The Sensex that surged 481 points to regain the 16,000 mark in opening trade stood 473 points up at 16,265 in late Friday morning deals.All the sectoral indices were trading in the positive zone, with gains of up to 4.39 per cent on heavy buying by foreign funds. The Sensex had lost almost 905 points over the previous four sessions.In a similar fashion, the wide-based National Stock Exchange Nifty Index was trading 153 points in the green at 4,904.Meanwhile, in the Asian region, Hong Kong's Hang Seng Index rose by 2.01 per cent and Japan's Nikkei by 1.14 per cent in morning trade today. The Dow Jones Industrial Average ended 1.68 per cent higher in yesterday's trade.