Short interest during the two-week period ending April 15 fell on three 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 1.4% to as much as 14%. Short sellers continued to give the sector a pass as share prices marched higher.

Analyst downgrades on April 14 took a lot of the wind out of these stocks’ sails, slashing prior gains of 12% to nearly 19% in just a single day of trading.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 10.1% to 25.03 million shares. Some 23.9% of the company’s float was short. Days to cover fell from eight to five. In the two-week short interest period, the share price rose by about 11.5%. The stock’s 52-week range is $6.00 to $25.64, and shares closed at $18.00 on Tuesday, down about 1.9% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 13% in the first two weeks of April to about 7.2 million shares, or 14.9% of the company’s float. Days to cover fell from eight to five. The share price rose by about 1.4% in the two-week period and the stock closed at $26.00 on Tuesday, up about 0.7% on the day, in a 52-week range of $14.48 to $43.20.

Short interest in ExOne Co. (NASDAQ: XONE) fell 10.1% to 1.84 million shares. About 20.1% of the company’s shares were short. ExOne’s share price rose by 2.2% in the two-week period. The stock’s 52-week range is $5.81 to $14.75 and shares closed at $13.969 on Tuesday, up about 6.7% for the day. Days to cover rose from five to six.

Short interest in Voxeljet A.G. (NYSE: VJET) increased by 7% to 882,000 American depositary shares (ADSs), with days to cover falling from nine to six. The share price rose by 14% in the two-week period to April 15. The ADSs closed most recently at $6.03, up about 2.9% for the day, in a 52-week range of $3.50 to $8.72.

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