Navistar shares slump on first-quarter loss

By Siri Bulusu Navistar International Corp. shares tumbled after the company, citing “softer industry conditions” and lower export sales, reported a substantial first-quarter loss. The commercial and military truck manufacturer disclosed a net loss of $33 million, or 40 cents per diluted share, a narrower deficit than the year-ago quarter’s $42 million, or 52 cents […]