In a sign of its concerns about Atul Gawande's new venture, Optum sues over trade secrets

One of the nation’s largest health insurers has filed a federal lawsuit to protect its trade secrets from the health care venture launched by Amazon, JPMorgan Chase & Co., and Berkshire Hathaway, making it clear it sees the upstart company as posing a major threat to its business on a national scale. The lawsuit, filed by Optum Inc. in Massachusetts District Court in Boston on Jan. 16, seeks a court order to block one of its former executives, David Smith, from sharing confidential corporate information he allegedly accessed just before he was hired by the new health care company last month.