Mastek's scrip jumped 13.57 per cent to Rs 207.90 -- its 52-week high on the BSE.
At the NSE, the stock soared 13.78 per cent to touch a one-year peak of Rs 208.
In just three trading sessions after the company announced the buyback plan, the scrip has gained 28.45 per cent.
In a communication to the stock exchanges on Friday, Mastek had said, "A meeting of the Board of Directors of the company will be held on January 8, 2014, to consider a proposal of buyback of equity shares."