The Bombay Stock Exchange benchmark Sensex on Wednesday opened 105 points high on emergence of foreign funds buying amid a firming Asian trend. The 30-share index, which lost 50.28 points in Tuesday's trading, gained 105.35 points to 17,983.49 points in the early morning trade. The wide-based National Stock Exchange's Nifty regained 5,400 points by rising 32.30 points, or 0.60 per cent to 5,400.30. Brokers said better trends on the other Asian bourses followed by overnight gains in the US stocks triggered buying by foreign funds as well as retail investors on the domestic market, helping the Sensex to recover. The Hong Kong's Hang Seng index was up by 0.57 per cent, while Japanese Nikkei by 1.11 per cent in morning trade. The US Dow Jones Industrial Average ended 0.74 per cent higher in Tuesday's trading.