Commonwealth Secretary William F. Galvin last week sent a letter to nine different investment firms seeking disclosure information about closed-end funds that have experienced problems in the auction-rate market.

Galvin sent the letter to Eaton Vance Managed Investments, Evergreen Investment Management Co., Allianz Global Investors, John Hancock Advisers LLC, MFS Investment Management, Nuveen Asset Management, Pioneer Investment Management Inc., BlackRock Financial Management Inc., and Calamos Financial Services LLC.

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