Citi disclosed Friday in a 10-Q quarterly filing with the Securities and Exchange Commission that it has received subpoenas or requests for information from several self-regulatory agencies and federal authorities, including the SEC and state regulators in Texas, New York, and Massachusetts, which are all investigating the bank's auction-rate securities sales practices.

The firm said the SEC has issued a formal order of investigation into whether various provisions of the federal securities laws were violated in connection with the sale of auction-rate debt.

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