WASHINGTON — The sentencing dates of more convicted municipal bond bid-riggers have been pushed back, according to documents filed with the U.S. district Courts for the Southern District of New York and Western District of North Carolina, as prosecutors seek stiffer penalties for price-fixing of investment contracts.

Former J.P. Morgan Chase & Co. executive James Hertz, who was to be sentenced on June 28, and Mark Zaino, a former UBS employee who had a July 8 sentencing date, had their hearings delayed to July 29 and Sept. 17, respectively. David Rubin of CDR Financial Products Inc., will hear his fate Oct. 18, while CDR executives Douglas Goldberg and Daniel Moshe Naeh's date has been pushed back to March 20, 2014. The CDR executives' hearings were pushed back from April 11.

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