Federal prosecutors brought what they called ‘‘the most lucrative insider trading scheme ever charged,’’ filing a criminal case Tuesday against a former trader at a unit of the hedge fund SAC Capital. Mathew Martoma, a former trader at CR Intrinsic, a division of SAC Capital, was charged with making about $276 million in combined profits and avoided losses by obtaining confidential information about a drug trial for an Alzheimer’s drug developed by the pharmaceutical companies Elan and Wyeth.
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