Citigroup has held its crown as top bookrunner of debt capital markets deals worldwide, despite run-ins with regulators over a series of controversial European government bond and futures trades.

The US financial giant worked on deals worth a total of $111.1bn (€86bn) in the first three months of this year, giving it an 8.2% share of the global debt market, according to preliminary figures from Dealogic, the investment banking data provider.