Short interest in the two-week period ending January 15 rose for all four of the 3D printing stocks we follow. Share price declines in a range of 8% to 14% for the two-week period, on top of even bigger drops in the prior period, seem to indicate that short sellers think the sector may be in for even more pressure.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 2.6% to 35.19 million shares. Some 33.4% of the company’s stock was short. The days to cover rose to 12. In the two-week short interest period, the share price fell about 11%. The stock’s 52-week range is $27.46 to $82.65, and shares closed at $29.31 on Tuesday.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise 4.4% in the first two weeks of January to 10.1 million shares, or about 23% of the company’s float. The days to cover rose to nine. Shares fell about 14% in the two-week period. The stock closed at $80.17 on Tuesday, and the 52-week range is $70.00 to $131.09.

Short interest in The ExOne Co. (NASDAQ: XONE) rose 3.1% to 3.74 million shares. About 39.7% of the company’s shares were short. Shares of ExOne dropped more than 14% in the two-week period. The stock’s 52-week range is $13.67 to $49.74, and the days to cover rose to 10.

Voxeljet A.G. (NYSE: VJET) saw short interest rise 7.8% to 2.26 million shares, with the days to cover rising to nine. Shares fell more than 8% in the period to January 15. The stock closed at $8.39 on Tuesday, in a 52-week range of $7.13 to $37.75.

ALSO READ: Short Sellers Run for Cover in Semiconductor Stocks

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