Memory chipmakers face US class-action over DRAM shift

According to The Korea Herald and Economic Times, a proposed class-action complaint was filed in the US District Court for the Northern District of California by 17 plaintiffs described as individual consumers and small businesses. The filing alleges that Samsung Electronics, SK hynix and Micron Technology, which The Korea Herald reports together account for about 90% of the global DRAM market, coordinated production cuts in commodity DRAM (cited examples include DDR3 and DDR4) and shifted capacity toward HBM, the memory type used in AI accelerators. Investor's Business Daily and ChoSun report the complaint asserts DRAM prices rose approximately 700% over a four-year period and that the alleged conduct began in 2022. Investor's Business Daily quotes a Micron statement: "Micron disagrees with the allegations contained in the complaint. We compete vigorously, fairly and in compliance with all applicable laws wherever we do business. We will defend ourselves against these claims." The Korea Herald records that the complaint itself acknowledges overall DRAM wafer capacity is expanding even as a larger share is allocated to HBM.

Reporting in The Korea Herald frames the production shift as a commercial response to surging AI demand, noting that memory producers argue reallocating capacity to HBM has become unavoidable because HBM yields higher returns and consumes more wafer capacity per unit. Market research cited by AppleInsider and Tom's Hardware shows the three firms hold dominant revenue shares, which plaintiffs use to argue oligopoly power. Jefferies, as reported by The Korea Herald, projects DRAM prices may continue to rise through 2027 driven by AI demand outpacing supply growth; that projection is a market forecast, not a legal fact.

Legal context and precedent: ChoSun and other outlets recount earlier antitrust investigations in the DRAM sector, including DOJ probes from 1999 to 2002 that resulted in fines (ChoSun cites fines of 300 million dollars for Samsung and 185 million dollars for Hynix during that era). Multiple outlets, including The Korea Herald and Economic Times, caution the current lawsuit faces a high evidentiary bar because similar capacity shifts and HBM ramp-ups have been publicly documented. The central legal question reported by AppleInsider and Tom's Hardware is whether parallel business decisions reflect independent competitive responses to market incentives or an unlawful agreement among rivals.

For practitioners: What to watch

• •Court filings and discovery for evidence of inter-firm communications or coordination, which would materially change the legal risk profile reported by multiple outlets.
• •Statements and capital expenditure plans from major foundries and memory makers indicating HBM capacity expansion, as capacity trajectories alter supply calculations (reported market commentary in The Korea Herald).
• •DRAM spot-price indices and contract-price movements; plaintiffs cite large historical price moves (Investor's Business Daily, ChoSun).
• •Regulatory interest from DOJ/FTC or similar agencies; past investigations in the sector make such involvement a meaningful trigger.

Observed patterns in similar cases: Antitrust complaints that rest on parallel shifts in product mix typically require document-level evidence of agreement to overcome plausible independent-business-decision defenses. This has been a recurring pattern in hardware markets where high-margin product opportunities emerge.

Reported facts in this summary are drawn from The Korea Herald, Economic Times (ANI), Investor's Business Daily, ChoSun, AppleInsider, Tom's Hardware and related contemporaneous coverage.