MEMC Electronic Materials
MEMC Electronic Materials (NYSE: WFR) designs silicon wafers.
MEMC claims to be the second largest producer of polysilicon in the US after Hemlock, a jv of Dow Chemical and Corning Glass Works via Dow-Corning. MEMC is a licensee of the Westinghouse Siemens process. The company originated as a division of Monsanto.
However, MEMC is not usually listed as a major supplier of polysilicon. Hence, they appear to specialize in the final processing of silicon wafers rather than conversion of metallurgical grade silicon to polysilicon.
A bit more about MEMCs processing technology was revealed in the obituary of Bob Walsh, the "Father of Polishing." [] His process for smoothing the rough surface of wafer slices used a combination of chemical etching and mechanical polishing.
Memc 50 yr Anniversary Book