The McGraw-Hill Companies of New York, parent company of Standard & Poor's, filed a lawsuit against Vanguard Group of Malvern, Pa. charging that Vanguard breached the 15-year-old licensing agreement it had with S&P by registering a new class of exchange-traded shares on three of Vanguard's equity index funds without the index creator's approval.

The suit was filed in the U.S. District Court for the Southern District of New York. The law firm of Weil, Gotschal & Manges, LLP of New York is representing McGraw-Hill.

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