 PEMBROKE, Bermuda--BUSINESS WIRE--Arch Capital Group Ltd. NASDAQ: ACGL announces its 2021 second quarter results. The results included: Net income available to Arch common shareholders of 663.8 million, or 1.63 per share, a 21.2 annualized return on average common equity, compared to 288.4 million, or 0.71 per share, for the 2020 second quarter; After-tax operating income available to Arch common shareholders1 of 407.2 million, or 1.00 per share, a 13.0 annualized return on averag 