McGraw-Hill Cos.' Standard & Poor's and Moody's Corp. won dismissal of a lawsuit claiming the companies had defrauded investors who relied upon their ratings before buying $63 billion of investment-grade mortgage-backed securities.

U.S. District Judge Jed Rakoff in New York also dismissed some claims Wednesday against JPMorgan Chase & Co., Bank of America Corp.'s Merrill Lynch and ABN Amro Bank NV, a unit of Royal Bank of Scotland Group PLC, in a lawsuit filed by institutional investors.

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