Investigations by the tax authorities into a leaked list of Maltese HSBC Geneva bank account holders were still under way, Prime Minister Joseph Muscat told parliament.
The Swiss Leaks data, published by the International Consortium of Investigative Journalists (ICIJ), revealed that over €600 million were held by Maltese account holders.
According to the Swiss Leaks, former Nationalist Cabinet ministers Ninu Zammit and Michael Falzon owned undeclared accounts.
It results that Mr Zammit had secreted away $3.2 million while Mr Falzon held €465,000 in his account. Both had benefitted from government tax amnesties.
Dr Muscat had promised in 2015 to publish the names of all politically-exposed persons on the Swiss Leaks list. Three years down the line, he has still to do so.
He repeatedly justified his failure to publish the list insisting investigations by the tax authorities were still under way.
The Swiss Leaks files also featured the name of former Enemalta chairman Tancred Tabone.
Leaked documents showed that HSBC had evaluated the potential of Mr Tabone’s Swiss account at over $10 million. Mr Tabone had set up a Jersey offshore trust into which he deposited $1 million, according to the HSBC data. He is facing corruption and money-laundering charges linked to his tenure as Enemalta’s chairman.
Petro-chemist Francis Sammut, businessmen Anthony Cassar and Francis Portelli also featured on the Swiss Leaks list.
Mr Sammut reportedly had $3.8 million to his name, Mr Cassar was linked to holdings of $2.1 million and Mr Portelli $1.9 million.
Mr Cassar and Mr Portelli deny any association with the funds.
In 2013, Mr Sammut was charged with taking kickbacks on Enemalta oil contracts while Mr Cassar and Mr Portelli were charged with corrupting Mr Sammut and Mr Tabone. They also face money laundering charges.
All four men deny the charges.
Dr Muscat had said at the time of the Swiss Leaks scandal that anyone holding a secret Swiss account would have to step down.
Leaked e-mails in the Panama Papers showed that his chief of staff, Keith Schembri, and Tourism Minister Konrad Mizzi tried to open bank accounts with the Panama branch of Swiss bank BSI.
Mr Schembri was reported to having owned a Swiss account, which he said was closed in 2011.