Shares of Taiwanese cooling specialist Auras (2421) surged to their daily limit, a win for investors betting on the AI server buildout.

• Cooling stocks were the hot trade, with Auras jumping straight to limit up on heavy volume.
• Profit is climbing fast — first-half earnings rose nearly 60% from a year earlier on stronger AI server and networking demand.
• The company is pushing beyond fans into liquid cooling plates, aiming at the same GPU and custom-chip boom.
• Foreign investors bought big for a fourth day running, and other institutions joined in.
• Day trading made up a large share of recent turnover, so the price could swing hard both ways.

Outlook: Demand for AI server cooling looks strong into the second half, but the heavy short-term trading makes a sharp pullback just as likely as another leg up.