Short interest in two of the four 3D printing companies we follow rose sharply in the most recent two-week period. The share price gains combined with the trading volume suggest that a short squeeze came into play for these two stocks. The other two stocks posted gains in short interest as valuations remain very high and there is more chatter about consolidation in the sector. The following information is based on data reported for the period ended June 30, 2014.

Short interest in 3D Systems Corp. (NYSE: DDD) fell 4.8% to 32.34 million shares. Some 31% of the company’s stock is short. Days to cover has dropped to seven. In the two-week short interest period to June 30, the share price rose more than 21%, but it is down nearly 41% for the year to date as of Thursday night’s close. The stock’s 52-week range is $43.35 to $97.28, and shares closed at $55.95.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall 7.5% in the last two weeks of June to 6.46 million shares, or about 15.2% of the company’s float. Days to cover is now six. Shares gained about 19% in the two-week period and have gained nearly 14% since June 13. Shares closed down about 1.6% Thursday night at $103.30, a drop of about 23% for the year to date. The stock’s 52-week range is $79.83 to $138.10.

Short interest in The ExOne Co. (NASDAQ: XONE) rose 11.3% to 3.54 million shares. About 43% of the company’s shares are now held short. Shares of ExOne rose nearly 37% in the two-week period and closed at $35.83 Thursday night, down about 43% year to date. The stock’s 52-week range is $24.34 to $78.80 and days to cover is six.

Voxeljet A.G. (NYSE: VJET) saw short interest rise 4.9% to 1.82 million shares, with a days to cover number of two. Since the company came public at $19 in mid-October, the share price is down about 35%. Year to date, shares are down nearly 57%, but rose about 47% in the two-week period to June 30. The stock closed at $18.64 Thursday, in a post-IPO range of $12.85 to $70.00.

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