The volatile nature of the markets over the past year demonstrates how difficult it is to time the market. If you bought stocks last January, you probably struggled, but if you bought in the summer, you are a hero. And that regardless of whether it was the same companies in each instance.

An alternative to trying to time the market (which even famed investor Warren Buffett says he can't do) is to buy high-quality growth companies with long-term growth prospects at any point in time and hold on to the stock long-term.

In that vein of thought, here are three growth stocks purchased by another famed investor, Cathie Wood of Ark Invest, through her investment firm's various Ark funds. All three are solid buy-and-hold candidates.

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Source Fool.com