Falling for the fourth straight session, the Sensex at the Bombay Stock Exchange ended with a marginal loss of 3 points, at 18,266, on weak global cues, today. The Sensex had lost over 220 points in the last three trading sessions. The Nifty at the National Stock Exchange fell 3 points, to 5,483. Stock markets in Japan, China, Hong Kong, South Korea and Singapore ended mixed.