Allen & Overy (A&O) has topped Thomson Reuters’ EMEA debt capital markets rankings for the first quarter of the 2011 calendar year by manager, with US firm Sidley Austin topping the equivalent table by issuer.

A&O was the most active adviser to managers on international bond issues, advising underwriters on 129 deals generating proceeds of $92.8bn (£56bn). The tally gave the firm a 7% share of the market by volume, ahead of Linklaters, Clifford Chance (CC), Cahill Gordon & Reindel and Davis Polk & Wardwell.