Ross Stores is trading 5.01% higher in pre-market at $241.63, with no clearly reported new announcement or overnight catalyst explaining the move. - UBS upgraded Ross Stores to Buy from Neutral on October 26, setting a $315 target based on expected productivity improvements under the new CEO; this was not a confirmed cause of the gain. - Broader market signals supplied are mixed and do not clearly account for the move. - No trading-volume or activity data was available to confirm unusually heavy participation.