KOSPI, KOSDAQ Market Cap Drops 212 Trillion Won in One Month

What 6,022 Trillion Won Really Says

Combined KOSPI and KOSDAQ market capitalization fell by 212.5550 trillion won over the month through Sept. 14, 2026. The first point investors should note is that this is more than a simple index correction. Samsung Electronics and SK hynix saw their market capitalizations drop 30% and 39%, respectively, from their peaks, showing that the core pillars of South Korea’s stock market have weakened as well.

According to Yonhap News’ 11:40 a.m. tally on Sept. 14, the two markets’ combined market capitalization was 6,022.2230 trillion won. Market capitalization is the combined value the market assigns to all listed shares. The contraction means valuations attached to South Korean stocks are lower than before, and the index’s resilience will be tested without a recovery in large semiconductor stocks.

The Gap From June’s Peak Is Deeper Than the One-Month Drop

KOSPI market capitalization was 5,567.1110 trillion won at 11:40 a.m. on Sept. 14, 2026, while KOSDAQ stood at 455.1120 trillion won. The combined total declined 3.41% from 6,234.7780 trillion won on Aug. 14. Compared with July 14, it was also down 34.9100 trillion won, or 0.58%.

Looking back to June 22, the gap widens further. Combined market capitalization had fallen 24.66% from that level, with the amount listed in the data as “1,971 trillion 173 billion won” (the source’s original notation was “1천9천71조1천730억원”). The 212.5550 trillion-won decline over one month shows recent pressure, but the comparison with June’s peak reveals how much market value has yet to be recovered.

From 6,000 Trillion to 8,000 Trillion Won—and the Retreat

Combined market capitalization first surpassed 6,000 trillion won on April 27, 2026, and broke through 7,000 trillion won on May 11. It also exceeded 8,000 trillion won intraday in June. However, the exact date when it crossed 8,000 trillion won cannot be confirmed from the provided data.

KOSPI likewise recorded an all-time intraday high of 9,385.59 points before falling 22.19% in July and reaching as low as 5,262.77 points that month. Even so, combined KOSPI and KOSDAQ market capitalization remains up 2,038.4570 trillion won, or 51.17%, since the start of 2026. The distinction is clear: the expansion from the year’s beginning remains, but a recovery to the peak has not been demonstrated.

Samsung Electronics and SK hynix Show Leadership Stocks Retreating

• Samsung Electronics had a market capitalization of 1,482.0310 trillion won on Sept. 14, 2026. Compared with 2,119.2750 trillion won on June 18, it was down 30%. Because this change since the peak is far larger than the entire South Korean market’s one-month decline of 3.41%, index weakness and leadership-stock weakness cannot be viewed separately.
• SK hynix had a market capitalization of 1,263.7510 trillion won on Sept. 14, 2026. It fell 39% from 2,080.3780 trillion won on June 22, a larger decline than Samsung Electronics. If semiconductor stocks retain their leadership, they can reinforce downside support in South Korea’s stock market; if that leadership breaks, the path to narrowing the gap with the peak also becomes more limited.

From Rates to Supply-Demand (Order Flow): This Week’s Conditions

Han Ji-young, a researcher at Kiwoom Securities, told Yonhap News that major U.S. economic data, the possibility of a rate hike at this month’s Federal Open Market Committee (FOMC) meeting, international oil prices and shifts in foreign investors’ supply-demand (order flow) are likely to drive volatility early this week. What the market has already priced in is the contraction in market capitalization from the peak. What remains uncertain is how these factors will next affect foreign investors’ supply-demand (order flow) and semiconductor leadership.

There are also countervailing conditions. Han interpreted the KOSPI’s recent early-weak, late-strong pattern centered on semiconductors as a sign that buying demand entered during the correction and helped put a floor under the index. Rather than concluding that further losses are inevitable from the market-capitalization decline alone, investors should watch whether buying inflows continue and whether semiconductors retain their central role in the market.

Four Numbers Investors Should Track

• Combined market capitalization: Check whether the 6,022.2230 trillion won recorded at 11:40 a.m. on Sept. 14 narrows the gap with 6,234.7780 trillion won on Aug. 14.
• Foreign investors’ supply-demand (order flow): Track whether foreign net buying resumes, as Han Ji-young noted, alongside semiconductor leadership.
• Samsung Electronics and SK hynix: The key test for index recovery is whether their market capitalizations, down 30% and 39% from their June peaks, respectively, turn toward recovery.
• Market strength: Heo Jae-hwan, a researcher at Eugene Investment & Securities, said the pace of inflows into market funds and the pace of upward earnings-estimate revisions have both slowed. If both trends recover, the foundation for a market-capitalization rebound will change.

The Next Inflection Point Separating Optimism From Risk

The optimistic scenario is one in which buying demand continues during corrections, foreign net buying resumes and semiconductor stocks retain their leadership. Under these conditions, whether Samsung Electronics and SK hynix reduce their declines from the peak will be a direct indicator validating a recovery in combined market capitalization.

Downside risks emerge if major U.S. economic data, the possibility of a rate hike at this month’s FOMC meeting, international oil prices and changes in foreign investors’ supply-demand (order flow) all move adversely at the same time. The next judgment should rest not on vague hopes of a return to the peak, but on an actual turn in combined market capitalization, foreign net buying and semiconductor leadership.

This article is automatically summarized and analyzed from the original news report. View original (Yonhap News Securities)