We have tracked the key short interest changes as of September 30 in the following 3D printer and services companies: 3D Systems Inc. (DDD), Stratasys Ltd. (SSYS), The ExOne Co. (XONE) and Proto Labs Inc. (PRLB).
Short interest in 3D Systems fell 2.7% to 27.08 million shares. Some 28.3% of the company’s stock is short.
Short interest in Proto Labs increased by 4.7% to 3.02 million shares, or 14.9% of the company’s float.
Stratasys saw short interest drop 8.5% in the final two weeks of September to 2.77 million shares, or about 8.5% of the company’s float.
Short interest in ExOne soared by 79.7% to 3.24 million shares. About 31.8% of the company’s shares are now held short.
The short sellers piled into ExOne in the latter two weeks of the month, following the stock’s initial rating of Underperform with a price target of $48 by Credit Suisse. An IPO filing earlier in September by Germany’s Voxeljet, a direct competitor to ExOne, likely added to the increased attention from short sellers.