7. HDFC Bank-Centurion Bank of Punjab: $2.4 billion

HDFC Bank approved the acquisition of Centurion Bank of Punjab for Rs 9,510 crore ($2.4 billion) in one of the largest mergers in the financial sector in India in February, 2008.

CBoP shareholders got one share of HDFC Bank for every 29 shares held by them. Post-acquisition, HDFC Bank became the second-largest private sector bank in India.

The acquisition was also India's 7th largest ever.