SK Hynix controls more than half of the high-bandwidth memory market, a critical component for Nvidia AI accelerators. The company's Nasdaq listing gives U.S. investors access to a business with strong technology leadership and close ties to Nvidia. SK Hynix makes more than half of the world's high-bandwidth memory, which Nvidia needs for its AI accelerators. The debut was the largest first-time U.S. listing ever by a foreign company, after investor demand exceeded shares available by more than seven times. SK Hynix holds roughly 56% of the HBM market. The newest generation, HBM4, is tied to Nvidia's latest Vera Rubin platform, and supply chain estimates suggest SK Hynix will provide the majority of the HBM4 going into those systems. In June, the two companies announced a technology partnership to align their roadmaps. Investors should remember that memory is a cyclical industry, and future returns will depend on SK Hynix's ability to defend its technological lead against Samsung and Micron while navigating shifts in AI demand.