Credit Suisse First Boston has won a double role in the creation of the world's biggest steel company by Lakshmi Mittal, one of the UK's wealthiest men.

In a two-step deal, CSFB advised the board of Ispat International, the Amsterdam and New York-listed steel company, on its $13.3bn (€10.4bn) reverse takeover of LNM Holdings. It also advised Ispat on its $4.5bn acquisition of International Steel Group, the US steel company.