British citizen Kareem Serageldin, 40, was extradited by Great Britain to the United States in April and accepted to plead guilty.
The fraud allegedly took place between late 2007 and early 2008, as the collapsing US housing bubble sent millions of home mortgages into default and wiped off hundreds of billions of dollars in value from mortgage-backed securities widely held by banks and other institutional investors.
In March 2008, Credit Suisse announced it was restating its 2007 year-end earnings with a $2.65-billion write-down, a large portion of it related to the fraud.
Serageldin was also sentenced to two years of supervised release and ordered to pay USD 1 million forfeiture, a USD 150,000 fine and a USD 100 special assessment.
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David Higgs and Salmaan Siddiqui, who worked under Serageldin in the investment banking division of the Swiss bank, pleaded guilty in a New York court last year to one count of conspiracy to falsify books and records and commit wire fraud.
The defendants were charged with inflating the prices of asset-backed bonds, which comprised sub prime residential mortgage-backed securities and commercial mortgage-backed securities in Credit Suisse's accounts.
Serageldin, Higgs and Siddiqui secured significant year-end bonuses for themselves through the alleged fraud since bonus amounts were largely based on trading books' profitability, officials said.