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[US Close] 2026.08.18 S&P 500 falls -0.7% — Market Wrap

S&P 500 closed at 7,691.76, -0.69% on the day and -0.5% over the week — daily change bars for the last 5 sessions

Written by

Prunus mume

in

US Market Report · as of 2026-08-18 NY close

🌐 한국어판 보기

The S&P 500 closed at 7,691.76, down 0.69% on the day. Overall regime call: INFLATION.

S&P 500 Close
7,691.76
-0.69% · -1.4% vs peak
VIX
15.8
Calm <20
USD/KRW
1,412.3
-0.22% · 1M -5.1%
Regime
INFLATION
🟢 Entries allowed

📝 US Market Wrap

■ Market Overview & Leaders

US stocks slid for a third straight session as chip weakness dragged the tape. The Nasdaq led losses at -1.33% to 26,289.71, the S&P 500 fell -0.69% to 7,691.76, while the Dow held up relatively better at -0.22% (53,343.40). The real story was semis: the PHLX Semiconductor Index cratered -4.98% to 11,992.46, with Intel (-6.6%), AMD (-4.3%) and Applied Materials (-3.9%) among the worst hit — a sell-off likely to weigh on Asian chip peers overnight. Caterpillar (-4.6%) and Meta (-4.4%) also lagged. Defensive/software names bucked the trend, with Intuit (+4.4%), Eli Lilly (+3.6%) and Adobe (+3.6%) among gainers. The VIX jumped +4.28% to 15.84, reflecting rising unease.

■ Flows & Breadth

Notably, breadth stayed positive — 25 advancers versus 15 decliners among large caps — even as headline indices closed lower, underscoring how concentrated the damage was in semiconductors and mega-cap tech. This divergence suggests the pullback was sector-specific rather than broad-based risk-off.

■ Takeaway

Chip-driven volatility, elevated bond yields and geopolitical jitters are the dominant themes; breadth resilience offers some reassurance despite the tech-led drawdown. 📉

📊 Market Snapshot

Index Close 1D 5D 1M vs Peak
S&P 500 7,691.76 -0.69% -0.5% +3.3% -1.4%
Nasdaq 26,289.71 -1.33% -0.6% +3.1% -3.0%
Dow 53,343 -0.22% -0.8% +2.9% -1.9%
PHLX Semiconductor 11,992.5 -4.98% -0.9% +2.1% -18.1%
VIX 15.8 +4.28% +3.7% -15.1% -28.7%
USD/KRW 1,412.3 -0.22% -0.4% -5.1% -9.1%
💡 Korea Market 101
Alongside the majors, we track the PHLX Semiconductor Index (SOX) — the overnight driver of Korean chipmakers like Samsung Electronics and SK Hynix. A big SOX move often sets the tone for the next KOSPI session. VIX under 20 is calm; above 30 signals fear.

3-month index chart

🏷️ Large-Cap Movers (Today)

Gainers Chg Losers Chg
Intuit +4.4% Intel -6.6%
Eli Lilly +3.6% Caterpillar -4.6%
Adobe +3.6% Meta -4.4%
AbbVie +3.4% AMD -4.3%
Johnson & Johnson +3.3% Applied Materials -3.9%

Large-cap breadth: 25 up · 15 down (of 40)

The index fell, but more stocks rose than fell — losses were concentrated in a few heavyweights.

💡 Korea Market 101
Today’s biggest US large-cap moves. US sector rotation frequently leads the Korean market by a day — watching where money flows here gives a preview of tomorrow’s Seoul session.

🔄 Sector Rotation

Sector 1M 3M Score Type
Technology +11.0% +11.3% 28.2 Growth
Consumer Discretionary +8.4% +12.0% 12.7 Growth
Industrials +0.6% +16.7% 9.5 —
Health Care +4.9% +19.1% 9.0 Defensive
Financials +2.5% +11.0% 9.0 Defensive
Materials +1.3% +3.7% 8.8 —
Energy +11.1% +1.2% 8.5 Defensive
Communication Services +2.6% -4.8% 1.5 Growth
💡 Korea Market 101
A ranking of where money is flowing across industries. A higher score means stronger recent price action. ‘Growth’ sectors (chips, IT) lead in good times; ‘Defensive’ sectors (telecom, staples) hold up in downturns. When defensives cluster at the top, the market has turned cautious.

