The Great Kanto Earthquake in September 1923 resulted in a sudden spike in demand for sheet glass and some manufacturers went ahead with raising the price of their glass products. Anticipating more price increases, the Futajima Plant briefly considered delaying deliveries. However, in response to Kankichi Yukawa, director of Sumitomo Corporation, who urged “not taking advantage of the disaster and staying true to the Sumitomo spirit,” the company continued to supply products with little changes in price. The inventory was totally cleared out, and in 1924, the company’s shares were traded on the Tokyo Stock Exchange for the first time.