Mostly True
Foreign investors sold a net of roughly 3 trillion won in South Korean semiconductor stocks as a market narrative known here as the "AI speed control" theory โ the view that global AI investment is downshifting from its breakneck pace โ triggered broad profit-taking in the sector, a review of eight primary sources by this newspaper has found. The selling pressure landed on the industry's two bellwethers, Samsung Electronics and SK hynix, whose run-up this year had been fueled by expectations around AI accelerators, GPU-linked memory demand and advanced foundry capacity. The headline figure was broadly corroborated by available market data, though independent confirmation was constrained after the Korea Exchange's KRX Information Data System (data.krx.co.kr) API returned a session block (LOGOUT) when queried during verification.
The phrase refers to a fast-spreading argument among investors that spending on AI infrastructure โ data centers, LLM training clusters and the GPUs that power them โ is entering a phase of measured adjustment rather than unchecked expansion. For a Korean market whose rally has leaned heavily on semiconductor names, any suggestion that AI demand is decelerating carries outsized weight. That sensitivity showed in trading, with foreign investors, traditionally a barometer of global sentiment toward Korean chips, moving to the sell side in size.
Samsung Electronics and SK hynix sit at the center of this dynamic. The former spans memory, foundry and system chips, while the latter supplies the high-bandwidth memory that feeds AI accelerators. Both have served as proxies for the AI trade on the KOSPI, making them natural targets when conviction in that trade wavers.
The 3 trillion won outflow figure, the core of the claim, was tested against eight primary sources. Reviewers found the magnitude consistent with the scale of foreign net selling reported for the period in question. A complication arose, however: direct retrieval of trading data from the KRX Information Data System โ the exchange's official statistics portal โ was not possible, as the API rejected requests with a session block (LOGOUT). That prevented an independent, figure-by-figure recomputation of daily and stock-level flows, meaning the exact composition of the selling between Samsung Electronics, SK hynix and smaller names could not be pinned down from first-party exchange data alone.
Even so, the direction and rough size of the outflow aligned across the remaining sources reviewed, and no evidence emerged contradicting the central assertion that foreign investors exited semiconductor positions on a scale in the trillions of won as the AI adjustment narrative took hold. What remains less certain is the precise split by stock and session โ a gap attributable to the blocked exchange data access rather than to any discrepancy in the underlying claim. On the available evidence, the claim that the "AI speed control" debate spooked foreigners into dumping about 3 trillion won of Korean semiconductor shares is Mostly True.