NEW DELHI: Shares of Birla Precision (up 20 per cent), Vanta Bioscience (up 19.94 per cent), GTN Industries (up 19.71 per cent) and Picturehouse Media (up 19.43 per cent) surged up to 20 per cent on BSE on Tuesday.Stocks such as Avanti Feeds (up 16.10 per cent), Starlit Power Systems (up 14.89 per cent) and Celestial Biolabs (up 14.19 per cent) jumped up to 16 per cent.Indian equity benchmarks ended Tuesday's session on a flat note as gains in HDFC, Tata Consultancy Services, Maruti Suzuki and Infosys were offset by losses in Reliance Industries, Tata Motors, HDFC Bank and ICICI Bank.Investors restricted their bets ahead of the expiry of June series of options and derivatives contract on Thursday.Besides, a fresh rise in global crude oil prices and a precarious Indian rupee remained a concern.The BSE Sensex finished Tuesday's trade slightly up by 20 points, or 0.06 per cent, at 35,490, with 19 stocks in the green and 12 in the red.The NSE Nifty50 inched up by 7 points, or 0.06 per cent, to 10,769, with 26 stocks advancing and 24 declining.Coal India, Tata Consultancy Services, Maruti Suzuki and Asian Paints stood as the top gainers in the Sensex index.