Three former Marsh & McLennan Companies executives involved in the startup of a London-based unit for Integro Ltd. brokerage cannot be sued in the United States, according to a U.K. Court of Appeal decree.

New York-based MMC, which encompasses Marsh Inc. brokerage and reinsurer Guy Carpenter Inc., sued the three executives after they left the Guy Carpenter London office to form an international insurance and reinsurance unit for Integro Ltd. Integro has a New York headquarters.

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