Short interest during the two-week period ending February 29 fell on all four 3D printing stocks we follow. Share prices for three of the four stocks rose during the two-week period, ranging from a drop of around 2% to a gain of about 22%. Only one of these companies has yet reported quarterly results.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 8.5% to 28.3 million shares. Some 26.8% of the company’s float was short. Days to cover fell from 10 to nine. In the two-week short interest period, the share price rose by nearly 22%. The stock’s 52-week range is $6.00 to $32.88, and shares closed at $11.89 on Wednesday, up about 1% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 17.2% in the last two weeks of February to about 8.25 million shares, or about 17.1% of the company’s float. Days to cover increased from nine to 11. The share price rose by about 21.5% in the two-week period and the stock closed at $25.44 on Wednesday, up about 2.2% on the day, in a 52-week range of $14.48 to $62.58. When Stratasys reported earnings last week, the good results pulled up the entire sector. Then on Monday JPMorgan downgraded it from Neutral to Underweight and stalled the upward trend.

Short interest in ExOne Co. (NASDAQ: XONE) fell 6.2% to 2.2 million shares. About 24.4% of the company’s shares were short. ExOne’s share price rose more than 7% in the two-week period. The stock’s 52-week range is $5.81 to $15.97, and shares closed at $11.06 on Wednesday, down nearly 2% for the day. Days to cover fell from 19 to 15.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 9.7% to 960,000 American depositary shares, with days to cover falling from 27 to 18. The share price fell by 2% in the two-week period to February 29. The stock closed at $5.00 on Wednesday, down about 3.3% for the day, in a 52-week range of $3.50 to $9.35.

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