Mumbai, July 18 -- Wipro Ltd shares rose 4% to Rs270 on Thursday, making it the biggest gainer among Nifty 50 stocks. The reasons for the increase in valuations are not to be found in the company's quarterly results, reported post markets hours on Wednesday. After all, revenues fell 0.7% sequentially in constant currency terms in the June quarter and growth in the September quarter is estimated to range between 0 and 2%....