Short interest during the two-week period ending October 31 rose on three of the four 3D printing stocks we follow. Share prices got a recent boost from reports that demand for additive manufacturing is rising, so short sellers have taken advantage of what they see as an opportunity.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 12.4% to 27.72 million shares. Some 26.1% of the company’s float was short. Days to cover rose from eight to 11. In the two-week short interest period, the share price fell by about 6.4%. The stock’s 52-week trading range is $6.00 to $19.76, and shares closed at $13.77 on Wednesday, up about 1.6% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 10.6% in the final two weeks of October to about 6.92 million shares, or 14.2% of the company’s float. Days to cover rose from eight to 10. The share price fell by about 9.9% in the two-week period, and the stock closed at $19.62 on Wednesday, up about 3.1% on the day, in a 52-week range of $14.48 to $30.46.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 8.9% to 2.35 million shares. About 25% of the company’s shares were short. ExOne’s share price fell by nearly 12% in the two weeks. The stock’s 52-week range is $6.50 to $16.15, and shares closed at $11.72 on Wednesday, up about 6.6% for the day. Days to cover rose from 11 to 17.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 2.5% to 581,328 American depositary shares, with days to cover rising from 10 to 14. The share price rose by about 1.8% in the settlement period. Voxeljet closed at $4.31 on Wednesday, up about 4.9% for the day, in a 52-week range of $3.50 to $6.50.

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