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.
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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.
The ProShares Short Bitcoin Strategy ETF would track the inverse performance of an index of bitcoin futures.
The embrace of crypto shows the influence of social media and the popularity of risky investments.
Musk has been one of the biggest personalities on Twitter and has regularly run into trouble on the platform.
Sam Bankman-Fried drives a Corolla, sleeps on a beanbag and has a Robin Hood-like philosophy.
Robo-advisors were estimated to have $785 billion in assets as of year-end 2020.
One of his priorities is to prevent tech platforms from acquiring technologies that threaten their dominance.
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Voyager is third crypto broker targeted for selling unregistered interest-bearing accounts.
A basket of 37 meme stocks tracked by Bloomberg has surged 45% off a March bottom.
The acquisition is expected to expand Goldman Sachs' services to the defined contribution market through personalized managed accounts and digital advice.