Taiwanese optical lens maker Largan Precision is having a great day, and it's good news for investors betting on the AI data center boom.

• Largan shares hit an all-time high, jumping nearly 10% to the daily limit after announcing 3M will invest about $150 million for a 4.68% stake.
• The deal pairs 3M's optical connector technology with Largan's manufacturing scale to build parts for AI servers, specifically the optical links that move data between chips.
• 3M's technology is already used by Microsoft and is expected to expand into Amazon's cloud business, and analysts expect that market to grow fast over the next two years.
• Wall Street brokers raised their price targets on Largan, forecasting strong earnings growth through 2028 as the AI data center buildout continues.
• Separately, Taiwan's stock market rose sharply, led by chipmakers, while Cathie Wood's ARK Invest sold off its AMD and TSMC holdings.

Outlook: Largan looks set to keep benefiting as AI data center spending drives demand for its optical components, though broader Taiwan stocks remain volatile amid mixed foreign investor flows.