[2026-07-27] Korea Stock Market Morning Preview | KOSPI Rebound Hopes After 5.7% Plunge vs. Iran-Oil Risk

📌 One-Line Summary

After Friday's steep KOSPI plunge of -5.72%, the market is expected to open in a cautious, wait-and-see mode, with technical rebound hopes on oversold conditions squaring off against US-Iran geopolitical risk and surging oil prices. Rather than the index itself, watch for sector rotation into geopolitical beneficiaries such as refiners and defense names.

🌙 Overnight Markets

US markets closed mixed overnight. The Dow and S&P 500 posted marginal gains, while the Nasdaq slipped as profit-taking pressure on technology names persisted. Concerns over AI investment spending and rising rate pressure from the oil surge weighed negatively on high-valuation growth stocks.

Index	Close	Change
Dow Jones	51,947.25	+0.46%
S&P 500	7,411.98	+0.05%
Nasdaq	24,975.82	-0.64%

The lack of clear direction in US indices makes it difficult to provide strong upside momentum for the Korean market. With the Dow edging higher while the growth-heavy Nasdaq declined, today's session in Korea is likely to favor stock- and theme-driven rotation over large-cap growth names. In particular, the "AI investment burden" cited as a driver of Nasdaq weakness could reignite the valuation debate across the semiconductor and AI value chain — a key variable that may determine how aggressively bargain hunters step into Korea's large-cap chipmakers.

The relative resilience of the Dow also suggests that defensive buying interest in cyclical and traditional value stocks remains alive. This supports the case that, in Korea too, money may rotate away from growth names toward earnings- and dividend-based value plays and geopolitically favored sectors.

💱 FX & Commodities

The USD/KRW rate stands at 1,459.42 won, with won-weakness pressure persisting at an elevated level. Expanded net buying of US stocks by Korean retail investors (over 4 trillion won in net purchases this month) has been flagged as one contributor to the rising exchange rate, and the US Treasury has also noted the growing overseas equity investment by Korean individuals as a won-weakness factor.

Item	Level	Note
USD/KRW	1,459.42 won	Won weakness persists
WTI Crude Oil	Sharply higher	US-Iran geopolitical risk
Bitcoin (BTC)	$65,139.88	-

News flow highlights a surge in international oil prices driven by US-Iran geopolitical risk. Upward pressure on rates from higher oil could translate into a heavier valuation discount burden for equities, a negative for growth stocks. Market experts including Kiwoom Securities have pointed out that "upward rate pressure from surging oil can create a valuation discount burden in the stock market." That said, should foreign net buying return, a reversal toward a lower exchange rate (won strength) remains possible — and indeed, signs of a temporary FX stabilization and recovering sentiment were observed alongside the recent return of foreign investors.

With the exchange rate hovering near the high of around 1,459 won, foreign investors face a currency-loss burden that may constrain aggressive buying. Accordingly, whether the FX rate reverses direction during today's session will be a key gauge of foreign flows and, by extension, the strength of any index rebound.

📉 Recap: Previous Korean Session

In the previous trading session on Friday, July 24, the KOSPI plunged -5.72% to close at 6,690.62, surrendering the 7,000 mark in a single stroke, while the KOSDAQ fell -5.32% to close at 748.22. Expanding US-Iran geopolitical uncertainty, surging oil prices, and an overnight slide in US markets combined to sharply erode investor sentiment. Top-cap semiconductor names such as Samsung Electronics and SK Hynix could not escape the weakness, deepening the index declines.

Index	Prev. Close	Change
KOSPI	6,690.62	-5.72%
KOSDAQ	748.22	-5.32%

Having tumbled more than 5% in a single day and entered short-term oversold territory, today offers a setup where a technical rebound attempt may emerge. However, since the external risks that triggered the plunge have not been fundamentally resolved, it is prudent to weight volatility expansion over rebound sustainability when responding.

🔥 Today's Key Themes & Sectors

1. Semiconductors (Samsung Electronics, SK Hynix) — Watch

Friday's plunge has left these names in oversold territory. Strength in US semiconductor stocks and the premium on SK Hynix's American Depositary Receipts (ADR) could serve as bargain-hunting incentives, but overnight Nasdaq weakness keeps directional conviction limited. Whether the large caps rebound will be the pivotal variable for the index's path.

