Hanwha Solutions and OCI Holdings shares rose 11.47% and 10.44%, respectively, on September 28 as U.S. solar prices climbed amid tighter import restrictions. Hanwha Solutions traded at 32,550 won at 11:03 a.m., while OCI Holdings changed hands at 227,500 won. President Donald Trump last month signed a proclamation imposing a 15% tariff on polysilicon derivatives under Section 232 of the Trade Expansion Act, targeting low-priced imports from China and other countries and supporting U.S. production. Prices are rising before the rules take effect: 55% of suppliers on Anza have incorporated Section 232 into quotations, and median imported-module prices for deliveries after December 4 reached $0.38 per watt, up about 41% from $0.27 before the policy announcement. Analysts say Korean companies with U.S. manufacturing capacity and reduced reliance on Chinese supply chains could gain pricing power. Earlier market data also showed higher U.S. bifacial Mono PERC module and domestically produced polysilicon prices, while trade investigations involving India, Indonesia and Laos added supply uncertainty.