WASHINGTON — First Southwest Co., as bidding agent for a repurchase agreement related to a $233 million bond deal in Texas for which it was financial adviser, improperly allowed JPMorgan Securities to lower its bid for the repo, reducing the issuer’s investment rate, according to documents and transaction participants.

The Securities and Exchange Commission said the deal, involving bonds issued in 2005 by the Central Texas Regional Mobility Authority, was one of many that involved “fraudulent bidding practices” that JPMorgan engaged in with the assistance of bidding agents.

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