Tech Mahindra stock could see a renewed buying this week as the Reserve Bank enhanced the limit for foreign institutional investors to invest up to 45 per cent of the paid-up capital of the company. This limit has been revised from the earlier limit of 35 per cent of the paid-up capital of the company under the Portfolio Investment Scheme. FII, at the end of September, controls 32.59 per cent stake in the company while promoters holding stands at 36.46 per cent. At the end of September 2012, foreign investors had 15.12 per cent stake in the company. On Friday, Tech Mahindra closed at Rs 1,548.60, up 2.21 per cent over the previous day.