Quattrone (right) may go to prison for more than a year

The jury concluded the former CSFB banker tried to block investigations in 2000 when he sent an e-mail urging colleagues to "clean-up" their files.

Quattrone, 48, was found guilty of two counts of obstruction of justice and one count of witness tampering.

The verdict means he is likely to go to jail, say reports.

Second trial

The jury of six men and six women in Manhattan delivered their guilty verdict after deliberating for two days.

Quattrone reportedly showed no emotion as the verdict was read.

He is due to be sentenced on 8 September.

"I feel like we failed Frank. He's innocent," his lawyer John Keker said, adding that an appeal is planned.

"There's an awful lot of evidence that the jury didn't hear."

This is the second attempt to reach a verdict in the case.

A previous jury was unable to agree, which led the judge to declare a mistrial.

Quattrone resigned from CSFB in March 2003 after being suspended.

His e-mail on 5 December 2000, urged colleagues at the bank to destroy documents at the same time a grand jury and federal regulators were investigating its stock-allocation practices.

The investigation never resulted in criminal charges; the bank later paid a $100m civil settlement.

Quattrone was one of the first bankers to see the coming technology boom.