Overnight trading technology could one day mean the trading day never ends

Open this photo in gallery: Visitors look at an electronic stock board at Tokyo Stock Exchange on Aug. 18, in Tokyo, Japan.Shuji Kajiyama/The Associated Press Some day in the future, the bell signifying the beginning and end of equity trading will ring for the final time, as markets will simply stay open indefinitely. Based on the rapid growth of Blue Ocean Technologies LLC, a Canadian-backed U.S. fintech startup focused on overnight trading, that day could be coming soon. "It used to be that trading didn't start until 10 a.m. because most of us didn't get over our hangovers until around…