Stock Market Strategy: Guidance for Key Stocks — May 17, 2026

Market Snapshot

• KOSPI: 7,493.18 (−6.12%, −490.52pt) ※ Based on closing price, Friday, May 15
• KOSDAQ: Data unconfirmed — Naver Finance real-time snapshot failed to load
• Supply/Demand: Foreigners net sold 5.6 trillion won; institutional net selling (specific scale unconfirmed)
• Exchange Rate/Treasury Bonds: KRW/USD and 3-year Treasury yields — Real-time data unconfirmed
• Trading Value: Estimated record-high trading volume for KOSPI (specific figures unconfirmed)

Global Background — U.S. Market (Closing May 15)

• Dow, S&P 500, Nasdaq decline: Major U.S. indices finished lower due to tech weakness and spiking bond yields. The S&P 500 barely maintained its 7-week winning streak. Both the Nasdaq and S&P 500 fell on May 15.
• 10-Year Treasury Yields & WTI Crude Oil spike: Rising oil prices and bond yields stoked inflation fears, pressuring the market. Bond yields hit annual highs.
• Trump-Xi Beijing Summit concludes: The two-day U.S.-China summit ended without concrete agreements, turning initial optimism into disappointment and putting pressure on risk assets. The DXY (Dollar Index) remained strong.

Leading Sectors & Themes (At least 3 sectors)

Priority 1 — AI Semiconductors & Memory (Samsung Electronics, SK Hynix)

• Movement: Samsung Electronics fell 8.61%, and SK Hynix plummeted 7.66%. The top two KOSPI market cap stocks led the index drop, becoming the primary target for foreign sell-offs after the 8,000-point peak.
• Leading Stocks (Declining): Samsung Electronics (005930) −8.61%, SK Hynix (000660) −7.66%, and leveraged ETFs for both companies plummeted.
• Check Points: Following expectations of an AI supercycle since early May (which saw the stocks climb 129% and 191% respectively YTD), profit-taking materialized. A massive 5.6 trillion won sell-off by foreigners triggered automated trading circuit breakers.

Priority 2 — Securities Firms' Target Price Hikes (Semiconductor Supercycle Debate)

• Movement: Just before the crash, securities firms continuously raised target prices: Samsung Electronics (430k→500k KRW) and SK Hynix (2.75M→3.1M KRW). KB Securities raised SK Hynix from 2M to 2.8M KRW.
• Leading Stocks: Samsung Electronics (005930), SK Hynix (000660), Hanmi Semiconductor (042700), etc. (HBM/AI supply chain)
• Check Points: A clash between bulls claiming the "memory supercycle is not over" and bears warning of "fading momentum." While big tech investment is expected to continue next year, short-term valuation risks have materialized.

Priority 3 — Inflation & Interest Rate Risk Theme (Downward Pressure on All Sectors)

• Movement: The U.S. 10-year Treasury yield hit an annual high, creating a global "risk-off" environment. Rising oil prices added to inflation re-acceleration concerns.
• Leading Stocks: Defensive, dividend, and financial stocks relatively outperformed (specific percentage unconfirmed).
• Check Points: Fed rate-cut expectations are retreating, and inflation caution is reigniting. Keep an eye on domestic bond and FX market volatility.

Guidance for Key Stocks (At least 3 stocks)

This guide provides reference price ranges based on securities reports and disclosure data; investment decisions are the investor's own responsibility.

Samsung Electronics (005930)

• Closing Price / Change: −8.61% on May 15
• Supply/Demand: Massive foreign net selling; institutional selling likely.
• Fundamental Trigger: Profit-taking after a 129% YTD surge driven by AI/HBM demand. Despite target price hikes to 430k–500k KRW, valuation pressure has surfaced.
• Target Price / Support & Resistance: Recent target range 430k–500k KRW. The 52-week high was likely hit right after crossing 8,000pt; medium-term box-bottom needs confirmation.
• Risk Factors: ① Prolonged liquidity gap if foreign exits continue, ② Signals of a slowdown in U.S. AI investment cycles.
• Response Scenario: Favorable — If foreign net buying resumes and U.S. tech rebounds, watch for stabilization above 7,500pt KOSPI. Unfavorable — Beware of downward pressure if KOSPI breaks 7,000pt support.

SK Hynix (000660)

• Closing Price / Change: −7.66% on May 15
• Supply/Demand: Concentrated foreign net selling (a major component of the 5.6T KRW total KOSPI foreign sell-off).
• Fundamental Trigger: 191% YTD surge due to HBM3E dominance and AI server demand. KB Securities raised target to 2.8M KRW, some up to 3.1M KRW.
• Target Price / Support & Resistance: Target range 2.75M–3.1M KRW. Watch for the formation of a new bottom following the −7.66% drop.
• Risk Factors: ① Market doubt regarding AI supercycle continuity, ② Higher discount rates for growth stocks due to rising bond yields.
• Response Scenario: Favorable — Nvidia earnings beat could confirm HBM demand. Unfavorable — Watch if recent box-bottom holds amid further foreign exits and U.S. tech decline.

Samsung Electronics/SK Hynix Leveraged ETF & IMA Products

• Closing Price / Change: Plunged (specific percentage unconfirmed)
• Supply/Demand: Target of heavy foreign selling.
• Fundamental Trigger: Leveraged ETFs and IMA (Individual Comprehensive Asset Management Account) products were gaining attention, but are now under pressure from the underlying assets' plunge.
• Risk Factors: ① Doubled losses due to leverage structure, ② Risk of circuit breakers recurring.
• Response Scenario: Favorable — Fast recovery expected if semiconductor stocks rebound. Unfavorable — Reduce positions if foreign selling persists and leverage risks maximize.

Must-Watch Events

• Nvidia (NVDA) Earnings (After hours, May 17–18 KST): The barometer for AI semiconductor demand. Guidance on HBM demand will dictate the direction of Samsung/SK Hynix.
• U.S. Treasury Yield Trends (May 18–19, morning KST): Further rises in the 10-year yield will worsen global risk-off sentiment. Stabilization is a prerequisite for the return of foreign KOSPI investment.
• KOSPI Foreign Supply/Demand (May 18 Open): Whether foreign investors return after the 5.6T KRW sell-off. The first 30 minutes on Monday, May 18, will be a key indicator.
• Bank of Korea Base Rate Decision: Check the official calendar, as dates for Korea's rate decisions are key events.

One-Line Strategy Memo

The KOSPI's 6% plunge after hitting 8,000pt is largely a release of short-term overheating, but the shock of a 5.6 trillion won foreign sell-off remains. The biggest variables this week are Nvidia's earnings and the stabilization of U.S. bond yields. If both resolve favorably, expect a semiconductor-led rebound; otherwise, we cannot rule out a test of the 7,000pt KOSPI support level. We recommend defensive portfolio management for now and suggest monitoring the 7,500pt KOSPI level as a short-term benchmark.

This material is a market briefing summarizing news, disclosures, and securities reports. It does not constitute investment advice or guarantee profits. All trading decisions and results belong to the investor.