Short interest in the two-week period ending October 15 rose for all four 3D printing companies we follow. Year-to-date share price declines, with one exception, are 60% or more. During this reporting period, share prices fell further, and as short interest keeps increasing, it seems pretty clear that short sellers haven’t spotted the bottom yet.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 0.2% to 33.7 million shares. Some 32.3% of the company’s stock is short. Days to cover slipped to 11. In the two-week short interest period to October 15, the share price fell 12.5% and is down about 60% for the year to date as of Friday night’s close. The stock’s 52-week range is $36.17 to $97.28, and shares ended last week at $37.07.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise 5.2% in the first two weeks of October to 5.79 million shares, or about 13.3% of the company’s float. Days to cover is unchanged at five. Shares fell about 6.8% in the two-week period. They closed at $117.53 on Friday and have dropped nearly 13% for the year to date. The stock’s 52-week range is $85.30 to $138.10.

Short interest in The ExOne Co. (NASDAQ: XONE) rose 10.5% to 4.96 million shares, and the days to cover fell to six. About 54.6% of the company’s shares are now short. Shares of ExOne fell about 6.7% in the two-week period and closed at $21.21 on Friday night, down about 65% year to date. The stock’s 52-week range is $16.00 to $70.25.

Voxeljet A.G. (NYSE: VJET) saw short interest rise 7.4% to 3.07 million shares, with days to cover falling to 10. Since coming public at $19 in mid-October last year, the share price is down about 55%. Year to date, shares are down about 67%, and they fell nearly 16% during the short interest period. The stock closed at $12.92 last week, in a 52-week range of $11.51 to $70.00.

ALSO READ: Analyst Steps Into the Middle of the 3D Printing Vortex

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