Short interest during the two-week period ending May 31 rose on just one of four 3D printing stocks we follow. As of that date, the four stocks had posted year-to-date gains ranging from around 40% to about 85%.

Short interest in 3D Systems Corp. (NYSE: DDD) dropped by 7.4% to 23.20 million shares. Some 21% of the company’s float was short. Days to cover ticked up to six. In the two-week short interest period, the share price pulled back by about 10%. The stock’s 52-week trading range is $11.59 to $23.70, and shares closed at $20.05 on Friday, down 5.5% on the day. Shares have gained less than 54% since the beginning of the year.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 12.7% in the final two weeks of May to about 5.28 million shares, or 10.7% of the company’s float. Days to cover dropped from five to three. The share price retreated by around 10% in the two-week period and the stock closed most recently at $26.51, down about 6.5% on the day, in a 52-week range of $16.37 to $30.88. Shares are up more than 62% year to date.

Short interest in The ExOne Co. (NASDAQ: XONE) fell by 0.6% to 2.27 million shares. About 21% of the company’s shares were short. ExOne’s share price ended the period where it started. The stock’s 52-week range is $9.08 to $16.15, and shares closed at $13.14 on Friday, down about 5.5% for the day. Days to cover rose from eight to 10. The share price is up almost 41% for the year to date.

Short interest data for Voxeljet A.G. (NYSE: VJET) jumped 32.6% to 747,748 shares. The American depositary shares closed at $5.75 on Friday, down about 0.8% for the day, in a 52-week range of $2.61 to $6.00. Voxeljet is up about 85% for the year to date.

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