A vague mention of Amazon.com Inc.’s interest in any sector might be enough to send investors into a tizzy, but the top executive of U.S. Xpress Enterprises Inc. is unfazed.

Industrial stocks were poised for a rally April 27 after solid earnings reports from UPS Inc. and Raytheon Co., and a reversal of the defense and aerospace selloff that puzzled investors earlier this week. But transports are having none of that.

Tesla Inc.’s superstar chief executive Elon Musk unveiled a futuristic looking electric semi truck last week that surpassed analyst expectations and weighed heavily on the shares of truck and truck component makers.