Short interest during the two-week period ending January 29 fell on all four 3D printing stocks we follow. Share prices for three of the four stocks fell during the two-week period, ranging from a drop of around 3% to around 15%, worse than the 1% increase in the S&P 500 index. The one stock that rose during the two-week period jumped nearly 8%. None of these companies has yet reported quarterly results.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 4.7% to 33.6 million shares. Some 31.8% of the company’s float was short. Days to cover rose from nine to 11. In the two-week short interest period, the share price rose about 7.7%. The stock’s 52-week range is $6.00 to $33.17, and shares closed at $8.51 on Tuesday, down about 0.8% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 6.7% in the last two weeks of January to about 10.66 million shares, or about 22% of the company’s float. Days to cover fell from 10 to six. The share price fell by nearly 15% in the two-week period, and the stock closed at $15.94 on Tuesday, down about 0.9% on the day, in a 52-week range of $14.88 to $67.75.

Short interest in ExOne Co. (NASDAQ: XONE) fell 5.5% to 2.37 million shares. About 26.1% of the company’s shares were short. ExOne’s share price fell nearly 10% in the two-week period. The stock’s 52-week range is $5.81 to $17.79, and shares closed at $7.73 on Tuesday, down about 2.2% for the day. Days to cover rose from six to 11.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 5.2% to 1.08 million American depositary shares (ADSs), with days to cover rising from 12 to 18. The stock price fell by about 3.3% in the two-week period to January 29. The ADSs closed at $4.05 on Tuesday, down 1.7% for the day, in a 52-week range of $3.50 to $10.75.

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