WASHINGTON The Securities and Exchange Commission plans to propose rules today that are designed to boost the transparency and accountability of the regulated rating agencies known as nationally recognized statistical rating organizations by, among other things, requiring the rating agencies to disclose the ratings history of each security they rate so that investors can then rank the accuracy of the ratings over time.

The SEC's proposed rules come as House Financial Services chairman Barney Frank, D-Mass., plans to introduce legislation in the next two weeks designed to put further requirements on the NRSROs by mandating that they rate municipal bonds, Treasuries, and corporate debt on the same scale.

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