US firm sues Mu Sigma for painting dim picture to buy back shares cheap 0 10.03.2016 23:58 «The Times of India» (indiatimes.com) Bengaluru-based data analytics firm Mu Sigma has been slapped with a lawsuit by a US investor who has alleged that founder Dhiraj Rajaram wrongly painted a dim picture of the company in order to buy back the investor's shares at a low value.