Taiwan's circuit board makers jumped sharply, a win for investors riding the AI hardware boom.

• Nan Ya PCB and Asia Electronic Material hit their daily limit up, with Kinsus and Zhen Ding also climbing.
• The AI buildout has moved past chips themselves and is now driving huge demand for high-end IC substrates.
• ABF substrates are a must-have part in advanced chip packaging, and supply is far short of demand.
• Unimicron expects substrate prices to rise 10-15% each quarter through the rest of the year, with strong margins already showing up in its results.
• Hua Tong is another winner, supplying more than 90% of SpaceX's space-grade boards as Starlink expands on an $8 billion military order.

Outlook: The substrate shortage is not expected to ease before 2028, so prices and orders should keep pushing these stocks higher, though a fast run-up leaves room for sharp pullbacks.