According to Bloomberg's Billionaire Index, Musk slid into the third spot and is now worth an unfathomable $115 billion (£85,639,925,000), while Zuckerberg drops to fourth place with $111 billion (£82,661,145,000). I'm sure he's inconsolable...
The boost to his wealth comes from a 500 percent rise in Tesla stocks, which has seen an extra $87.8 billion (£65,384,221,000) added to his fortune this year.
Tesla stocks hit an all time high at the end of last month, at $2,213 (£1,648) per share.
They're now sitting around the $500 (£372) mark following a 'forward split', where a company multiplies the amount of shares each person holds.
These splits don't see the company lose any value, but they do lower the value of each individual share. Its hoped that these new lower cost shares will encourage more investors to splash their cash with the company.
Tesla said on Tuesday it plans to raise another $5 billion (£3,724,250,000) through stock sales.
Musk is now only behind Microsoft founder Bill Gates, who is worth an estimated $125 billion (£93,106,250,000), and Amazon boss Jeff Bezos, who is worth $200 billion (£148,970,000,000).
Last week, Musk revealed fresh details about his Neuralink brain chip, describing the device as 'kind of like a Fitbit in your skull'.
He then presented a pig who had been fitted with one of the devices.
Introducing Gertrude to the viewers, Musk said: "We have a healthy and happy pig, initially shy but obviously high energy and, you know, kind of loving life, and she's had the implant for two months."
He also took questions, one of which asked if there could be a possibility to 'save' and 'replay' human memories in the future.
To which Musk said: "Yes, I think in the future you'll be able to save and replay memories.
"I mean, this is obviously sounding increasingly like a Black Mirror episode. But... well, I guess they're pretty good at predicting."
He added: "Essentially, if you have a whole brain interface, everything that's encoded in memory you could upload.
"You could basically store your memories as a backup and restore the memories. Then ultimately you could potentially download them into a new body or into a robot body.
"The future's going to be weird."
You can say that again, but at least Musk can be fairly certain his will be comfortable.
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