W. R. Berkley Director Marie Mattson Receives 3,090 Stock Awards

This Form 4 filing reports that Marie Angela Mattson, a director of W. R. Berkley Corporation, received 3,090 shares of common stock as an award under the company's 2009 Directors Stock Plan. The transaction occurred on June 3, 2026, with the shares acquired at $0 per share, indicating they were granted as compensation rather than purchased. Following this transaction, Mattson now holds a total of 9,667 shares of W. R. Berkley Corporation common stock. The filing notes that the award was granted pursuant to the terms of the W. R. Berkley Corporation 2009 Directors Stock Plan, as amended and restated. The filing was signed by Marie A. Mattson on June 4, 2026, and reports her ownership as direct (D) rather than indirect.