Young Poong shares hit the daily price limit on September 14 after its subsidiary, Young Poong Electronics, began supplying high-layer multilayer printed circuit boards to North American big tech companies. The stock was up 29.91% at ₩49,950, or about $37, at 9:57 a.m., after rising 27.20% the previous trading day. Static volatility interruptions were triggered before the open and again at the start of regular trading. The products reportedly include semiconductor test boards and network switch boards, marking an expansion from Young Poong Electronics’ established flexible printed circuit board business for mobile devices. The company has prepared the high-layer MLB business for about three years, with related products forecast to generate more than 10% of its revenue this year. Its development plans also target products with at least 60 layers and a maximum thickness of 8.0T (mm) for AI servers, high-speed networks and data centers in 2026 and 2027.