# EDGAR Filing Document

**Accession Number:** 0001447362
**File Stem:** 0001628280-26-024168
**Filing Date:** 2026-4
**Character Count:** 1222
**Document Hash:** e9ed3d9fe6ca530fb94e512eeec5ee1d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-26-024168.hdr.sgml**: 20260408

**ACCESSION NUMBER**: 0001628280-26-024168

**CONFORMED SUBMISSION TYPE**: ARS

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260408

**DATE AS OF CHANGE**: 20260408

**EFFECTIVENESS DATE**: 20260408

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** CASTLE BIOSCIENCES INC
- **CENTRAL INDEX KEY:** 0001447362
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-MEDICAL LABORATORIES [8071]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 770701774
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** ARS
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38984
- **FILM NUMBER:** 26846862

**BUSINESS ADDRESS:**
- **STREET 1:** 1500 W. PARKWOOD AVE.
- **STREET 2:** SUITE 400
- **CITY:** FRIENDSWOOD
- **STATE:** TX
- **ZIP:** 77546
- **BUSINESS PHONE:** 866-788-9007

**MAIL ADDRESS:**
- **STREET 1:** 1500 W. PARKWOOD AVE.
- **STREET 2:** SUITE 400
- **CITY:** FRIENDSWOOD
- **STATE:** TX
- **ZIP:** 77546

### Attached PDF Documents

**Attachment 1:** `castlebiosciencesinc_2025a.pdf`

_No text found in this document._