Finding great companies while they are still small is a smart strategy to identify stocks that can potentially make you a millionaire investor. It's all about putting money to work in growing companies that still have a large expansion opportunity. But it can take time for even the best growth stocks to grow your savings. If you had bought $10,000 of Walmart stock in 1980, it would have turned into $1 million after 18 years.

With that in mind, let's look at three promising companies that a team of Motley Fool contributors believe have the potential to grow significantly in value over the long term.

John Ballard (Cava Group): Every decade, it seems like at least one new restaurant chain emerges in the stock market and goes on to deliver massive returns for early investors. A $10,000 investment in Chipotle Mexican Grill (NYSE: CMG) at its initial public offering in the early 2000s would already be worth $611,000. Cava Group (NYSE: CAVA) could be next in line.

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Source Fool.com