These 3 Stocks Shot Up 100% in 2017 -- Are They Still Buys?

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2017 was a great year for investors, with the S&P 500 gaining 19.4% and the Dow Jones Industrial Average up 25%. However, investors in First Solar, Inc. (NASDAQ: FSLR), KB Home (NYSE: KBH), and Sangamo Therapeutics Inc. (NASDAQ: SGMO) did even better. First Solar and KB Home shares were up 110% and 102%, respectively, while Sangamo Therapeutics investors captured an incredible 438% in gains last year.

But what about now? Should investors put them at the top of their "buy" lists today? We asked three Motley Fool investors with the knowledge to break down the case for all three, and here are their insights.

Man with a surprised look holds a toy rocket that is starting to launch.
Man with a surprised look holds a toy rocket that is starting to launch.

Image source: Getty Images.

A solar leader for the long term

Jason Hall (First Solar): Shares of solar panel maker First Solar did more than double in 2017, finishing the year up 110%. Even with this incredible run, I think investors with a long-term outlook -- and the willingness to hold for multiple years -- should do very well to buy First Solar now.

What makes First Solar worth buying at a price that's so close to its recent peak? In short, as solar becomes a bigger and bigger part of the global energy mix, First Solar is one of the best companies in the industry to profit. It has been a technology leader for years, with its thin-film panels giving it an edge in large-scale solar projects, and has the resources to remain a leader.

First Solar has almost $3 billion in cash and less than $400 million in debt, while nearly all of its panel-making competitors have far more debt than cash:

FSLR Cash and Short Term Investments (Quarterly) Chart
FSLR Cash and Short Term Investments (Quarterly) Chart

FSLR cash and short-term investments (quarterly). Data by YCharts.

In a highly cyclical industry like solar, it's hard to overstate the importance of a strong balance sheet. But it's more than just the cash: That's a reflection of how effectively First Solar management has allocated capital.

There's no promise that First Solar's stock will go up in 2018, much less double like 2017. But looking years into the future, investing in the strongest, best-run solar panel maker out there should generate positive returns for shareholders -- even at current prices.

Pass on the "other" gene-editing pioneer (for now)

Maxx Chatsko (Sangamo Therapeutics): While the use of CRISPR systems as a gene-editing tool is taking the investing world by storm, investors have also noticed that Sangamo Therapeutics is positioning itself within the same discussion. That's because the biopharma aims to use zinc finger nucleases (ZFN) instead of CRISPR to alter the genetic sequences of patients.

Although the technology has been around for quite some time, it's been granted new life thanks to several partnering agreements in the gene-editing space. In fact, Sangamo Therapeutics owns the distinction of being the first company to bring a gene-editing trial into the clinic. That, and a partnership with Pfizer, had a lot to do with the stock's 438% rise in 2017. This year, the company went even further and linked up with Gilead Sciences. Does that make the stock a buy?