Musk announced the potential deal after turning down a potential board seat at the company.
UBS ranks highest in overall investor satisfaction with a score of 777, and Vanguard (759) ranks second.
She sold 185,900 shares of Twitter on April 11, one week after Elon Musk revealed his 9.2% stake in the company.
Celebrities on the investor roster include Ashton Kutcher, Justin Bieber, Steve Aoki, and Gwyneth Paltrow.
Could bitcoin's best days already be behind it?
If celebrities can't promote NFTs, it damages one of the most promising use cases for the tokens.
Robinhood's is among the worst high-profile global stock market debuts since the onset of the pandemic.
Billionaire Peter Thiel blamed the finance titans for the digital currency's failure to reach $100,000.
The company's wallet enables users to interact with crypto outside of Robinhood's trading platform.
He also reiterated a call that bitcoin will reach a price of $500,000 and eventually $1 million.
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