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Short interest during the two-week period ending October 31 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 11.3% to 32.12 million shares. Some 29.4% of the company’s float was short. Days to cover fell from 13 to 12. In the two-week short interest period, the share price fell by about 5.6%. The stock’s 52-week trading range is $8.09 to $23.70, and shares closed at $8.66 on Thursday, down about 2.3% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 14.1% in the last two weeks of October to about 7.1 million shares, or 14.2% of the company’s float. Days to cover fell from eight to six. The share price fell by about 2.5% in the two-week period, and the stock closed at $20.80 on Thursday, down nearly 2% on the day, in a 52-week range of $16.37 to $30.88.

Short interest in ExOne Co. (NASDAQ: XONE) fell by 2.1% to 2.01 million shares. About 21.5% of the company’s shares are now short. ExOne’s share price increased by about 2.7% in the period. The stock’s 52-week range is $6.72 to $14.43, and shares closed at $10.00 on Thursday, down about 1.7% for the day. Days to cover rose from 15 to 23.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 0.3% to 570,587 American depositary shares, with days to cover rising from six to eight. Voxeljet dropped about 2.9% for the two-week period and closed at $4.77 on Thursday, unchanged in a 52-week range of $2.61 to $6.37. The company reported third-quarter earnings this morning and shares have shot up by 10% in Friday’s premarket session.

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