Latest media reports state that SK Hynix has completed the final verification phase for customer samples of its 12-layer sixth-generation high-bandwidth memory (HBM4) prior to mass production. The Korea Herald reported that SK Hynix has effectively entered the mass production process for its 12-layer HBM4 products and is supplying customers with more than 20,000–30,000 paid HBM4 samples. After establishing a global 12-layer HBM4 mass production system in September 2025, SK Hynix finalized a 2026 HBM4 supply contract with Nvidia and has begun production, according to Deal Site and other South Korean media. Meanwhile, Samsung Electronics is approximately three to four months behind schedule.