Nvidia's chief executive is back in Taiwan on an unannounced trip, a routine but closely watched signal for the island's chip supply chain.

• Jensen Huang was spotted walking around Taipei with his wife, Lori Huang, posing for photos with locals.
• Onlookers filmed him buying steamed buns in the Da'an district, which set off chatter online.
• The trip appears to be private — his plane's arrival and his schedule were kept quiet.
• It is his third visit this year, after a January company banquet and a Computex swing in late spring that gathered TSMC, Quanta and Foxconn executives.

Outlook: With no public agenda announced, expect speculation about supplier meetings until Nvidia says otherwise.