China bourses tighten rules on trading halts

China’s stock exchanges have capped the length of voluntary trading suspensions, in a move seen as the last obstacle to the inclusion of mainland shares in index provider MSCI’s global emerging-market benchmarks.  On Friday the Shanghai and Shenzhen bourses limited the length of stock-trading halts to three months if they are due to a “major asset restructuring" and one month for those related to private placements. It had not previously been clear how long companies could suspend…