By Dana Hull, Bloomberg

Tesla Inc. sued a former engineer with the company’s highly secretive Optimus program, accusing him of stealing confidential information about the humanoid robot and setting up a rival startup in Silicon Valley.

Zhongjie “Jay” Li worked at Tesla between August 2022 and September 2024, according to a complaint filed in a San Francisco Federal Court late Wednesday. Li worked on “advanced robotic hand sensors—and was entrusted with some of the most sensitive technical data in the program,” Tesla’s lawyers said in the complaint.

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The suit, also filed against his company Proception Inc, alleges that in the weeks before his departure, Li downloaded Optimus-related files onto two personal smartphones and then formed his own firm.

“Less than a week after he left Tesla, Proception was incorporated,” according to the complaint. “And within just five months, Proception publicly claimed to have ‘successfully built’ advanced humanoid robotic hands—-hands that bear a striking resemblance to the designs Li worked on at Tesla.”

Li, who lists himself as founder and CEO of Proception on LinkedIn, didn’t respond to requests for comment sent outside of normal working hours on the platform. The company didn’t immediately respond to an emailed message seeking comment or message sent through its website. Proception is based in Palo Alto, California.

Attorneys for Li or the company weren’t immediately visible in court filings.

Making a hand that is as dexterous as a human one is one of the biggest challenges in robotics. Tesla intends for Optimus to perform several tasks, from working in the electric automaker’s factories to handling every day tasks like grocery shopping and babysitting. On Tesla’s earnings call in January, CEO Elon Musk said that Optimus has the most sophisticated hand ever made.

“My prediction long-term is that Optimus will be overwhelmingly the value of the company,” Musk said.

An exhibit to the complaint includes an emailed reminder to the Optimus team from August 2024 telling staff that Tesla IT assets and networks are monitored and that “incidents of mishandling or suspected theft of Tesla property, including data and code, will be thoroughly investigated.”

Li’s “conduct is not only unlawful trade misappropriation — it also constitutes a calculated effort to exploit Tesla’s investments, insights, and intellectual property for their own commercial gain,” Tesla’s lawyers said in the filing.

Milan Kovac, the head of engineering for Optimus, left Tesla last week, Bloomberg first reported. Ashok Elluswamy, who leads Tesla’s Autopilot teams, will take over responsibility for Optimus.

The case is Tesla, Inc. v. Proception, Inc. et al, Docket No. 5:25-cv-04963 (N.D. Cal. Jun 11, 2025), Court Docket

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