Short interest during the two-week period ending January 15 rose on all four 3D printing stocks we follow. Share prices for all four stocks fell by at least 12% during the two-week period, worse than the 9% drop in the S&P 500 index.

With the exception of the Voxeljet, which trades American depositary shares, short interest in the 3D stocks runs right around one-third of the stock’s float.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 4.5% to 35.24 million shares. Some 33.4% of the company’s float was short. Days to cover remained unchanged at nine. In the two-week short interest period to January 15, the share price fell nearly 20%. The stock’s 52-week range is $6.00 to $33.17, and shares closed at $7.67 on Wednesday, up about 3.2% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 1.2% in the first two weeks of January to about 11.43 million shares, or about 23.6% of the company’s float. Days to cover slipped from 12 to 10. The share price fell by about 22% in the short interest period, and the stock closed at $16.12 on Wednesday, down less than 0.1% on the day, in a 52-week trading range of $14.88 to $81.00.

Short interest in ExOne Co. (NASDAQ: XONE) rose 11.8% to 2.5 million shares. About 32.8% of the company’s shares were short. ExOne’s share price fell 23% in the two-week period. The stock’s 52-week range is $5.81 to $17.79, and shares closed at $7.55 on Wednesday, down about 1.2% for the day. Days to cover remained unchanged at six.

Short interest in Voxeljet A.G. (NYSE: VJET) increased by 6.1% to 1.14 million ADSs, with days to cover rising from nine to 12. The stock price fell by about 12% in the two-week period to January 15. The ADSs closed at $4.25 on Wednesday night, up about 2.2% for the day, in a 52-week range of $3.50 to $10.75.

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