You generally don't want to mindlessly copy someone else's portfolio, because different strategies work better for different investors. Not everyone has the same investment style, risk tolerance, financial goals, or time horizon. That said, there is nothing wrong with looking to investors -- especially ones with proven success -- for investment ideas.

There are two billionaires in particular, Warren Buffett and Cathie Wood, that investors often look to for inspiration. If you're looking for a few stocks owned by the billionaire investors to add to your portfolio, the following three are great options. These stocks are owned by Buffett's Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) or Wood's ARK Invest.

Although Visa accounts for a small portion of Berkshire Hathaway's stock portfolio, it's one of the more surefire blue-chip stocks the Buffett-run company owns.

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Source Fool.com