Short interest in the two-week period ending January 30 rose for three of four of the 3D printing stocks we follow. Share price changes for the year to date fall in a range of negative 23% to a positive 7.6%. Compared with the prior two-week period, the increases are modest, but with shorts holding more than a third of one company’s stock and 40% of another’s, the sector seems destined for continued lows.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 3.2% to 36.33 million shares. Some 34.5% of the company’s stock is short. Days to cover rose to more than 12. In the two-week short interest period to January 30, the share price fell about 2.1%. The stock’s 52-week range is $27.00 to $82.65, and shares closed at $29.77 on Tuesday.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise 4.9% in the last two weeks of January to 10.59 million shares, or about 22.3% of the company’s float. Days to cover rose to more than 10. Shares rose about 8.6% in the two-week period. The stock closed at $63.88 on Tuesday, and the 52-week range is $51.55 to $131.09.

Short interest in The ExOne Co. (NASDAQ: XONE) rose fractionally to 3.75 million shares. About 40% of the company’s shares were short. Shares of ExOne dropped about 2.3% in the two-week period. The stock’s 52-week range is $13.40 to $48.80, and shares ended Tuesday at $15.82. Days to cover rose to nearly 14.

Voxeljet A.G. (NYSE: VJET) saw short interest fall 3.5% to 2.18 million shares, with days to cover slipping to almost seven. Shares rose nearly 11% in the period. The stock closed at $8.74 on Tuesday night, in a 52-week range of $7.13 to $37.49.

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