Elon Musk has made an offer to buy Twitter Inc.

It has been reported that the richest man in the world offered to buy Twitter for about $43 billion at $54.20/share in cash.

The 50-year-old tycoon announced the offer in a filing with the US Securities and Exchange Commission on Thursday.

Musk’s offer price of $54.20 per share represents a 38 percent premium to the closing price of Twitter’s stock on April 1, the last trading day before the Tesla CEO’s over nine percent investment in the company was publicly announced on April 4.