Short interest during the two-week period ending March 31 fell on two of four 3D printing stocks we follow. Share prices for all four stocks rose during the two-week period, ranging from a gain of around 3% to as much as 14%. Over the past 30 days, 3D printing firms have gotten share price bumps of more than 20%, with 3D Systems jumping more than 30%. Short sellers are giving the industry a pass for now.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 6.9% to 27.85 million shares. Some 26.6% of the company’s float was short. Days to cover rose from five to eight. In the short interest period, the share price rose by about 7%. The stock’s 52-week trading range is $6.00 to $32.88, and shares closed at $16.49 on Monday, up about 4.5% on the day. Shares closed above $16 on April 6, the first time the stock has closed that high since mid-July 2015.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 3% in the last two weeks of March to about 8.27 million shares, or 17.1% of the company’s float. Days to cover rose from three to eight. The share price rose by about 3% in the period, and the stock closed at $27.06 on Monday, up about 2.1% on the day, in a 52-week range of $14.48 to $62.58.

Short interest in The ExOne Co. (NASDAQ: XONE) fell 5.6% to 2.05 million shares. About 22.4% of the company’s shares were short. ExOne’s share price rose more than 9% in the two-week period. The stock’s 52-week range is $5.81 to $15.97, and shares closed at $13.39 on Monday, up about 0.9% for the day. Days to cover fell from six to five.

Short interest in Voxeljet A.G. (NYSE: VJET) increased by 1.4% to 824,000 American depositary shares (ADSs), with days to cover remaining unchanged at nine. The share price rose by more than 14% in the period to March 31. The ADSs closed most recently at $5.85, down about 1.2% for the day, in a 52-week range of $3.50 to $9.15.

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