A federal judge on Monday rejected Elon Musk's bid to void a jury verdict finding that the world's ​richest person defrauded Twitter investors by trying to ​drive down the social media company's stock price after agreeing to a $44 billion takeover.

U.S. District ​Judge Charles Breyer in San Francisco also denied Musk's motion to decertify the class of investors, and granted the investors' motion for prejudgment interest. The judge did, however, find Musk not liable for one of his challenged tweets.

"Even if the speaker has a change of heart or a momentary ‌regret about a ⁠transaction, such ⁠qualms do not justify lying to the investing public," Breyer wrote.

A lawyer for the investors had estimated following the March 20 verdict that damages could total about $2.5 ​billion.

Lawyers for Musk did not immediately respond to requests for comment. The investors' lawyers did not immediately respond to similar requests.

Musk changed Twitter's ​name to X, and it is now part of his rocket and satellite company SpaceX. He also faces a lawsuit in Manhattan claiming he defrauded Twitter investors by waiting too long to disclose his initial investment, letting him buy shares cheaply and ​causing them to sell at low prices.

'Substantial evidence of falsity'

Jurors found Musk liable for ⁠May 13 ‌and May 17, 2022, tweets in which he questioned whether Twitter was overrun by fake and ​spam accounts, known as ​bots.

The May 13 tweet said the purchase was "on hold" pending details on whether bots represented ⁠less than 5% of users, while the May 17 tweet said the purchase "cannot ​move forward" until Twitter's chief executive proved the percentage was under 5%.

Investors said Musk did ​this to force Twitter to renegotiate his offer, or let him back out. They also said the first tweet caused Twitter's share price to fall 18% over two trading days, causing losses when they sold their shares at depressed prices.

Breyer found "substantial evidence of falsity" in the May 13 tweet, and said "a jury could conclude that Musk had a motive to get out of the existing deal and used bots as a pretext to do so."

The judge agreed with Musk that the lack of market reaction to ‌the May 17 tweet meant it did not cause investors to lose money.

Judge rejects '420' claim

Breyer also rejected Musk's claim that jurors were "mocking" him and using the verdict to "send a message" by highlighting the figure "$4.20" ​in bright blue ​on the verdict form.

The number 420 ⁠is associated with marijuana culture, and Musk has often used it in interviews, tweets and in business activities.

Musk's takeover of Twitter valued the company at $54.20 per share. In another example, Musk's 2018 tweet that he had "funding secured" to take his electric car ​company Tesla private for $420 per share prompted a U.S. Securities and Exchange Commission civil fraud lawsuit, which he later settled.

The judge, however, said it "defies common sense" that jurors were biased against Musk, noting that they deliberated over nearly four days and sided with Musk on some claims. Breyer also found no evidence that 420 was negatively associated with Musk.

"To the contrary, 420 is a reference to cannabis/marijuana," Breyer wrote. "One need only walk around San Francisco on April 20 to observe how prevalent the celebration can be."