Up 66%, 15%, and 24% year to date, respectively, Shopify (NYSE: SHOP), Kinsale Capital (NYSE: KNSL), and Celsius (NASDAQ: CELH) may have investors wondering if they have missed their opportunities to buy. Certainly none of them are "cheap" by traditional valuation methods.

So why exactly are they interesting?

Simply put -- each company thoroughly dominates its niche.

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Source Fool.com