Short interest in the two-week period ending September 15 fell for two of the four 3D printing companies we follow and rose for the other two. Share prices at all four have posted year-to-date declines, and only one stock trades within sight of its 52-week high. These stocks are not trading as heavily as they once were either. Days to cover rose for all the 3D printing stocks.

Short interest in 3D Systems Corp. (NYSE: DDD) fell 2.5% to 35.77 million shares. Some 34.3% of the company’s stock is short. Days to cover rose to 14. In the two-week short interest period, the share price fell more than 6% and is down more than 47% for the year to date as of Wednesday’s close at $49.54. The stock’s 52-week range is $43.35 to $97.28.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise 4.5% in the first two weeks of September to 6.53 million shares, or about 15% of the company’s float. Days to cover now stands at six. Shares rose 3.2% in the two-week period, closed at $124.41 Wednesday night and have dropped about 7.2% for the year to date. The stock’s 52-week range is $85.30 to $138.10. An analyst downgrade in early September probably spiked the rise in short interest.

Short interest in The ExOne Co. (NASDAQ: XONE) rose about 3,0% to 4.62 million shares. About 51% of the company’s shares are now held short. Shares of ExOne fell more than 12% in the two-week period and closed at $24.82 Wednesday, down about 60% year to date. The stock’s 52-week range is $24.34 to $70.25, and days to cover rose to nine.

Voxeljet A.G. (NYSE: VJET) saw short interest fall 1.0% to 2.9 million shares, with a days to cover number of eight. Since coming public at $19 in mid-October last year, the share price is down about 45%. Year to date, shares are down nearly 64%, and they fell 9% in the two-week period to September 15. The stock closed at $15.80, in a post-IPO range of $12.85 to $70.00.

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