Musk struck a deal with Twitter to buy the social web connection for $44 billion.
Theletter, published Friday, shows that the SEC has been looking into Musk’s late disclosure.
The large stake made him one of the largest shareholders of the social influential web link.
The SEC declined to comment on Friday beyond what has been revealed in public documents.
The letter the SEC sent to Musk includes four questions, including why he made the late disclosure.
By not disclosing this publicly, Musk was able to buy more shares without alerting shareholders.
CNET couldn’t immediately reach Musk for comment and he hasn’t tweeted about the SEC letter.
CNET reached out viaTesla’spress email, but the company dissolved its PR department.
