(CNN Money) — Elon Musk has tweeted himself into serious trouble.

The Securities and Exchange Commission sued Tesla’s CEO on Thursday for making “false and misleading” statements to investors.

It’s asking a federal judge to prevent Musk from serving as an officer or a director of a public company, among other penalties.

The complaint hinges on a tweet Musk sent on August 7 about taking Tesla private. “Am considering taking Tesla private at $420,” Musk said. “Funding secured.”


The SEC said he had not actually secured the funding.

“In truth and in fact, Musk had not even discussed, much less confirmed, key deal terms, including price, with any potential funding source,” the SEC said in its complaint.

That tweet, and subsequent tweets from Musk over the next three hours, caused “significant confusion and disruption in the market for Tesla’s stock,” as well as harm to investors, the SEC said. On the day of Musk’s tweet, Tesla’s stock shot up nearly 9%. It has declined substantially since then.

Tesla’s stock dropped more than 5% in after-hours trading Thursday. The company and the SEC declined to comment.

“This is serious. This is what you go after insider traders and market manipulators on,” said Charles Whitehead, professor at Cornell Law School. “This is a serious allegation.”

Musk, who is planning to build an underground high-speed transit system in Chicago connecting downtown to O’Hare International Airport, abandoned the plan to take Tesla private less than three weeks after he first tweeted about it.

He later said his “funding secured” comment was based on talks with Saudi Arabia’s sovereign wealth fund, which he said had urged him to take the company private and offered to increase its investment in Tesla.

The Justice Department is also investigating whether comments made by Musk, Tesla said last week. The company said it had received a voluntary request for documents and is cooperating. Tesla said it had not been subpoenaed.

Shareholders have also filed lawsuits charging that Musk made the claim to manipulate the stock price.

CNNMoney’s Matt Egan contributed to this report.

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