Martin Wheatley, chief executive of the Financial Conduct Authority (FCA), said it did not know about the claims regarding the London-based bank's Swiss division before they emerged in a cache of secret files published this weekend.
HM Revenue and Customs, Britain's tax authority, was passed information about 3,600 UK businesses and individuals in 2010 and recouped more than USD 206 million.
But Wheatley told parliament's Treasury committee: "We didn't have the specific allegations as far as I'm aware from HMRC on this particular incident."
HMRC chief executive Lin Homer later said that when it was passed files by the French authorities on HSBC's Swiss dealings in 2010, it was prohibited from sharing the information.
"HMRC received the HSBC data under very strict conditions, which limited our use of it to pursuing offshore tax evasion and prevented us from sharing the data with other law enforcement authorities," she said.
"Under these restrictions, we have not been able to seek prosecution for other potential offences, such as money laundering."
She said tax officials had also contacted the investigative journalists behind the leaks for more information.
The latest allegations sparked a political row over why Britain did not act sooner.
HMRC said it had flagged to prosecutors three potential criminal cases in the files but that only one of these led to a prosecution.
A spokeswoman for Prime Minister David Cameron said Tuesday that ministers had also been kept in the dark about the HMRC investigation.
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