Three companies that make nearly all the world's memory chips—Samsung, SK Hynix and Micron—face a US class action lawsuit accusing them of restricting DRAM supply to inflate prices. Filed in California, the complaint alleges the trio cut DDR3 and DDR4 output, pivoted to pricey AI-focused HBM, and gouged consumers.

It marks the third such price-fixing cycle among the same firms.