The Nikkei 225 Stock Average retreated from an intraday high, after closing Monday at its highest since 1991. Stocks in Hong Kong underperformed as traders returned from a long weekend, and equities also fell in Australia and South Korea. China’s markets are shut throughout the week. Earlier, the S&P 500 Index finished higher, though more stocks fell than rose in the benchmark index. The pound rose following a report the U.K. is planning a compromise on Irish border rules, before pulling back.