"Just want to that the Shortseller Enrichment Commission is doing incredible work", he said.
The post risks putting back in play stiffer forms of punishment that the SEC sought last week, including a prohibition on Musk serving as officer of a public company.
His extraordinary slap at federal regulators comes as U.S. District Judge Alison Nathan in Manhattan said on Thursday that Musk and the SEC would have one week to justify their settlement to resolve securities fraud charges against the CEO.
The SEC has responded by denying any plans for a name change, but won't be drawn on the content of the Tweet. (FOX), to replace Elon Musk as the company's chairman, people familiar with the matter told The New York Times.
Under the terms of the settlement, Musk agreed to pay a $20 million fine and step down as chairman of the Tesla board of directors - a position from which he will be barred for three years - as well as have his tweets about Tesla supervised by a company official.
But the deal didn't prevent the free-wheeling Musk from continuing to speak out about other subjects - a liberty he took advantage of to bash the SEC in a Thursday tweet that indicated he is still stewing about the allegations filed against him.
The Tesla boss dislike of short-sellers is well-known: He once called them "jerks who want us to die".
Tesla shares dropped as much as 3.5 percent to $272 after the close of regular trading. "It's what they do", he said of the SEC.
Musk is a long time critic of what he believes is a bias towards Short Sellers (ask an accountant).
The tweet on Thursday was "plainly a statement that the SEC's case against Musk lacked merit", Crimmins said. But according to Recode's Teddy Schleifer, that requirement doesn't kick in for 90 days after signing, giving Musk a few more weeks of unfettered tweeting.
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