Elon Musk reportedly plans to serve as Twitter’s interim chief executive after his $44 billion takeover of the social media giant is complete – adding yet another CEO title to his busy schedule.

The 50-year-old tech tycoon — who is currently CEO of Tesla and SpaceX, as well as smaller startups including the brain-implanted computer company Neuralink — is expected to fill the top job at Twitter on a temporary basis likely lasting a few months, CNBC reported on Thursday, citing sources familiar with the matter.

The report appeared to spook Tesla investors. Shares of the Musk-led electric car firm were trading more than 3% lower after the opening bell.

Representatives for Twitter and Musk did not immediately return a request for comment on the report.

Musk has yet to publicly address his plans for Twitter’s long-term leadership. He has outlined several goals for the app once the deal closes, including a renewed focus on free speech, the elimination of spam bots and an overhaul of Twitter’s monetization strategy.

Last week, Reuters reported that Musk has already identified a CEO candidate for Twitter – though the individual has yet to be identified.

Musk’s buyout has sparked speculation that current executives, such as Twitter CEO Parag Agrawal and the company’s top legal officer, Vijaya Gadde, will be out of a job when the transaction is complete.