We continue to track the short interest changes in the primary 3D printer and services companies. The following information is based on data reported for the period ended February 14, 2014.

Short interest in 3D Systems Corp. (NYSE: DDD) soared 43.4% to 23.84 million shares. Some 24.6% of the company’s stock is short. In the two-week short interest period to February 14, the share price fell more than 7%, and it is down about 19% for the year to date as of Wednesday night. The stock’s 52-week range is $27.88 to $97.28, and shares closed at $75.97 Wednesday.

Short interest in Proto Labs Inc. (NYSE: PRLB) decreased by 7.4% to 3.06 million shares, or 13.8% of the company’s float. Shares were up about 0.4% in the two-week period and closed Wednesday at $78.79, up about 12% year-to-date. The stock’s 52-week range is $43.50 to $89.97.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest drop 4.9% in the first two weeks of February to 2.01 million shares, or about 4.8% of the company’s float. Shares gained about 1.6% in the two-week period and closed at $126.60 Wednesday, down nearly 5.5% for the year to date. The stock’s 52-week range is $61.15 to $138.10.

Short interest in The ExOne Co. (NASDAQ: XONE) rose 16.8% to 3.23 million shares. About 31% of the company’s shares are now held short. Shares of ExOne were down about 6.6% in the two-week period and closed Wednesday at $45.33, down about 27% year-to-date. The stock’s 52-week range is $26.07 to $78.80.

Voxeljet A.G. (NYSE: VJET) saw short interest rise by 5.4% to 2.66 million. Since the stock came public at $19 in mid-October, the share price is up nearly 20%. Year-to-date, however, shares are down 20% and are down more than 5% in the past two weeks. The stock closed at $34.50 on Wednesday in a post-IPO range of $19.30 to $70.00.

3D Systems continues to attract the most interest from short sellers. A short-seller report trashing the company hit in the final week of January and the stock price has continued to slide. These are momentum stocks and as such very volatile, a short seller’s wheelhouse. 3D Systems and ExOne get most of the shorts’ attention.

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