Disco is trading at €276.00, down 5.48% on October 27, after its October–December operating income forecast came in about ¥10 billion below market expectations. - The forecast followed the company’s October 22 results, which came despite a strong quarter. - Disco cited rapid fluctuations in customer investment appetite as making semiconductor-industry demand difficult to predict. - Shares have remained weak after recent declines, despite a rebound in the semiconductor sector.