The Sensex is trading up by 238 points to 20,850 when reports last came on emergence of buying by funds and retail investors.The wide-based National Stock Exchange index Nifty moved up by 75 points to 6,215.In the Asian region, Japan's Nikkei rose by 1.54 per cent, while Hong Kong's Hang Seng index gained 0.61 per cent in early trade.