Elon Musk offered to buy Twitter for $54.20 a share in a filing published on April 14, saying the social media company needs to be transformed privately. Musk’s offer values Twitter at about $43 billion.

According to Musk, the social media company needs to go private because it can “neither thrive nor serve” free speech in its current state.

“As a result, I am offering to buy 100% of Twitter for $54.20 per share in cash, a 54% premium over the day before I began investing in Twitter and a 38% premium over the day before my investment was publicly announced,” he wrote. “My offer is my best and final offer and if it is not accepted, I would need to reconsider my position as a shareholder.”