Engineer Charged With $1.4M Insider Trading Profit From Constellation Nuclear Restart Deal

According to the U.S. Attorney's Office for the District of Delaware, Casey Muggleston, an engineering manager at Constellation Energy, was charged with securities fraud and insider trading on June 25, 2026. Prosecutors alleged that Muggleston used confidential information about Project Tetris—the plan to restart Three Mile Island Unit 1 and supply power to Microsoft—to purchase call options before the September 20, 2024 announcement. He sold 550 contracts the same day for approximately $1.48 million. Constellation shares rose 22.3% following the announcement of the 20-year Microsoft power purchase agreement. The SEC's parallel civil complaint alleges Muggleston had access to confidential project information from at least May 2024 and that his role as an engineer gave him visibility into restart planning that was not yet public.
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