Tesla shares surged more than 10 percent after being halted for more than an hour.
Musk issued a string of tweets about possibly taking the company private at $420 a share.
Later, the company issued a blog post that said a final decision had not yet been made.
Tesla’s market value at $420 a share would be about $71 billion.

Robert Ferris | @RobertoFerris

CNBC.com

Tesla CEO Elon Musk stunned investors Tuesday with a string of tweets saying he is considering taking the company private, in what would be the largest deal of its kind.

“Am considering taking Tesla private at $420. Funding secured,” Musk said in a tweet shortly before 1 p.m. Musk discussed the plans further in a blog post later Tuesday.

From there Musk tweeted several times. In responses to questions on Twitter, Musk said he will ensure the prosperity of shareholders “in any scenario.” If Tesla went private, current investors could keep their stakes in Tesla through a special fund, or sell their shares at $420, he said.

Shares jumped after Musk’s first tweet, trading as high as $371.15 before giving back gains. Later the stock was halted for more than an hour. When it reopened shares surged more than 10 percent.

Tesla shares were already trading higher on a report of a new stake from the Saudi Arabia sovereign wealth fund.

In the past year, Tesla shares have traded as low as $244.59 in April and as high as $389.61 in September.

Tesla went public in 2010. Its current market value is $61 billion. At a share price of $420, the company would be worth $71.3 billion.

Although Musk mentioned funding in his initial tweet, a blog post from Tesla did not include any mention of financing. CNBC also contacted a number of Wall Street banks and none of them was aware of any transaction or had committed to funding a leveraged buyout of Tesla.

The Securities and Exchange Commission also declined to comment on the matter. However, companies are allowed to use social media outlets like Facebook and Twitter to announce news, the SEC said in 2013.

He also said he does not currently have a controlling vote in the company and wouldn’t expect a single shareholder to have one if the company were private. He said he had no intention of selling his stake, and he said he would remain as CEO.

Taking Tesla private could remove some of the pressure on the closely watched company. Private firms, for example, are not required to publicly report quarterly earnings. Musk also said being private would end “negative propaganda from shorts.”

Musk has said he expects Tesla to begin being profitable in the third quarter of 2018.

Investors have been concerned about the amount of cash Tesla has been burning through and whether the company would need to raise additional funds to support its growth plans, which include introducing a semi-truck, a crossover SUV called the Model Y, more factories around the world, and other projects.