📐 Market Breadth

(40 names)

Above 200-DMA Above 50-DMA Up over 1M 52-wk highs 52-wk lows
68% 68% 70% 0% 0%
💡 Korea Market 101
What the index alone hides. ‘% above 200-DMA’ is the share of stocks in a long-term uptrend — below 50% means most stocks are in long-term decline even if the index isn’t. Comparing new 52-week highs vs lows reveals whether it’s truly a bull or bear tape underneath the headline number.

📰 Headlines

Headlines are credited to their publishers — click a headline to open the original article.

💡 Korea Market 101
English-language coverage of the Korean market. Two Korea-specific terms worth knowing: a ‘circuit breaker’ halts all trading when the index moves too fast, and a ‘sidecar’ briefly suspends program trading — both are exchange safety mechanisms you’ll see mentioned on volatile days.

🌐 Macro Dashboard

Indicator Level 1M Signal
US 10Y yield 0.85 — ▼
Dollar Index (DXY) 118.90 -1.5% —
Gold 4,394 +9.6% —
WTI Crude 84.80 -1.5% —
Bitcoin 64,528 +1.0% —
💡 Korea Market 101
The bigger picture around equities. A rising US 10-year yield raises borrowing costs and pressures stocks. A stronger dollar (higher DXY) tends to pull foreign capital out of emerging markets like Korea. Gold is the fear gauge, oil proxies inflation, and Bitcoin reflects risk appetite.

🌡️ Regime & Risk Diagnosis

  • Regime call: INFLATION — Inflationary — growth with rising price pressure
  • Allocation guide: Tilt toward real assets and value
💡 Korea Market 101
Think of the ‘regime’ as market weather. RISK-OFF means investors are sheltering in cash rather than risk assets. ‘Realized volatility’ is a thermometer for how wildly prices swing — under 20 is calm, above 40 is panic territory. The ‘crash gate’ is our system’s traffic light: when the Korean market falls too fast, it turns red and the system stops buying on its own, then reopens automatically when conditions settle. (Note: the regime diagnosis text is produced in Korean by the engine.)

🎯 System Watchlist

Sectors in focus: Health Care 5 names · Consumer Discretionary 5 names · Financials 4 names · Technology 3 names · Communication Services 2 names

Name Mkt Sector Style Score Target Stop Status
HSIC US Health Care Swing 100 +11.2% -5.6% Watching
ZBRA US Technology Swing 100 +20.0% -10.0% Watching
CINF US Financials Swing 100 +19.0% -9.5% Watching
PFG US Financials Swing 100 +15.6% -7.8% Watching
NWSA US Communication Services Swing 100 +18.3% -9.1% Watching
SBUX US Consumer Discretionary Swing 100 +17.6% -8.8% Watching
DXCM US Health Care Swing 100 +20.0% -10.0% Watching
NVDA US Technology Swing 100 +20.0% -10.0% Held
NTRS US Financials Swing 100 +15.8% -7.9% Held
STLD US Materials Swing 90 +20.0% -10.0% Watching
CHTR US Communication Services Squeeze 90 +20.0% -10.0% Watching
KMB US Consumer Staples Swing 90 +19.6% -9.8% Watching
💡 Korea Market 101
A scanner screens hundreds of Korean and US stocks daily and scores them on technical and fundamental criteria (max 100). ‘Target’ is the expected gain if the setup works; ‘Stop’ is the pre-committed maximum loss if it doesn’t — the system always defines the exit before entering. ‘Swing’ rides multi-day trends; ‘Squeeze’ waits for dormant stocks to break out. ‘Watching’ means signal registered but not bought; ‘Held’ means the system actually owns it. ⚠️ This is an algorithm’s candidate list, not investment advice. Korean stock names are shown in Korean.

🤖 System Trading Status

Closed today:

Name Mkt Exit type Held P&L
JB 헌트 트랜스포트 서비시스 US ROTATION_EXIT 5d -0.55%

4 open positions — average unrealized P&L +5.37% (3 winning / 1 losing)

Open positions P&L chart

💡 Korea Market 101
‘Closed’ = sold; ‘open’ = still held. Unrealized P&L assumes selling right now — nothing is locked in until sold. ‘STOP’ means the pre-set safety line was hit and the system sold automatically; ‘ROTATION_EXIT’ means it swapped into a stronger candidate. The one rule this system lives by: cut losses early and automatically, let winners run.

Published 2026-08-19 07:16 KST
For information only — not investment advice or a solicitation. All investment decisions are your own responsibility.

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