Ross Stores Inc (NASDAQ:ROST) shares are trading higher in Thursday’s after-hours session after the company reported strong first-quarter results. Q1 Revenue: $4.858 billion, versus estimates of $4.833 billion Q1 EPS: $1.46, versus estimates of $1.34 Operating margin came in at 12.2% in the first quarter, up 205 basis points from last year’s first quarter, primarily driven by lower distribution, incentive and freight costs. Ross Stores noted that it repurchased 1.9 million shares for an aggregate of $262 million ...