Comerica Inc. said Thursday that its Comerica Securities Inc. had finalized its settlement agreement with the Financial Industry Regulatory Authority to repurchase $10 million of auction-rate securities from retail customers and pay a $750,000 fine.

The $65.2 billion-asset Dallas company said in a Securities and Exchange Commission filing that the securities unit had completed the buyback on Dec. 19. The filing also said that , Comerica Securities had concluded its offer to repurchase auction-rate securities from nonretail customers on Dec. 19, pursuant to the settlement agreement. The filing did not disclose the amount of auction-rate securities repurchased from nonretail customers, if any.

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