Elon Musk offered to push through with his buyout of Twitter at the original agreed price, as a trial over his efforts to withdraw from the deal loomed.
According to reports, Twitter received the letter from Musk, and said it intends to close the buyout deal at the agreed-on price of $54.20 per share.
The latest twist in the long-running saga came ahead of the high-stakes court battle launched by Twitter in an attempt to hold the Tesla chief to the deal he signed in April.
Musk's potential stewardship of the influential social media site has sparked worry from activists who fear he could open the gates to more abusive and misinformative posts.