The Sensex is trading in green after initial losses in the morning trade today. It was up by 53 points at 18497 a short while ago. The 30-share barometer, which rallied by over 823 points in the previous three sessions, declined by 148 points, to 18,298 points in the first few minutes of trade today.The wide-based National Stock Exchange Nifty index is up by 16 points at 5538.