Elon Musk, the maverick boss of Tesla, is now not the world’s richest individual after shares within the electrical automobile firm dropped 8.6% on Monday, wiping $15.2bn (£10.8bn) off his fortune.

Musk, who final month leapfrogged Amazon founder Jeff Bezos to take the title of the world’s wealthiest individual, dropped again into second place with a $183bn estimated fortune behind Bezos’ $186.3bn.

The 8.5% drop in Tesla’s share worth on Monday – the sharpest one-day fall since September – was partly fuelled by Musk tweeting that the costs of bitcoin and different cryptocurrencies “do appear excessive”. Tesla’s shares had been down an extra 6% in pre-market buying and selling on Tuesday.

His feedback got here simply two weeks after Tesla purchased $1.5bn of bitcoin, which despatched the value of the cryptocurrency to recent highs. Bitcoin, which reached a excessive of $58,000 on Sunday, has since fallen to $47,500 on Tuesday morning. The value remains to be up greater than 500% over the previous 12 months.

Replying on Twitter to Peter Schiff, a stockbroker and gold investor, Musk mentioned: “Cash is simply information that enables us to keep away from the inconvenience of barter. That information, like all information, is topic to latency and error. The system will evolve to that which minimises each. That mentioned, bitcoin and ethereum [another cryptocurrency] do appear excessive.”

Scottish Mortgage Funding Belief, which is managed by Tesla shareholder Baillie Gifford, was the most important faller on the FTSE 100 on Tuesday, down 11%. Baillie Gifford was the most important faller on the FTSE 250, down 8%.

Musk had final week mentioned Tesla’s choice to purchase $1.5bn in bitcoin was an organization choice not pushed by him. “Tesla’s motion shouldn’t be instantly reflective of my opinion,” Musk mentioned, once more on Twitter.

“Having some bitcoin, which is just a much less dumb type of liquidity than money, is adventurous sufficient for an S&P 500 firm … When fiat [government-issued] foreign money has adverse actual curiosity, solely a idiot wouldn’t look elsewhere. Bitcoin is nearly as bs [bullshit] as fiat cash. The important thing phrase is ‘virtually’.”

Tesla disclosed the bitcoin holding in a submitting with the US Securities and Change Fee final month. The corporate mentioned it had “up to date our funding coverage to offer us with extra flexibility to additional diversify and maximise returns” to permit it to speculate money reserve in “various reserve belongings together with digital belongings”.

It mentioned that for the reason that choice was authorised by its audit committee it had “invested an combination $1.5bn in bitcoin underneath this coverage and should purchase and maintain digital belongings once in a while or long run”.

Musk has beforehand helped to drive the recognition of cryptocurrencies, together with bitcoin and dogecoin, by frequently tweeting that he’s a “supporter” of the cryptocurrencies. He has additionally joked that bitcoin is his “safeword”.

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Final month, the value of bitcoin soared after Musk mentioned he was a supporter of the cryptocurrency in an interview carried on Clubhouse, a brand new social media app designed for rich folks. “I do suppose at this level bitcoin is an efficient factor,” he mentioned. “And, so, I’m a supporter of bitcoin. Like I mentioned, I used to be late to the celebration, however I’m a supporter of bitcoin. And I feel, bitcoin is de facto on the verge of getting broad acceptance by standard finance folks.”

He has beforehand modified his Twitter biography to “#bitcoin”.

Musk additionally tweeted on Monday that Tesla’s Mannequin Y Commonplace Vary SUV would nonetheless be obtainable “off the menu”, following studies from electrical automobile newsite Electrek that the mannequin had been eliminated as an possibility on-line.