WASHINGTON — The Securities and Exchange Commission voted yesterday to propose the first two sets of new rules for credit rating agencies that would limit their conflicts of interest, increase their disclosure, and encourage them to provide symbols for structured finance products so that investors can better differentiate between these and corporate or municipal securities.

The proposals come in response to record losses reported by Wall Street firms with investments in tainted subprime-mortgage bonds, which were rated triple-A despite their poor credit quality. They are the first the commission has considered since last year's implementation of the Credit Rating Agency Reform Act, which gave the SEC the authority to register and regulate certain rating agencies as nationally recognized statistical rating organizations.

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