The world’s wealthiest man reached an agreement on April 25 to acquire Twitter for $44 billion using a financing plan that’s alarmed some Tesla investors. In addition to pledging tens of billions of dollars worth of his Tesla shares to support margin loans, Musk has vowed to line up some $21 billion worth of equity. It’s been unclear how much of that would come from selling a portion of his Tesla stake.

The latest disclosures come after Musk tweeted Thursday that he has “no further Tesla sales planned after today.” He still has time to file more Form 4s disclosing additional sales if more took place on Thursday.

Tesla shares climbed 4.9% to $920.29 as of 10:25 a.m. Friday in New York, paring this week’s steep decline.

The Twitter deal is poised to be one of the biggest leveraged buyouts in history, with Musk arranging $25.5 billion of debt and margin-loan financing from lenders including Morgan Stanley. If it were to fall apart, the party breaking up the agreement would be required to pay a termination fee of $1 billion, under certain circumstances.

See also: Musk wasn’t sure Twitter deal would succeed

Musk’s pursuit of Twitter has once again highlighted the extent to which Tesla’s valuation hinges on how involved and invested its CEO is in the business. He has headed the company since 2008 and long been its biggest shareholder.

Tesla’s stock slumped late last year as Musk offloaded more than $16 billion worth of shares, his first sales in more than five years. The disposals started in November after Musk polled Twitter users on whether he should trim his stake.

With a $252.2 billion fortune, Musk is the world’s richest person, according to the Bloomberg Billionaires Index. The recent slump in Tesla shares has shaved $18 billion off his net worth this year, even as the carmaker has reported better-than-expected earnings and opened new plants in Germany and Texas.