3. Hindalco-Novelis: $6 billion

Aluminium and copper major Hindalco Industries, the Kumar Mangalam Birla-led Aditya Birla Group flagship, acquired Canadian company Novelis Inc in a $6-billion, all-cash deal in February 2007.

Till date, it is India's third-largest M&A deal.

The acquisition would make Hindalco the global leader in aluminium rolled products and one of the largest aluminium producers in Asia. With post-acquisition combined revenues in excess of $10 billion, Hindalco would enter the Fortune-500 listing of world's largest companies by sales revenues.