Founded in by brothers Tom and David Gardner, The Motley Fool helps millions of people attain financial freedom through our website, podcasts, books, newspaper column, radio show, and premium investing services. Stocks don't go up or down in a straight line.

So, with shares flirting with new highs, a drop isn't unexpected. As markets fall, buying shares in fast-growing companies on sale could lead to market-beating performance when markets return to their winning ways. SHOP , Lumentum NASDAQ: These three companies are among my favorite growth stocks to buy right now because all of them offer remarkable sales growth in very big markets.

Shopify was founded after its CEO decided he could do a better job building a solution to sell snowboards online. Today, his solution helps hundreds of thousands of retailers attract customers, process payments, and manage inventory. Small and mid-size retailers rely on Shopify to establish their brand and optimize their e-commerce stores.

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Large retailers turn to Shopify to manage complex marketing, sales, and data needs. In exchange, Shopify collects monthly subscription fees plus a share of sales processed using its payment platform. Clearly, Shopify's business model is working. It isn't turning a profit yet, but the market opportunity is massive, and that has me thinking it's only a matter of time before it starts rewarding investors with net income.

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That suggests there's plenty of growth still ahead. The company makes sensors that can enable consumer devices like smart phones to do 3D sensing, and management recently told investors it had locked up a big order for delivery beginning in the September quarter.

It hasn't said which company placed the order, but rumors are that Apple plans on including 3D sensing in its upcoming iPhone 8. Sales of these sensors could be a big win. We don't have specifics yet on how much revenue could climb because of 3D sensing, but management will probably offer up more detail next quarter. If Apple is the source of the demand, then it could be a big boon.

Celgene's already a top stock in biotech, but sales could take a big leap forward if the FDA OKs ozanimod next year. Oral MS drugs have quickly won market share away from prior generation drugs, including Avonex, that are given via injection. Results from a second MS trial for ozanimod are expected soon, and if they confirm ozanimod's efficacy, then a FDA filing should happen before the end of this year.

Celgene's also studying ozanimod in Crohn's disease and ulcerative colitis, and because those are blockbuster indications, that could push ozanimod's peak sales opportunity even higher. Idhifa, which is licensed from Agios , may offer an important new option for people who have seen their disease return. Overall, Celgene has nine late-stage research programs underway that could help it deliver on its lofty projections. Todd Campbell owns shares of Celgene. His clients may have positions in the companies mentioned.

The Motley Fool owns shares of and recommends Celgene, Paycom Software, and Shopify. The Motley Fool has a disclosure policy.

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Todd has been helping buy side portfolio managers as an independent researcher for over a decade. In , Todd founded E.

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