The SEC and Tesla did not immediately respond to requests for comment.
The tweet ends with "the name change is so on point", which appears to be a reference to the SEC - mocking the agency. (FOX), to replace Elon Musk as the company's chairman, people familiar with the matter told The New York Times.
The SEC declined to comment on the tweet.
Under the deal reached between the SEC and Mr Musk last weekend, Mr Musk will remain as Tesla CEO but has to step down as chairman for three years.
Tesla stock dropped 2 percent in after-hours trading after Thursday's tweet. Musk wrote on Twitter in an apparent jab at the SEC and short sellers, who he has slammed on social media before.
Thomas Gorman, a partner at Dorsey & Whitney in Washington, D.C., said Musk might argue that the latest tweet might be a mere "personal lament", and not a violation of the settlement.
While Musk wanted to fight the SEC, he reportedly had a change of heart when Tesla's stock plummeted almost 14 percent after the lawsuit was announced.
Musk is a long time critic of what he believes is a bias towards Short Sellers (ask an accountant).
Nevertheless, Musk doubled down on Thursday after getting questioned by another Twitter user about the tweet.
"I think it is juvenile and sophomoric and narcissistic, but I don't think it has particular relevance to the subject of the lawsuit against him", said Harvey Pitt, the SEC chairman under President George W. Bush.
Drunk birds are terrorizing people in Minnesota
If they can't fly properly or keep their balance, intoxicated birds are at risk of crashing into hard surfaces. As Dodder told The Post , "Sometimes, they just need a bit of time in a quiet setting to recover".
Trump trusted less than Putin, Xi, says new global study
Much of the world also considered China a rising global power, if not already the most important economic power already. In 22 of 25 countries polled, favorability toward the United States has declined since the end of the Obama presidency.