Shares of silicon wafer supplier Formosa Sumco Technology Corp (台勝科) outperformed the broader market last week, reflecting investors’ expectation that its gross margin is likely to expand in the coming quarters as prices continue to climb, analysts said. Formosa Sumco, which was founded by Japan-based Komatsu Ltd and Taiwan’s Formosa Plastics Group (FPG, 台塑集團) in 1995, focuses on producing 8-inch and 12-inch wafers. The company has a monthly capacity of about 330,000 8-inch wafers and 300,000 12-inch wafers at the FPG complex in Yunlin County’s Mailiao Township (麥寮). Shares of Formosa Sumco on Friday closed 5.39 percent higher at NT$244.5 in Taipei