Experts are calling Bitcoin a bubble even after its 35% plunge last month: Here's what you need to know

The view that Bitcoin is a hallmark of speculative excess and froth is still going strong, even after last month’s 35% plunge.

About 80% of fund managers surveyed Bank of America called the market a bubble, up from 75% in May. The poll, which captures the view of 207 investors with $645 billion in assets, said “long Bitcoin” is the second-most crowded trade after commodities.

The results point to a scepticism among some professional managers about whether crypto is a viable asset class, given its extreme volatility and regulatory uncertainty. Bubble fears are nothing new for cryptocurrencies, and plenty of investors have voiced doubts over the wisdom of wading into an asset that has no fundamental underpinning.

Even though prices have tumbled, investment banks are still embracing the emerging asset class. Goldman Sachs Group said it plans to roll out derivatives tied to Ethereum to clients, and Cowen plans to offer “institutional-grade” custody services for cryptocurrencies.

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Prices also got a boost this week from veteran hedge fund manager Paul Tudor Jones, who reiterated his view that Bitcoin is a good hedge against inflation.

“I like Bitcoin as a portfolio diversifier,” Tudor Jones of Tudor Investment said in an interview with CNBC. “Everybody asks me what should I do with my Bitcoin? The only thing I know for certain, I want 5% in gold, 5% in Bitcoin, 5% in cash, 5% in commodities.”