Investors love to see sales growth in their companies as a growing top line tends to correlate with rising profits. When revenue is skyrocketing, though, it could point to more than just a short-term pop in earnings.

A business with sharply rising sales might be disrupting a new industry niche, for example, or soaking up market share from stunned rivals. Situations like these could make the stock an attractive long-term bet.

With that in mind, let's look at three companies, LendingTree (NASDAQ:TREE), Shopify (NYSE:SHOP), and Winnebago (NYSE:WGO), that are on pace to boost sales by 50% or more this year.

LendingTree

Many things are going right for LendingTree right now. Steady improvement in the housing market is helping its core mortgage product sales spike. The online lending giant also managed to more than double its non-mortgage revenue, which includes things like personal loans, credit cards, and home equity loans, last quarter. Recent acquisitions like CompareCards played a big role in pushing overall revenue higher by 51% over the past six months, too. 

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CEO Gabe Doug Lebda and his executive team are targeting sales of between $580 million and $590 million this year, which would represent growth of between 51% and 53%. The good news is that, since these gains are being powered by non-mortgage lending, they're helping the company diversify its revenue stream. On the other hand, non-mortgage loan categories are unsecured, so they are raising the overall risk profile on LendingTree's debt portfolio.

Shopify

Shopify helps companies do business online. And given that consumers are increasingly passing on trips to the mall in favor of shopping from home, the e-commerce platform is ideally positioned for growth.

Sales soared 75% last quarter as the volume of business transactions jumped to $5.8 billion from $2.5 billion just a year ago. Gross profit expanded at an even faster pace, rising 83%. Executives credited the company's ability to capitalize on a few concurrent trends in the industry. "The fundamental shift in retail toward multi-channel and mobile, the ongoing adoption of Shopify by larger brands, and our continued focus on building out the market-leading platform for sellers," Chief Financial Officer Russ Jones told investors in early August, "all contributed to the strength of our results." 

Shopify will need to continue anticipating market shifts even as competitive threats pour into this quickly growing industry. Many far larger companies will be looking to elbow in on its industry over the next few years, but shareholders are hoping that its early lead will mature into a huge, well-defended sales base before rivals can catch up.

Winnebago

The recreational vehicles market is inching higher at just a 3% pace this year, but Winnebago is enjoying much faster growth. In fact, the RV specialist's sales are up 53% over the past nine months. Winnebago achieved that result mostly thanks to an expensive acquisition, having recently closed on a deal to fold General Design and its $428 million of annual revenue into its operations.

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Image source: Getty Images.

Executives had predicted that the merger would immediately boost the overall business -- and they were right. Revenue jumped 75% last quarter as gross profit margin soared to 14.9% of sales from 11.1% a year ago. 

Winnebago's shifting focus toward towable RVs should continue boosting its profitability. Its new, much larger scale, meanwhile, will be a huge asset as it works to fill out the holes in its portfolio. The buyout saddled the company with an elevated debt burden, unfortunately, but management is aiming to pay that down rapidly so that its leverage rate returns to normal by the end of next year.

Investors have rewarded each of these stocks with market-thumping price gains so far in 2017. That rally increases the risk that shares will slump if operating results fail to live up to Wall Street's high expectations. But it also reflects sharply improving operating trends that have the potential to create far more profitable businesses over the long term.

Demitrios Kalogeropoulos has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Shopify. The Motley Fool has a disclosure policy.