Federal prosecutors indicted Mangione last week on two counts of stalking, a firearm offense and murder through the use of a firearm in Thompson's December shooting death.
Mangione, 26, stood with his lawyers as he entered the plea. He leaned forward to a microphone as U.S. District Judge Margaret Garnett asked him if understood the indictment and the charges against him.
The pleas were not unexpected, since Mangione also pleaded not guilty to state charges he's facing in New York and Pennsylvania.
Federal prosecutors say Mangione poses a future danger, alleging in the latest court filing that he intended to "target an entire industry and rally opposition to that industry by engaging in lethal violence."
U.S. Attorney General Pam Bondi previously said prosecutors would seek the death penalty, marking the first time since President Trump vowed to resume federal executions when he took office in January.
Civil and criminal attorney Donte Mills explained the challenges in a death penalty case.
UnitedHealthcare CEO Brian Thompson killed in NYC
The 26-year-old is accused of ambushing Thompson, a husband and father of two, outside a midtown hotel on Dec. 4, 2024. Investigators said Thompson was on his way to an investors conference when he was shot in the back on the sidewalk.
Mangione has pleaded not guilty to state murder and terrorism charges in New York, as well as forgery and weapons charges in Pennsylvania.
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