U.S. securities regulators charged four former Credit Suisse traders for their roles in an alleged scheme to overstate the prices of $3 billion (1 billion pounds) in subprime bonds during the financial crisis.

The Securities and Exchange Commission's civil charges, filed in a Manhattan federal court on Wednesday, came just after two of the defendants, David Higgs and Salmaan Siddiqui, pleaded guilty to parallel criminal charges.

The other two traders charged in the SEC case were Kareem Serageldin, a former global head of structured credit trading for the bank, and Faisal Siddiqui, a former vice president for the bank's CDO trading group.

(Reporting By Sarah N. Lynch; Editing by Tim Dobbyn)