Short interest rose yet again in the two-week period ending August 15 for three of four of the 3D printing companies we follow. Share prices fell at the same three companies during the period, and all four have posted year-to-date declines.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 2.2% to 36.88 million shares. Some 35.4% of the company’s stock is short. Days to cover rose to 12. In the two-week short interest period, the share price fell more than 2%, and it is down more than 45% for the year to date as of Tuesday’s close. The stock’s 52-week range is $43.35 to $97.28, and shares closed at $51.44 Tuesday.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall 8.3% in the first two weeks of August to 6.29 million shares, or about 13.7% of the company’s float. Days to cover fell to four. Shares rose about 8.6% in the two-week period. Shares closed at $115.94 Tuesday night and have dropped about 13.5% 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 about 7.9% to 4.33 million shares. About 55% of the company’s shares are now held short. Shares of ExOne fell more than 15% in the two-week period and closed at $28.66 Tuesday night, down year-to-date about 54%. The stock’s 52-week range is $24.34 to $72.88, and the days to cover rose to seven.

Voxeljet A.G. (NYSE: VJET) saw short interest rise 6.2% to 3.06 million shares, with a days to cover number of five. Since coming public at $19 in mid-October, the share price is down about 40%. Year to date, shares are down about 60%, and they fell nearly 16% in the two-week period. The stock closed at $17.26, in a post-IPO range of $12.85 to $70.00.

ALSO READ: Stocks With the Largest Short Interest

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