0000947484 2026-04-28 2026-04-28 0000947484 us-gaap:CommonStockMember 2026-04-28 2026-04-28 0000947484 acgl:SeriesFDepositaryShareEquivalentMember 2026-04-28 2026-04-28 0000947484 acgl:SeriesGDepositaryShareEquivalentMember 2026-04-28 2026-04-28 0000947484 false 8-K 2026-04-28 Arch Capital Group Ltd. D0 001-16209 98-0374481 Waterloo House, Ground Floor 100 Pitts Bay Road Pembroke HM 08 BM 441 278-9250 false false false false Common shares, $0.0011 par value per share ACGL NASDAQ Depositary shares, each representing a 1/1,000th interest in a 5.45% Series F preferred share ACGLO NASDAQ Depositary shares, each representing a 1/1,000th interest in a 4.55% Series G preferred share ACGLN NASDAQ false