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Fourteen individual consumers and three small businesses filed a federal class action in the Northern District of California on June 25 against Samsung Electronics, SK Hynix, and Micron Technology, alleging the three companies colluded to restrict DRAM supply and inflate prices by coordinating the shift to high-bandwidth memory. The case, Garciaguirre et al. v. Samsung Electronics et al., was filed by antitrust firm Bathaee Dunne, which previously won a case alleging collusion in Google’s digital advertising market.

The Allegation

The plaintiffs argue that Samsung, SK Hynix, and Micron, which collectively control roughly 90% of global DRAM production, systematically coordinated the transition away from DDR3 and DDR4 in favor of HBM to manufacture a shortage. AI data center demand created the cover story. The complaint claims prices have risen approximately 700% over the past four years, with Apple’s recent broad product price increases serving as the proximate trigger for the lawsuit.

The three companies are not just competitors with parallel interests. The complaint frames them as a functioning oligopoly with a prior record of coordination, pointing to 2005 indictments of Samsung and SK Hynix executives in San Francisco for DRAM price-fixing and bid-rigging that resulted in large fines and prison sentences. The argument is that the three firms have done this before and know how.

The Precedent Problem

The 2005 conviction is the lawsuit’s sharpest edge. In that case, Samsung and Hynix America executives were found to have agreed, during private meetings and phone calls, to issue price quotations at coordinated levels to OEM customers. The parallel to the current complaint is direct: same industry structure, same type of coordination allegation, same defendant companies.

Whether 2005 precedent helps the plaintiffs in 2026 depends on whether they can demonstrate actual coordination rather than parallel pricing behavior driven by shared market conditions. The defendants will argue that all three companies independently rational chose to pivot to HBM given AI demand, and that higher DRAM prices are a market outcome, not a conspiracy. That is a difficult but not insurmountable defense given the oligopoly concentration.

Scale and Stakes

The current class action is small: 17 named plaintiffs. If the court certifies a class covering all consumers and businesses that purchased products containing DRAM, the exposure expands significantly. Antitrust class actions in price-fixing cases carry mandatory treble damages on proven harm, which in a market where prices rose 700% across four years of consumer and enterprise purchases could reach into the hundreds of billions.

Jefferies and other sell-side analysts have said the suit is unlikely to affect memory prices through year-end. That framing treats the legal risk as a financial line item. The more significant question is whether the filing prompts regulators, either the DOJ or the FTC, to open their own investigation. Private class actions in US antitrust history have frequently run ahead of or alongside government investigations, and the two reinforce each other in discovery.

AI Demand as Legal Cover

The lawsuit’s underlying claim is that the memory companies exploited a genuine demand signal, AI data center buildout, to justify supply decisions that went beyond what efficiency economics required. The distinction between responding rationally to demand and coordinating to profit from it is the core legal question.

Micron’s stock has risen 1,309% over five years. SK Hynix’s has risen 2,045%. Those returns reflect both genuine demand and supply discipline. Whether that supply discipline crossed the line into illegal coordination is what a California federal court will now need to work through.