Short interest fell during the two-week reporting period ending October 15 on three of four 3D printing stocks we follow. Trading action was mixed, with days to cover rising on two of the four stocks and falling on the others.

Short interest in 3D Systems Corp. (NYSE: DDD) decreased by 4.1% to 25.02 million shares in the two-week reporting period that ended October 15. Some 22.7% of the company’s float was short. Days to cover rose from 13 to 14. In the short interest period, the share price fell by 9.9%. The stock’s 52-week trading range is $7.92 to $21.78, and shares closed at $17.44 on Wednesday, up about 4.5% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 5.2% in the first two weeks of October to about 7.57 million shares, or 15.1% of the company’s float. Days to cover fell from 20 to 18. The share price retreated by 12% in the period, and the stock closed at $19.79 on Wednesday, down about 3.3% for the day, in a 52-week range of $17.17 to $26.17.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 7.4% to 2.59 million shares. About 26.6% of the company’s shares were short. ExOne’s share price dropped by about 2% in the period ending October 15. The stock’s 52-week range is $6.16 to $12.50, and shares closed at $6.91 on Wednesday, down about 1.7% for the day. Days to cover fell from 20 to 11.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 7.4% to 275,737 American depositary shares, with days to cover rising from six to nine. Voxeljet dropped about 14.5% for the two-week period and closed at $2.30 on Wednesday, down more than 6% for the day, in a 52-week range of $2.30 to $5.73. The low was posted yesterday.

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