SK Hynix's board-approved 54.3 trillion won investment plan is now feeding directly into South Korean equity markets, after the chipmaker's decision to spend 35.2 trillion won on the Yongin Y2 fab and 19.1 trillion won on the Cheongju M17 fab triggered a broad rally in semiconductor equipment stocks on Aug. 10. Jusung Engineering rose 13.30%, Wonik IPS gained 11.44%, EO Technics climbed 10.02%, PSK surged 12.08%, Leeno Industrial added 7.61% and Simmtech also advanced, as investors treated the board resolution as a credible sign that a previously outlined expansion strategy is moving toward execution. The investment follows SK Hynix's June strategy under which it aims to complete four fabs at the Yongin Semiconductor Cluster by 2033, 12 years ahead of the original 2045 schedule, while also expanding its Cheongju NAND base. Seoul Economic Daily said the market drew confidence from the fact that the latest decision included specific capital amounts and timelines, distinguishing it from broader industry blueprint announcements this year. The rally was reinforced by strong Kosdaq inflows and a wider risk-on move. Foreign investors and institutions were net buyers of 105.4 billion won and 566.1 billion won, respectively, helping lift the Kosdaq 6.97% to 854.47. A buy-side circuit breaker was triggered at 9:50 a.m. after the Kosdaq 150 futures index rose more than 6% from the previous close while the spot index gained more than 3% for one minute. The advance extended beyond chip equipment names, with Alteogen jumping 14.26% on BlackRock's increased stake and strong earnings. The market response adds a fresh near-term dimension to an existing story centered on AI memory demand, capacity expansion and equipment orders. Analysts and industry observers have said SK Hynix's accelerated fab timeline is a preemptive move to secure future output in HBM, next-generation DRAM and NAND, though meaningful new supply from the latest buildout is still expected to take years to arrive.