Allen & Overy (A&O) has won Raiffeisen International Bank-Holding as a new client after advising the group on the largest IPO in the history of the Vienna Stock Exchange.

Led by London-based US partner Thomas Werlen, the A&O team landed the mandate to advise Raiffeisen on its €1.11bn (£750m) listing after a beauty parade involving a number of City and US firms.

A&O has developed a strong track record in Austria, having advised on a number of major capital market deals over the last 12 months, including acting for VA Technologie on its €907m (£616.3m) sale to Siemens.

Merrill Lynch and Raiffeisen Centrobank, the joint global bookrunners and joint lead managers, were advised by Davis Polk & Wardwell.