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What happened 

Shares of 3D Systems Corporation (DDD 5.03%) jumped as much as 17.2% in trading Monday after buyout rumors swirled around the market. At 3:00 p.m. EST, shares were still up 16.2% for the day. 

So what

The rumor is that General Electric (GE -1.80%) has approached 3D Systems about a buyout, and the company in turn hired an investment banker to look into the deal. These are just rumors, but there's often some nugget of truth in rumors like this, whether a deal comes to fruition or not. 

We don't know what's true about GE's potential interest in 3D Systems, but we do know that GE is a big consumer of 3D-printed parts and spent $1.4 billion buying metal 3D printer companies last year. With a goal of generating $1 billion in 3D revenue by 2020, GE could see 3D Systems as an ideal target. 

Now what

Buying a stock on rumor alone isn't a good idea, because the pop can burst if the rumors don't out to be true. But if you're an owner of 3D Systems, this is a nice pop in the stock today, and if the rumor turns out to be true, there could be further upside. 

It'll be worth watching what both companies have to say about this rumor in the next few days because they'll likely have to respond. That will give us an idea of whether or not 3D Systems or GE is interested in a deal, but until then, trading on this rumor is risky business.