Bank of America's Michael Hartnett has sounded a cautionary alarm, suggesting the red-hot South Korean stock market is tactically 'overbought' and due for a correction.
This warning comes after a spectacular, near-vertical rally driven by the AI-memory super-cycle, which saw shares of chipmaker SK hynix skyrocket an incredible fivefold in just ten months. The speed and scale of this ascent have drawn comparisons to past tech bubbles, prompting analysts to question its sustainability.
Of course, the rally wasn't built on pure speculation. First, it was powered by stunning fundamental data. South Korea’s semiconductor exports more than doubled year-over-year in January 2026, with February's preliminary data showing even faster growth. This confirmed a powerful earnings story that investors couldn't ignore.
However, second, this created a new risk: extreme market concentration. Samsung Electronics and SK hynix grew to represent over a third of the entire KOSPI index. This means the fate of the entire market has become dangerously tied to the performance and news flow of just two companies in a single industry.
Hartnett's call isn't just about Korea, though. It's part of a broader global view that many markets became frothy simultaneously. With Japan's Nikkei hitting all-time highs and the Chinese yuan surging, he saw a pattern of crowded trades ripe for a reversal.
So, why did investors keep buying? Despite the massive price gains, valuations like the P/E ratio remained reasonable, thanks to analysts rapidly increasing their earnings forecasts for 2026. The real issue, Hartnett argues, is positioning. When almost everyone is bullish and fully invested, there are few buyers left to push prices higher, making the market vulnerable to a sharp drop on any bad news.
In essence, the warning of a 'tactical correction' is about stretched positioning and overheated technicals, not a broken long-term growth story. A 10-15% pullback could be a healthy reset. The real danger would emerge only if the fundamental drivers, like strong HBM demand and pricing, begin to unexpectedly weaken.
- Glossary
- Overbought: A technical analysis term for when a security's price has risen too quickly and is suspected to be due for a correction.
- HBM (High Bandwidth Memory): A type of high-performance RAM used in GPUs and network devices, crucial for AI applications.
- P/E Ratio (Price-to-Earnings Ratio): A valuation metric that compares a company's stock price to its earnings per share.