2. Refiners, Energy & Defense — Expected to Rise

These sectors are expected to benefit from US-Iran geopolitical uncertainty and the surge in international oil prices. Amid heightened geopolitical risk, defense stocks may also enjoy a spillover benefit, so watch for potential buying interest in related names.

3. Rate-Hike Beneficiaries (Banks & Insurers) — Watch

The Bank of Korea's first rate hike in three and a half years, together with oil-driven upward rate pressure, keeps expectations alive for improved net interest margins at financial stocks. That said, concerns over an economic slowdown remain a capping burden.

4. Growth Stocks & Secondary Batteries — Caution

This is a phase where the valuation discount burden widens amid rising rates. Volatility could increase in tandem with Nasdaq technology weakness, warranting caution in short-term trading. High-valuation growth names built on future earnings expectations are especially vulnerable to rising rates, so even if an oversold rebound materializes, a selective approach that screens for earnings support is advisable.

As such, today's market shows a clear contrast between "oil/rate-hike beneficiaries (refiners, defense, financials) vs. rate-hike victims (growth, secondary batteries)." With index direction murky, stock selection and rotation response that distinguishes beneficiary from victim sectors will be key to today's returns.

🎯 Scenario Outlook

📈 Bull Scenario

If oversold recognition from Friday's plunge draws bargain buying from foreign and institutional investors, and US-Iran tensions ease with oil stabilizing, the KOSPI may attempt to recover the 6,800 level on rebound buying. The picture would feature large-cap semiconductor names leading the index, with SK Hynix's ADR premium and strength in US chip stocks potentially serving as a catalyst for sentiment recovery. Since technical rebounds the day after a 5%+ plunge are statistically frequent, a strong rebound open could keep the possibility of a buy-side sidecar on the table.

➡️ Neutral Scenario

Reflecting the mixed US market, the index is likely to stage a limited rebound that partially reverses Friday's decline before settling into a wait-and-see pattern. Rather than the index, sector rotation centered on geopolitical beneficiaries such as refiners and defense is expected.

📉 Bear Scenario

If oil surges and geopolitical risk expand again while rate-hike pressure intensifies, foreign selling and an FX spike could combine to send the KOSPI to test support at the 6,500 level in a further correction. Should panic-style selling like Friday's re-emerge, program selling and margin-call liquidation could amplify the decline, warranting close attention to whether the support line holds.

In sum, with upside and downside catalysts finely balanced, it is more sensible to apply a level-based response strategy than to firmly call the index direction. The reasonable approach is to expect rebound profit-taking pressure as the index approaches 6,900, and bargain buying inflows as it nears 6,500.

⚡ Key Checkpoints for Today

• Whether a technical rebound emerges after the -5.72% plunge — confirm bargain-buying inflows into large caps (Samsung Electronics, SK Hynix)
• US-Iran geopolitical risk and the direction of international oil prices — sustained oil surge would widen the rate-rise and equity valuation discount burden
• The USD/KRW level around 1,459 won — the direction of foreign flows and any outflow of Korean retail funds abroad
• The monetary policy stance after the Bank of Korea's rate hike, and the impact of rising rates on growth-stock valuations

Reference key support/resistance: KOSPI support 6,500 / resistance 6,900; KOSDAQ support 720 / resistance 775.

📅 Today's Economic Events

Global

No major high-impact global economic indicators are confirmed on the schedule for today (Monday, July 27). That said, the US-Iran geopolitical situation and the trajectory of international oil prices could act as variables beyond any indicator, so it is worth monitoring the related news flow closely.

Domestic

No scheduled major DART disclosures have been confirmed. Below are recent key domestic news items that market participants may want to watch:

• [Finance] Bank of Korea Governor Shin Hyun-song — prices, FX, and financial markets amid rate hikes (Jul 23)
• [TheBell] "We won't repeat the Fed's failure"… Bank of Korea's first rate hike in three and a half years (Jul 16)

⚠️ Investment Disclaimer

Disclaimer: This post is for informational purposes only and does not constitute investment advice. With the KOSPI having plunged -5.72% in a single session, volatility is extremely elevated, and technical rebound potential coexists with further downside risk. Intraday volatility could widen sharply depending on US-Iran geopolitical risk and the direction of oil, so refrain from reckless chasing and leverage, and exercise caution with staged entries and risk management. All investment decisions are the sole responsibility of the investor. Past performance does not guarantee future results.

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