Memory chip stocks are trading higher in the pre-market session following a report that Samsung and SK Hynix are upgrading their China-based NAND flash production facilities. This move is aimed at increasing the output of more advanced chips to meet the surging demand from the artificial intelligence sector and to better compete with Chinese manufacturers. The upgrades are a significant development amid an ongoing memory supply shortage and underscore the robust demand for memory products, which has been a key driver of the sector's recent strong performance. Additionally, a technology webinar hosted by Micron today to outline its AI memory roadmap is likely contributing to the positive sentiment.