Taiwan's cybersecurity software stocks are surging, a clear win for investors who got in early on the AI security theme.

• Hwacom locked at its daily price limit with heavy buying still queued up behind it.
• The rally started after Nvidia's Jensen Huang pointed to cybersecurity as a big AI-driven business opportunity.
• Four other Taiwanese security names, including Waffer Technology's peers Huahong and Pushing, also jumped.
• Hwacom's sales are still down from last year, but first-half profit rose and it is betting on security, AI, and cloud demand.
• Foreign investors bought the stock for a fourth straight day.

Outlook: The AI security theme looks set to keep lifting Taiwan's software stocks while Nvidia keeps talking it up, though Hwacom's weak sales make the rally vulnerable if buying interest fades.