASTLE BIOSCIENCES INC
Filing Date: 2025-08-04
Form: 10-Q
Item: Item 8
Chunk 140
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 ongoing and future clinical studies and pipeline initiatives.

Selling, General and Administrative

Selling, general and administrative (“SG&A”) expenses include executive, selling and marketing, legal, finance and accounting, human resources and billing functions. These expenses consist of personnel costs (including salaries, bonuses, benefits and stock-based compensation expense), direct marketing expenses, audit and legal expenses, consulting costs, payor outreach programs and allocated overhead, including rent, information technology, equipment depreciation, and utilities. Other administrative and professional services expenses within SG&A are expected to increase with the scale of our business, but selling and marketing-related expenses are expected to increase significantly, consistent with our growth strategy.

Amortization of Acquired Intangible Assets

Amortization of acquired intangible assets is primarily associated with developed technology obtained through acquisitions, such as our acquisitions of the Myriad MyPath Laboratory in May 2021, Cernostics in December 2021, AltheaDx in April 2022, and Capsulomics, Inc., d/b/a Previse (“Capsulomics”) in May 2025.

Interest Income

Interest income consists primarily of earnings on cash and cash equivalents, primarily money market funds, and our short-term U.S. government obligations are a component of our marketable investment securities.

Change in Fair Value of Trading Securities

Change in fair value of trading securities is primarily attributable to unrealized gains and losses on our equity securities which we present as marketable investment securities.

Interest Expense

Interest expense is primarily attributable to long-term debt and finance leases.

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Income Tax Benefit

Income tax benefit is primarily due to the reduction of the valuation allowance previously recorded against our federal deferred tax assets. This reduction resulted in a credit to income tax expense and was based on new deferred tax liabilities recognized upon consolidating Capsulomics. Income tax expense consists primarily of income taxes related to federal and state jurisdictions in which we conduct business. We maintain a full valuation allowance for deferred tax assets including operating loss carryforwards and research and development credits and other tax credits. 

As of December 31, 2024, we had federal NOL carryforwards of $129.4 million, of which $52.9 million will begin to expire in 2031 if not utilized to offset federal taxable income, and $76.5 million may be carried forward indefinitely. Also, as of December 31, 2024, we also had state NOL carryforwards of $86.5 million, which begin to expire in