The stock climbed 4.26 per cent to Rs 473.85 on BSE.
On NSE, it rose by 4.2 per cent to Rs 473.80.
Blackstone India will acquire HP's 60.5 per cent stake in the company at Rs 430 per share, which will trigger an open offer for acquiring 26 per cent from other shareholders of Mphasis, for which it has announced a price of Rs 457.50 a share.
Announcement of the transaction after signing of a definitive agreement between the two parties ended speculation over the suitor for the IT exporter, which was put on the block by Hewlett Packard (HP) Enterprise.
