W.R. Berkley Corporation (WRB) insider trading

{
  "status": "OK",
  "results": [
    {
      "tickers": [
        "BER",
        "WRB",
        "WRBpE",
        "WRBpF",
        "WRBpG",
        "WRBpH"
      ],
      "issuer_cik": "0000011544",
      "owner_cik": "0001431048",
      "accession_number": "0001193125-26-089411",
      "form_type": "4",
      "filing_date": "2026-03-03",
      "period_of_report": "2026-03-02",
      "issuer_name": "BERKLEY W R CORP",
      "issuer_trading_symbol": "WRB",
      "owner_name": "MS&AD Insurance Group Holdings, Inc.",
      "is_director": false,
      "is_officer": false,
      "is_ten_percent_owner": true,
      "is_other": false,
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": true,
      "transaction_date": "2026-03-02",
      "transaction_code": "P",
      "equity_swap_involved": false,
      "transaction_shares": 100897,
      "transaction_price_per_share": 73.198,
      "transaction_acquired_disposed": "A",
      "shares_owned_following_transaction": 58668274,
      "transaction_value": 7385458.606,
      "direct_or_indirect": "D",
      "footnotes": [
        {
          "id": "F1",
          "description": "The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025."
        },
        {
          "id": "F4",
          "description": "The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $72.71 to $73.415."
        },
        {
          "id": "F3",
          "description": "The shares are held directly by Mitsui Sumitomo Insurance Co., Ltd. (\"MSI\"). Because MSI is a wholly-owned subsidiary of MS&AD Insurance Group Holdings, Inc. (\"MS&AD\"), MS&AD may be deemed to beneficially own the reported securities. MS&AD expressly disclaims beneficial ownership of the reported securities, except to the extent of its pecuniary interest therein."
        }
      ],
      "remarks": "MSI, the Issuer and WR Berkley & Others LLC (\"WRBO\") are party to certain agreements described in, and filed as exhibits to, the Reporting Persons' Schedule 13D filed with the U.S. Securities and Exchange Commission on December 11, 2025. The Reporting Persons disclaim beneficial ownership of the securities of the Issuer owned by WRBO and disclaim that the Reporting Persons and WRBO constitute a \"group\" within the meaning of Rule 13d-5(b)(1) under the Securities Exchange Act of 1934, as amended."
    },
    {
      "tickers": [
        "BER",
        "WRB",
        "WRBpE",
        "WRBpF",
        "WRBpG",
        "WRBpH"
      ],
      "issuer_cik": "0000011544",
      "owner_cik": "0001142206",
      "accession_number": "0001193125-26-089411",
      "form_type": "4",
      "filing_date": "2026-03-03",
      "period_of_report": "2026-03-02",
      "issuer_name": "BERKLEY W R CORP",
      "issuer_trading_symbol": "WRB",
      "owner_name": "MITSUI SUMITOMO INSURANCE CO LTD",
      "is_director": false,
      "is_officer": false,
      "is_ten_percent_owner": true,
      "is_other": false,
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": true,
      "transaction_date": "2026-03-03",
      "transaction_code": "P",
      "equity_swap_involved": false,
      "transaction_shares": 38991,
      "transaction_price_per_share": 71.5961,
      "transaction_acquired_disposed": "A",
      "shares_owned_following_transaction": 58707265,
      "transaction_value": 2791603.5351000004,
      "direct_or_indirect": "D",
      "footnotes": [
        {
          "id": "F1",
          "description": "The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025."
        },
        {
          "id": "F5",
          "description": "The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $71.1095 to $71.9984."
        },
        {
          "id": "F3",
          "description": "The shares are held directly by Mitsui Sumitomo Insurance Co., Ltd. (\"MSI\"). Because MSI is a wholly-owned subsidiary of MS&AD Insurance Group Holdings, Inc. (\"MS&AD\"), MS&AD may be deemed to beneficially own the reported securities. MS&AD expressly disclaims beneficial ownership of the reported securities, except to the extent of its pecuniary interest therein."
        }
      ],
      "remarks": "MSI, the Issuer and WR Berkley & Others LLC (\"WRBO\") are party to certain agreements described in, and filed as exhibits to, the Reporting Persons' Schedule 13D filed with the U.S. Securities and Exchange Commission on December 11, 2025. The Reporting Persons disclaim beneficial ownership of the securities of the Issuer owned by WRBO and disclaim that the Reporting Persons and WRBO constitute a \"group\" within the meaning of Rule 13d-5(b)(1) under the Securities Exchange Act of 1934, as amended."
    }
  ]
}

// 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.