Twitter stock

Shares of Twitter Inc. undefined soared 12.2% in premarket trading Thursday, after Tesla Inc. undefined "Technoking" Elon Musk disclosed a proposal to buy.

The disclosure comes in a 13D/A filing with the Securities and Exchange Commission early Thursday, in which Musk confirmed his previous disclosure of owning 73.12 million Twitter shares, or 9.1% of the shares outstanding. Shares of Twitter Inc. TWTR,+3.55%soared 12.2% in premarket trading Thursday, after Tesla Inc. TSLA,-3.43%"Technoking" Elon Musk disclosed a proposal to buy all of the outstanding shares of the social media company he doesn't already own for $54.20 each. That represents an 18.2% premium to Wednesday's closing price of $45.85. With 800.64 million shares outstanding as of Feb. 10, Musk's bid would value Twitter at $43.39 billion.