The Adani Group has overtaken Mukesh Ambani Group to become the country's second biggest business group in terms of market cap behind Tatas. Adani Group Cos now have a combined Mkt Cap of Rs 19.44 trillion against Ambani Group Cos combined Mcap of Rs 17.89 trillion. Tata Group leads the league table with the group market capitalisation of Rs 21.73 trillion on Monday.