Investors punished Singapore Exchange Ltd., driving its stock down the most in two years, for agreeing to pay A$8.4 billion ($8.35 billion) for Australia’s main bourse. At the same time, Hong Kong Exchanges & Clearing Ltd., which manages Asia’s No. 3 stock market, climbed to the highest level since January 2008, and Bursa Malaysia Bhd. jumped the most since March. Full story