Short interest during the two-week period ending June 15 came in mixed on the four 3D printing stocks we follow. Over the course of the past 12 months, all four stocks have dropped more than 50%, and three are down more than 60%. Still, investors continue to be willing to raise their bets that the bottom is not in sight, at least for two of the stocks. For those two stocks, though, days to cover rose, which indicates that the market might be looking elsewhere for some short selling action.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 1.7% to 35.64 million shares. Some 33.6% of the company’s float is short. Days to cover rose from 14 to 22. In the two-week short interest period to June 15, the share price fell about 5%. The stock’s 52-week range is $20.39 to $69.56, and shares closed at $20.53 on Wednesday, down more than 5% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 6.1% in the first two weeks of June to about 11.08 million shares, or about 24.7% of the company’s float. Days to cover rose from eight to nine. The share price fell about 0.5% in the two-week period. The stock closed at $37.74 on Wednesday, down about 3% on the day, and the 52-week range is $33.85 to $130.83.

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Short interest in ExOne Co. (NASDAQ: XONE) fell 3.8% to 2.98 million shares. About 32.8% of the company’s shares are now short. ExOne’s share price  fell about 1.7% in the two-week period. The stock’s 52-week range is $11.86 to $48.66, and shares closed at $12.63 on Tuesday, down about 1% for the day. Days to cover slipped from 23 to 21. The company reported its quarterly earnings on June 11, and the shares dropped more than 6%.

Short interest in Voxeljet A.G. (NYSE: VJET) remained unchanged at 1.54 million shares, with days to cover rising from eight to 18. The share price rose about 2.4% in the period to June 15. The stock closed at $7.62 on Wednesday, down about 3.5% for the day, in a 52-week range of $7.13 to $27.41.

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