The market exchanges may have posted reasonable returns in 2012, but this doesn't mean that all investors were simply running in place.

There are actually several stocks that have been killing it this year, and reading into the things that went right for them in 2012 may help you identify the traits in the stocks that will more than double in 2013.

Let's go over five of this year's biggest winners.


Arena Pharmaceuticals : up 368%
Most people will tell you that they can afford to lose a few pounds, and not just this time of year when we all tend to put on a little more weight over the holidays.

Arena's been there, and it's back with a potential cure.

When the Food and Drug Administration approved marketing of Arena's weight-loss drug lorcaserin -- the first anti-obesity medication to receive regulatory approval since 1999 -- investors flocked to the stock.

Arena's still losing money, and there are other companies with potentially promising treatments on the way. However, the appeal of Arena as it cashes in on a country full of love handles if it's not acquired outright has been too tempting to ignore this year.

3D Systems : up 260%
There are few things as exciting as 3-D printing. The ability to print out actual objects -- from auto parts to artificial limbs -- makes this a game-changing niche that investors need to keep watching.

Yes, the easy money's been made. 3-D printing leader 3D Systems saw its stock more than triple this year, but that came after being largely ignored in last year's IPO.

3D Systems may not seem cheap at 33 times forward earnings, but the upside growth of 3-D printing is going to keep the shares at a healthy market premium for some time.

Vringo :  up 192%
Vringo began the year as an obscure app developer. Its biggest app was a video ringtone program, hence the corporate moniker.

However, things got interesting here after it acquired some old Lycos patents related to the way that ads are targeting search histories. Vringo turned around and started suing online juggernauts that seemed to be trampling on its freshly acquired intellectual property.

Vringo didn't get the payday it was originally hoping to score. A district court judge limited the company's potential damages in its patent infringement suit. However, Vringo still closed out the year with lucrative decisions in place.

Lumber Liquidators :  up 191%
It's been a great year for homebuilders. There have been several real estate developers that have seen their shares more than double.

However, the residential realty market stabilizing has also opened the door for companies that help with home improvement projects. Lumber Liquidators is the leading stand-alone retailer of hardwood flooring.

Low prices draw in homeowners, and now the appeal is clear with home prices on the way up. Folks hoping to improve the quality of their homes through hardwood planks no longer have to worry about freefalling home prices taking their mortgages underwater.

Lumber Liquidators has blown past Wall Street's profit targets in each of this year's first three quarters. The market obviously likes to see that happen.

Conn's :  up 171%
You don't often see a stock that doubled one year come back with another triple-digit return, but that's just what happened with Conn's.

The consumer electronics retailer turned heads last year with its 137% ascent, and this time it rose by even more.

Investors tend to think of Best Buy or the skeletal remains of Circuit City when they think about consumer electronics, but that isn't what Conn's is about. Conn's emphasis on appliances, furniture, mattresses, and even lawn care equipment has helped it stand out with large big-ticket items that can't be easily fulfilled by online retailers.

What the future holds
Few figured that selling hardwood flooring or lawn mowers or high-end printers would be the ticket to market-thumping returns in 2012. Right now, 
3D Systems is at the leading edge of a disruptive technological revolution, with the broadest portfolio of 3-D printers in the industry. However, despite years of earnings growth, 3D Systems' share price has risen even faster, and today the company sports a dizzying valuation. To help investors decide whether the future of additive manufacturing is bright enough to justify the lofty price tag on the company's shares, The Motley Fool has compiled a premium research report on whether 3D Systems is a buy right now. In our report, we take a close look at 3D Systems' opportunities, risks, and critical factors for growth. You'll also find reasons to buy or sell, and receive a full year of analyst updates with the report. To start reading, simply click here now for instant access.

The article 5 Stocks That More Than Doubled in 2012 originally appeared on Fool.com.

Longtime Fool contributor Rick Aristotle Munarriz has no positions in the stocks mentioned above. The Motley Fool owns shares of 3D Systems and Lumber Liquidators and has the following options: short JAN 2014 $55.00 calls on 3D Systems and short JAN 2014 $30.00 puts on 3D Systems. Motley Fool newsletter services recommend 3D Systems and Lumber Liquidators. 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.

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joelliebesfeld

Investors should understand that if taking a pill can cure a disease, then a pill it is. Well then, if taking a pill can help one lose weight, then definitely a pill it is!! Further this pill appears to be the safest in its class of meds. With that said, with a positive FED announcement pending, with European approval likely, I see a 50% rise (or better) in stock price in 2013.

December 28 2012 at 8:30 AM Report abuse rate up rate down Reply