The stock zoomed 18.27 per cent to Rs 22.65 at the BSE.
On the NSE, it climbed 18.75 per cent to Rs 22.80.
Dilip Shanghvi is the Sun Pharmaceuticals promoter.
The company has signed definitive agreements with Dilip Shanghvi Family and Associates (DSA) for equity investments of Rs 1,800 crore in Suzlon Energy.
Post allotment, DSA shareholding will rise to 23 per cent (based on current shareholding), while the Tanti Family will hold 24 per cent shares.
Management control will remain with Tanti family by virtue of pooling arrangement for voting.