Hinting towards a possible takeover of Satyam Computer, engineering major Larsen & Toubro on Friday raised its stake in the beleaguered IT firm to 12 per cent through open market share purchases. An L&T spokesperson said that the company purchased additional shares from the market taking its total holding from four per cent to 12 per cent. However, he declined to comment on whether it would further raise its stake in Satyam.