24/7 Wall St.

Short interest during the two-week period ending March 15 rose on all four 3D printing stocks we follow. As of that date, all four stocks had posted a year-to-date gain, but through last Friday’s close, one has dropped to a small loss so far this year.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 3% to 21.49 million shares. Some 19.9% of the company’s float was short. Days to cover rose from seven to 10. In the two-week short interest period, the share price fell by about 14.6%. The stock’s 52-week trading range is $11.59 to $19.76, and shares closed at $14.17 on Friday, up about 0.3% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest jump by 17.1% in the first two weeks of March to about 4.96 million shares, or 10% of the company’s float. Days to cover fell from six to five. The share price retreated by 5.8% in the two-week period, and the stock closed at $19.19 on Friday, up about 0.2% on the day, in a 52-week range of $16.37 to $30.46.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 6.5% to 2.43 million shares. About 22.6% of the company’s shares were short. ExOne’s share price dropped about 5.2% in the two-week period. The stock’s 52-week range is $9.03 to $16.15, and shares closed at $10.01 on Friday, up 0.5% for the day. Days to cover rose from 16 to 17.

Short interest in Voxeljet A.G. (NYSE: VJET) increased by 2.8% to 532,569 American depositary shares, with days to cover remaining unchanged at 14. The share price fell by 4.9% in the two-week period to March 15. Voxeljet closed at $2.85 on Friday, up 1.4% for the day, in a 52-week range of $2.77 to $6.50. It is down about 1% for the year to date.