Castle Biosciences, Inc. (CSTL) insider trading

{
  "status": "OK",
  "results": [
    {
      "tickers": [
        "CSTL"
      ],
      "issuer_cik": "0001447362",
      "owner_cik": "0001239501",
      "accession_number": "0001628280-26-066724",
      "form_type": "4",
      "filing_date": "2026-10-21",
      "period_of_report": "2026-10-19",
      "issuer_name": "CASTLE BIOSCIENCES INC",
      "issuer_trading_symbol": "CSTL",
      "owner_name": "MAETZOLD DEREK J",
      "is_director": true,
      "is_officer": true,
      "is_ten_percent_owner": false,
      "is_other": false,
      "officer_title": "Pres. & Chief Exec. Officer",
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": true,
      "transaction_date": "2026-10-19",
      "transaction_code": "S",
      "equity_swap_involved": false,
      "transaction_shares": 8580,
      "transaction_price_per_share": 31.91,
      "transaction_acquired_disposed": "D",
      "shares_owned_following_transaction": 12484,
      "transaction_value": 273787.8,
      "not_subject_to_section_16": false,
      "direct_or_indirect": "D",
      "footnotes": [
        {
          "id": "F1",
          "description": "These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on June 2, 2026."
        },
        {
          "id": "F2",
          "description": "This transaction was executed in multiple trades at prices ranging from $31.67 to $32.53, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."
        }
      ]
    },
    {
      "tickers": [
        "CSTL"
      ],
      "issuer_cik": "0001447362",
      "owner_cik": "0001239501",
      "accession_number": "0001628280-26-066724",
      "form_type": "4",
      "filing_date": "2026-10-21",
      "period_of_report": "2026-10-19",
      "issuer_name": "CASTLE BIOSCIENCES INC",
      "issuer_trading_symbol": "CSTL",
      "owner_name": "MAETZOLD DEREK J",
      "is_director": true,
      "is_officer": true,
      "is_ten_percent_owner": false,
      "is_other": false,
      "officer_title": "Pres. & Chief Exec. Officer",
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": true,
      "transaction_date": "2026-10-19",
      "transaction_code": "S",
      "equity_swap_involved": false,
      "transaction_shares": 3198,
      "transaction_price_per_share": 31.91,
      "transaction_acquired_disposed": "D",
      "shares_owned_following_transaction": 4840,
      "transaction_value": 102048.18000000001,
      "not_subject_to_section_16": false,
      "direct_or_indirect": "I",
      "nature_of_ownership": "By The Maetzold Descendants 2020 Trust",
      "footnotes": [
        {
          "id": "F1",
          "description": "These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on June 2, 2026."
        },
        {
          "id": "F2",
          "description": "This transaction was executed in multiple trades at prices ranging from $31.67 to $32.53, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."
        },
        {
          "id": "F3",
          "description": "Held by The Maetzold Descendants 2020 Trust of which the Reporting Person's spouse is the trustee and the Reporting Person's spouse and their children are beneficiaries."
        }
      ]
    }
  ]
}

// trimmed to 2 results

The response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.