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Short interest during the two-week period ending February 28 fell on all four 3D printing stocks we follow. Year-to-date share price gains that were impressive just two weeks ago have now dropped sharply. Short sellers have reduced their positions, choosing to wait until other investors have made their move before jumping back in.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 8.1% to 20.87 million shares. Some 19.3% of the company’s float was short. Days to cover fell from 13 to seven. In the two-week short interest period, the share price fell by about 13.1%. The stock’s 52-week range is $11.01 to $19.76, and shares closed at $14.46 on Thursday, down about 0.6% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest drop by 8.1% in the final two weeks of February to about 4.24 million shares, or 8.2% of the company’s float. Days to cover fell from seven to six. The share price fell by 10% in the period. The stock closed at $18.17 on Thursday, down about 9.4% on the day, after the company reported quarterly results on Thursday and offered a weak outlook. The 52-week range is $16.37 to $30.46.

Short interest in The ExOne Co. (NASDAQ: XONE) fell by 1.6% to 2.29 million shares. About 23.4% of the company’s shares were short. ExOne’s share price dropped about 2.8% in the short interest period. The stock’s 52-week range is $9.03 to $16.15, and shares closed at $9.68 on Thursday, down 3.6% for the day. Days to cover fell from 22 to 16.

And Voxeljet A.G.’s (NYSE: VJET) short interest decreased by 0.6% to 518,262 American depositary shares, with days to cover rising from 14 to 15. The share price fell 6.6% in the two weeks to February 28. Voxeljet closed at $2.91 in New York on Thursday, unchanged for the day, in a 52-week range of $2.82 to $6.50.