Short interest during the two-week period ending May 15 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 50% to around 90%.

Short interest in 3D Systems Corp. (NYSE: DDD) slipped by 2.5% to 25.05 million shares. Some 23% of the company’s float was short. Days to cover remained unchanged at five. In the two-week short interest period, the share price rose by about 43.3%. The stock’s 52-week trading range is $11.59 to $23.70, and shares closed at $22.55 on Wednesday, up about 0.8% on the day. Shares have gained nearly 70% since the beginning of the year.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 13.9% in the first two weeks of May to about 6.04 million shares, or 13.9% of the company’s float. Days to cover remained at five. The share price rose by nearly 13% in the two-week period and the stock closed at $28.05 on Wednesday, down about 0.7% on the day, in a 52-week range of $16.37 to $30.88. Shares are up nearly 70% year to date.

Short interest in The ExOne Co. (NASDAQ: XONE) fell by 3.2% to 2.26 million shares. About 21% of the company’s shares were short. ExOne’s share price rose by about 38% in the period. The stock’s 52-week range is $9.08 to $16.15, and shares closed at $13.96 on Wednesday, down about 0.8% for the day. Days to cover fell from 16 to eight. The share price is up nearly 50% for the year to date.

Short interest data for Voxeljet A.G. (NYSE: VJET) was not available. The American depositary shares closed at $5.47 on Wednesday, up about 4.2% for the day, in a 52-week range of $2.61 to $5.72. Voxeljet is up more than 90% for the year to date.

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