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Billionaire Steve Ballmer has more than 80% of his portfolio in Microsoft stock and advises everyday investors to ‘keep it simple’

Fortune
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Steve Ballmer is worth $151 billion on the Bloomberg Billionaires Index.

The former Microsoft CEO says 80% of his investment portfolio is in Microsoft stock.

He says the company has outperformed "just about every other asset I could have owned" Microsoft has returned an average of about 29% annually in recent years .