The billionaire could use the money for his lawsuit against Twitter.
Elon Musk sold 7.9 million shares of his company Tesla, earning $6.9 billion, Reuters reported.
The sale took place from August 5 to 9 after Tesla's annual shareholder meeting, which was held on August 4 in Austin.
It also notes that the deal came just weeks after Musk refused to buy Twitter for $44 billion and subsequent lawsuits filed against him.
The publication's experts believe that the billionaire may need the money now, if he does decide to close the deal and buy the company.
Earlier in his account, Musk agreed to buy Twitter stock if the company would publish how it conducts authentication checks on its users.
In late July, Twitter filed a lawsuit against Ilon Musk over the termination of its acquisition deal, to which the businessman filed a counterclaim. The entrepreneur accuses the management of the social network of hiding the number of fake accounts and therefore distorting key indicators.