Short interest during the two-week period ending March 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 9% to about 22%. Three of the four have already reported last quarter’s earnings, and the results were generally better than expected. The sharp share price increases have boosted volume in the stocks as well, with days to cover falling for all four stocks.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 5.7% to 29.91 million shares. Some 28.3% of the company’s float was short. Days to cover fell from nine to five. 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 $14.76 on Thursday, up about 2.2% on the day. Shares closed above $15 on March 21, the first time the stock has closed that high since late in July 2015.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 2.6% in the first two weeks of March to about 8.03 million shares, or about 16.6% of the company’s float. Days to cover fell from 11 to three. The share price rose by about nearly 18% in the two-week period, and the stock closed at $23.80 on Thursday, up about 2.4% on the day. The 52-week trading range is $14.48 to $62.58.

Short interest in The ExOne Co. (NASDAQ: XONE) fell 1.4% to 2.17 million shares. About 24% of the company’s shares were short. ExOne’s share price rose more than 16% in the two weeks. The stock’s 52-week range is $5.81 to $15.97, and shares closed at $12.55 on Thursday, up about 3.6% for the day. Days to cover fell from 15 to six.

Voxeljet A.G. (NYSE: VJET) short interest decreased by 15.3% to 813,000 American depositary shares (ADSs), with days to cover falling from 18 to nine. The share price rose by about 9.4% by mid-March. The ADSs closed most recently at $5.35, up about 0.1% for the day, in a 52-week range of $3.50 to $9.35.

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