The Securities and Exchange Commision has formally listed Tesla CEO Elon Musk as a defendant in a lawsuit.

The Securities and Exchange Commission filed the lawsuit on Thursday over what appears to be alleged securities fraud, likely tied to Musk's "taking Tesla private" claim and/or secured funding claims.

Neither the SEC nor Tesla/Musk can comment on this due to it now being an open, official lawsuit.

***UPDATE: Scratch that. Musk commented to CNBC:

"This unjustified action by the SEC leaves me deeply saddened and disappointed. I have always taken action in the best interests of truth, transparency and investors. Integrity is the most important value in my life and the facts will show I never compromised this in any way."

***UPDATE 2: Tesla board comments. See embedded Tweets below:

We've embedded the entire document on this developing story directly below: