The move, part of an ongoing £10m ($14.1m, €12.4m) investigation being carried out with HM Revenue & Customs, the National Crime Agency and the Serious Fraud Office, was announced by the regulator’s acting chief executive Tracy McDermott on Tuesday
Speaking at a Treasury select committee hearing, she said the FCA had written to a “second tranche” of firms asking them to clarify any connections to the scandal on top of the 20 it had originally asked.
Panama Papers leak
On 3 April, more than 11 million documents were leaked from Panamanian law firm Mossack Fonseca, exposing how institutions, politicians and public officials around the world use offshore companies to avoid paying tax.
Days later, the FCA sent out letters to 20 businesses giving them a deadline of 15 April in which to carry out their own inquiries into potential ties to the scandal.
Meanwhile, HMRC is already investigating 700 leads linked to Panama.
During the hearing, McDermott told MPs that it was “far too early” to discuss the preliminary findings of the investigation, adding that “there’s nothing necessarily illegal about having offshore arrangements; it’s all about their purpose”.
She said that without full access to the leaked documents “the challenge at the moment is actually knowing where the tip of the iceberg is”.
The documents - which were apparently leaked by an anonymous source to German newspaper Süddeutsche Zeitung - were then passed on to the International Consortium of Investigative Journalists (ICIJ), the BBC and the Guardian.