Ok. What's happening is the usual speculation. Thanks to makerbot and the DIY community personal 3d printing become a hot topic. It all started around 2010 but went overboard this year.

Look at the numbers. Both DDD and SSYS are companies with solid balance sheet and positive cash flow. They are growing organically.

However not as fast as the current stock price movement would suggest.

When the headlines are all about how 3D printing is such a disruptive technology, the next trillion dollar business and all.. Then expectations can get ahead of themselves.

What you see is a simple correction of investor sentiment. I bought in at 26 this year. Never expected it to go over 40 within a few month. I mean did you see anything "material" that would prompt the stock to go this high this fast? Because I didn't.