W. R. Berkley Corporation
    Insider Ownership

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    Current Insider Ownership

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    Mitsui Sumitomo Insurance Co Ltd10% Owner
    Common Stock
    Mar 3, 2026
    58,780,450
    15.79
    3,905,960,903
    Ms&Ad Insurance Group Holdings, Inc.10% Owner
    Common Stock
    Mar 3, 2026
    58,780,450
    15.79
    3,905,960,903
    Berkley William RExecutive Chairman
    Common Stock
    Aug 15, 2025
    17,363,285
    4.66
    1,153,790,288

    Insider Trading Trends

    Insider Transactions

    Voluntary Buys vs Sells

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    Historical Insider Trading (3-Years)

    10b5-1

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    Ms&Ad Insurance Group Holdings, Inc.Common StockNoYesBuy
    ACQUIRE
    P
    		72.52+73,1855,307,65458,780,450Mar 3, 2026
    Mitsui Sumitomo Insurance Co LtdCommon StockNoYesBuy
    ACQUIRE
    P
    		71.60+38,9912,791,60458,707,265Mar 3, 2026
    Mitsui Sumitomo Insurance Co LtdCommon StockNoYesBuy
    ACQUIRE
    P
    		72.52+73,1855,307,65458,780,450Mar 3, 2026