Discussions over the deal,which last week appeared uncertain,accelerated over the weekend after Muskwooed Twitter shareholders with financing details of his offer.
Under pressure,Twitter started negotiating with Musk to buy the company at the proposed $US54.20 per share price.
“Free speech is the bedrock of a functioning democracy,and Twitter is the digital town square where matters vital to the future of humanity are debated,” Musk said in a statement.
Shares were up about 6 per cent following the news. The deal represents a near 40 per cent premium to the closing price the day before Musk disclosed he had bought a more than 9 per cent stake. Even so,the offer is below the $US70 range where Twitter was trading last year.
The transaction was approved by the board and is now subject to a shareholder vote.
In a prepared statement the company said Musk secured $US25.5 billion of debt and margin loan financing and is providing a $US21 billion equity commitment.