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. After all, some stocks are cheap for good reason. We asked some of our top contributors to highlight some of their favorite stocks that are on sale.

These companies cut across industries, but they all have two things in common. Each has catalysts ahead that can boost the top and bottom line, and their shares can be bought at a reasonable price.

Read on to see whether these companies may be right for your portfolio. BOFI is, though not without some reason. After all, the company has been subject to numerous allegations over the past year or so, for a variety of things ranging from illegal activity by the CEO to dirty dealings with its underwriting and appraisals, among a litany of other things.

Compounded, they've pushed the internet-only bank's stock down over half from its high and driven its price to book value multiple to levels of banks 70 times bigger:. BOFI Price to Book Value data by YCharts. BofI is a cost-efficient growth machine, and I don't buy the allegations, which, by the way, are all being pushed by anonymous bloggers with short positions and potentially very large short-selling financial backers. Don't get me wrong -- I'm not saying the allegations are false because the accusers are anonymous or short.

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I'm saying that it's reached a laughable point when the latest short thesis is that someone in the audit department left the company so there must be trouble. I'm just not buying it.

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Either the allegations are right or they're not, and it's very hard to imagine regulatory agencies ignoring a bank if there's this much bad stuff happening. To me that sounds like an excellent opportunity to take a calculated risk on a very undervalued growth dynamo. If you're willing to take on the risk, BofI shares are trading at an incredible discount for a company that's grown earnings like this over the past five years:. BOFI EPS Diluted TTM data by YCharts.

BIIB shares took it on the chin earlier this year when management reported that a once-promising multiple sclerosis drug had come up short in trials. While the news was disappointing, the significant drop in Biogen's shares may have created an opportunity for value-minded investors. Importantly, Biogen's cost-cutting is helping it transform more of its sales into earnings, and that's keeping its valuation in forex stop loss spread. That means investors can buy shares for less than 14 times this year's earnings.

Overall, because Biogen has best undervalued stocks to buy 2016 of the best balance sheets in biotech, a multibillion-dollar commitment to share buybacks, and double-digit difference between cash flow and retained earnings and bottom-line growth, it's one of my favorite undervalued growth stocks.

I think now is a fantastic time for investors to consider buying shares of Fitbit NYSE: And the market seems to be ignoring the fact that last quarter's results were strong enough to allow the company to increase its outlook for the remainder of the year -- albeit not enough to live up to Wall Street's near-term demands.

However, unlike many other traditional brokers that you're probably more familiar with, Interactive Brokers primarily caters to only highly active traders, such as hedge-fund managers and day-traders. These customers demand speed and low-cost execution since they trade frequently, black scholes model for put options on both fronts Interactive Brokers' platform stands head and shoulders above the rest of the crowd.

That's a big reason the company has been attracting new clients to its platform at double-digit rates for years. That's all great, and it makes the company highly profitable, but the brokerage business tends to be lumpy by nature.

In the most recent quarter we saw that lumpiness play best undervalued stocks to buy 2016, which is one reason the market hasn't been kind to this company's stock recently. Net revenue fell 4. In addition, Interactive Brokers' market-making business took a big haircut during the quarter. After all, this past quarter we saw customer accounts and customer equity both grow by double digits. On the surface, NXP Semiconductors NASDAQ: Growth companies are supposed to grow quickly, and NXP currently fails that test.

But the semiconductor industry is cyclical, with demand rising and falling based on a variety of factors.

NXP has no control over these ebbs and flows, and liffe options brokers the company can do is position itself for the eventual recovery.

With the acquisition of Freescale, NXP has made itself the largest provider of automotive semiconductor products in the world. With cars getting smarter and more connected, the long-term picture looks bright.

Analysts expect NXP's earnings can you buy fractional shares of stocks be roughly flat this year, with substantial growth returning in fiscal The analysts could be wrong, of course, as the downturn in demand may last longer than expected. Investors will need to be patient.

But with the stock trading for around 11 times expected earnings, NXP is a growth stock trading at an attractive price. Brian Feroldi has no position in any stocks mentioned. Jason Hall owns shares of BofI Holding. Jason Hall has the following options: Steve Symington has no position in any stocks mentioned. Timothy Green has no position in any stocks mentioned. Todd Campbell has no position in any stocks mentioned. The Motley Fool owns shares of and recommends Biogen, BofI Holding, and NXP Semiconductors.

The Motley Fool recommends Fitbit and Interactive Brokers. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

Todd has been helping buy side portfolio managers as an independent researcher for over a decade. InTodd founded E. Capital Markets, LLC, a research firm providing action oriented ideas to professional investors.

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