Forex rates push Win Semiconductors to revise Q4 gross margin By Lisa Wang / Staff reporter Win Semiconductors Corp (穩懋半導體), the world’s largest pure-play gallium arsenide foundry, yesterday revised downward its gross margin forecast for last quarter due to the substantial appreciation of the New Taiwan dollar against the US dollar. Win Semiconductors was the first among local electronics companies to downwardly adjust its gross margin, blaming volatility of foreign exchange rates. In the final quarter of last year, the NT dollar appreciated about 2.12 percent to NT$28.508 versus the US greenback. A wafer sits under a microscope in an undated photograph.