The private-banking unit of HSBC Holdings Plc made significant profits for years handling secret accounts whose holders included drug cartels, arms dealers, tax evaders and fugitive diamond merchants, according to a report released Sunday by an international news organization.

HSBC is among a handful of banks to face criminal prosecution in recent years for its role in a Swiss banking system that allowed depositors to conceal their identities, and in many cases dodge taxes or launder ill-gotten cash. The report, prepared by the Washington-based International Consortium of Investigative Journalists, revealed for the first time the massive sweep of HSBC’s private-banking arm as of 2007, when it controlled $100 billion in assets and served a swath of wealthy depositors from the elite to the illicit.

HSBC shares fell 2.2 percent to 607.10 pence at 2:23 p.m. in London, giving the bank a market value of 117 billion pounds ($178 billion).

The report is based on a list of HSBC clients from around that time that a onetime employee took from the bank and turned over to European officials, sparking tax investigations from Argentina to France, Belgium and Greece. While some of the list’s names have emerged before, Sunday’s report drew from a more comprehensive list of accounts associated with more than 100,000 people and legal entities from more than 200 nations, ranging from the legitimate to the illicit.

“These revelations confirm that banking secrecy has been used to avoid taxation,” Vanessa Mock, a European Union spokeswoman for tax affairs, said Monday.

‘Radical Transformation’

Depositors included royal families and convicted cocaine dealers, ambassadors and terror suspects, entertainers and elected officials, corporate executives and athletes. To these and other clients, the bank actively promoted its accounts as an efficient way to hide assets from tax collectors, according to the report.

HSBC, in a written response to the report, said its compliance efforts had been insufficient. It pointed out that the bank had undergone “a radical transformation” since 2007 and now enforced far more stringent reporting requirements.

Stephen Green, former chief executive officer and chairman of HSBC, told the BBC he won’t comment on the bank.

“HSBC has initiated numerous initiatives designed to ensure that its banking services are not used to evade taxes or launder money,” according to the statement. London-based HSBC operates in more than 70 countries and has a private-banking unit located in Geneva.

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