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Short interest during the two-week period ending December 15 rose on two of four 3D printing stocks we follow. The shares of all four companies continue to pull back from 2017 highs posted in May.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 0.3% to 36.81 million shares. Some 33.8% of the company’s float was short. Days to cover remained at 12. In the two-week short interest period, the share price rose by about 16.8%. The stock’s 52-week trading range is $7.92 to $23.70, and shares closed at $9.03 on Wednesday, down about 1.3% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 1.8% in the first two weeks of December to about 9.82 million shares, or 19.6% of the company’s float. Days to cover rose to 16. The share price increased by about 1.9% in the two-week period, and the stock closed at $20.51 on Wednesday, up about 0.3% on the day, in a 52-week range of $16.37 to $30.88.

Short interest in The ExOne Co. (NASDAQ: XONE) fell by 9.3% to 1.96 million shares. About 20.9% of the company’s shares are now short. ExOne’s share price plunged by 22% in the period. The stock’s 52-week range is $6.72 to $14.43, and shares closed at $9.07 on Wednesday, up about 1.3% for the day. Days to cover fell to 12.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 6.9% to 521,363 American depositary shares, with days to cover rising to 12. Voxeljet added about 0.6% for the two-week period and closed at $4.97 on Wednesday, up 0.2% in a 52-week range of $2.61 to $6.37.

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