8:30a Empire State index falls to -1 in May from 5.2 in April 8:30a May's negative reading in Empire State index is first since October 8:31a Gold adds to early gain after Empire State 8:31a June gold trades $6.80, or 0.6%, higher at $1,234.50/oz. 8:32a U.S. stock futures trim gains after Empire State data