Elon Musk is now 'Technoking' of Tesla, and its CFO is now 'Master of Coin,' an SEC filing shows

• Elon Musk has given himself the title of "Technoking" at Tesla, an SEC filing shows.
• Tesla CFO Zach Kirkhorn has also been named "Master of Coin."
• According to the filing, Musk and Kirkhorn will retain their titles of CEO and CFO respectively.

Tesla CEO Elon Musk has officially given himself a new title.

A document filed with the SEC shows that as of Monday, Elon Musk officially has the title of "Technoking" at Tesla.

The same filing shows that Tesla chief financial officer Zach Kirkhorn has also been given the title of "Master of Coin." This is an apparent reference to the television series "Game of Thrones" - or the book series it was based on, "A Song of Ice and Fire" - in which the position of royal treasurer was called "Master of Coin."

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It is not immediately clear why Musk chose the title "Technoking," and the SEC filing says that both men will also retain their positions as CEO and CFO. Kirkhorn's signature is on the document.

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The move is in keeping with Musk's public persona, as the Tesla CEO appears to enjoy putting out irreverant tweets and jokes - normally via his preferred medium of Twitter.

His communications have been a worry for stakeholders in the past, and last week a Tesla investor sued the company's board over his "erratic" tweets.

Musk previously also held the role of chairman at Tesla, but was forced to step down as part of a settlement with the SEC in 2018 after the agency accused him of tweeting "false and misleading statements" about taking the company private.