An investor in Twitter has filed a lawsuit against Elon Musk over the billionaire’s secret purchase of Twitter stock that sent the price soaring after it became public. Musk bought his enormous slice of Twitter shares on March 24, but the public didn’t learn about it until April 4.

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Marc Rasella filed a lawsuit in federal court on Tuesday alleging that Musk’s failure to disclose his purchase of 9.2% of Twitter stock quickly enough caused Rasella to lose money. Rasella sold shares while Musk’s stock purchases weren’t yet public.

SEC rules state that large purchases of stock must be reported to the regulatory agency through the filing of a Schedule 13 after anyone acquires more than 5% of a company. Musk didn’t file the document until April 4, 2022, a full ten days after Musk reached the 5% threshold, and a major breach of the law.

Twitter’s stock price rose roughly 27% after the billionaire finally filed the right paperwork. Rasella sold shares during the period when Musk’s purchase was a secret and he wants his lawsuit to get class action status, involving anyone who sold their shares when Musk was in violation of the law.