South Korea probes Montage Technology’s office in antitrust investigation targeting memory chip price-fixing

Seoul prosecutors swept into the Korean offices of Chinese chipmaker Montage Technology on July 15 as part of a broad antitrust investigation into alleged price-fixing in the memory interface chip market. The raid wasn’t a solo affair. Authorities also searched local offices of Japan’s Renesas Electronics and US-based Rambus on the same day.

The Seoul Central District Prosecutors’ Office’s Fair Trade Investigation Division is examining whether the three companies colluded on pricing strategies that may have benefited major memory producers including Samsung Electronics, SK Hynix, and Micron.

The fallout was immediate

Montage Technology’s share price cratered by roughly 20-23% on the Hong Kong Stock Exchange following news of the raids.

Montage holds what’s reported to be the largest share of the memory interface chip market. Memory interface chips are the connective tissue that allows memory modules to communicate with the rest of a computer system.

The company has said it will cooperate with the investigation while maintaining that it complies with existing regulations.

This isn’t Montage’s first brush with antitrust scrutiny. The US Department of Justice’s Antitrust Division reportedly opened its own probe into Montage over similar price-fixing concerns back in January 2026.

Why memory interface chips matter more than you think

If Montage, Renesas, and Rambus were indeed coordinating on pricing, the ripple effects would extend well beyond their own balance sheets. Samsung Electronics, SK Hynix, and Micron, three companies that collectively dominate global memory production, are among the primary buyers of these interface chips.

The investigation is focused on possible information exchange and methods of alleged price coordination. Prosecutors seized evidence during the raids.

What this means for investors

The DRAM price-fixing scandal of the mid-2000s resulted in billions in fines and multiple criminal convictions.

Investors should watch for whether the DOJ’s parallel investigation produces charges or settlements, since coordination between US and South Korean authorities would signal a genuinely global enforcement effort. They should also monitor whether Samsung, SK Hynix, or Micron face any downstream liability or are called as witnesses.

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