Shares of veterinary diagnostics manufacturer IDEXX Laboratories, Inc. (IDXX, Financial) contributed to the third quarter performance. The company reported strong second quarter results that demonstrated share gains in instruments and reference labs, and assuaged concerns regarding its competitive position in rapid assays. Catalyst placements grew 44% in the quarter, driven by the launch of CatalystOne in the U.S. and Europe. Premium hematology placements grew 30% in the third quarter, a meaningful increase from 14% in the second quarter. Reference lab results were also strong, growing 12.1% in the third quarter. (Neal Rosenberg)
From Baron Funds' Baron Partners Fund shareholder letter for Q3 2015.