Mumbai, May 19 -- Tech Mahindra Ltd gained for a third straight session today. The stock is quoting at Rs 1481.6, up 3.61% on the day as on 12:49 IST on the NSE. The benchmark NIFTY is up around 0.33% on the day, quoting at 23727.6. The Sensex is at 75577.8, up 0.35%. Tech Mahindra Ltd has slipped around 1.52% in last one month. Meanwhile, Nifty IT index of which Tech Mahindra Ltd is a constituent, has slipped around 7.11% in last one month and is currently quoting at 28389.8, up 3.35% on the day. The volume in the stock stood at 53.35 lakh shares today, compared to the daily average of 28.51 lakh shares in last one month. The benchmark May futures contract for the stock is quoting at Rs 1471.3, up 2.93% on the day. Tech Mahindra Ltd is d...