In a surprise announcement in April, Sun and Ranbaxy -- at that time owned by Japan's Daiichi -- declared an all-stock deal to create India's largest and world's fifth-largest drugmaker in an over $4 billion deal.
The 30-share Sensex lost 22 points to close at 27,090 and the 50-share Nifty gained 7 points to end at 8,121.