Daily Report – 2026-09-18


S&P 500 Report

Top 10 Contributors


S&P 500: 7650.50 | 📈 Up (0.24%)

Market Structure Score


46/100

Weak Structure
Multiple internal measures are deteriorating, suggesting an elevated probability of continued weakness.

🔁 Regime shift: Neutral → Weak / Risk-Off
Market Summary
Executive Summary

Selling pressure extended across a broad cross-section of the market, indicating widespread institutional distribution rather than isolated weakness. Internal confirmation remains limited, reducing confidence in the durability of the current market character.

Market Character

Underlying market conditions have weakened sufficiently to raise questions about the durability of the current trend. The Market Structure Score of 46/100 reflects low confidence in this assessment.

Participation

154 of 502 stocks advanced (▲30.7%)
343 stocks declined (▼68.3%)
5 stocks unchanged
Participation quality weakened.
Participation weakened versus recent sessions.

Overall, limited participation weakened confirmation of today’s advance.

Leadership

Leadership outpaced broader participation, highlighting a disconnect between capitalization-weighted performance and the average constituent.

Risk Assessment

Breadth continues to lag headline index performance. Participation has weakened across the broader market. Trading conviction remains below recent norms. Should these conditions deteriorate further, confidence in the current market assessment would likely weaken.

Outlook

The outlook remains cautious until participation broadens, leadership stabilizes, and internal confirmation begins to recover.

Bottom Line

The weight of the internal evidence continues to support a broad distribution market environment with low confidence. While short-term price fluctuations are inevitable, sustained improvement in participation and leadership would reinforce the current assessment, whereas renewed deterioration in market internals would warrant a more defensive interpretation.

Market Signals

▶ ⚠️ Weak participation — selling pressure dominated the session.

▶ 🔍 Leadership remained moderately concentrated.

▶ 📉 Participation deteriorated noticeably from the previous session.

▶ ⚠️ Large-cap leadership outpaced the broader market.

Top Contributors (>0.01%)

Ticker Return Contribution Share Impact_Efficiency Rank
NVDA 1.34% 0.11% 8.30% 0.081569 1
AVGO 2.97% 0.09% 6.90% 0.030490 2
MU 3.92% 0.07% 5.14% 0.017208 3
LRCX 6.98% 0.05% 3.43% 0.006447 4
SNDK 10.99% 0.04% 3.34% 0.003988 5
AMAT 6.51% 0.04% 3.03% 0.006111 6
AMZN 1.00% 0.04% 2.91% 0.038059 7
AMD 2.70% 0.04% 2.70% 0.013094 8
GOOGL 0.42% 0.03% 2.06% 0.063649 9
STX 6.93% 0.02% 1.64% 0.003100 10
KLAC 4.74% 0.02% 1.55% 0.004289 11
TXN 3.29% 0.01% 1.07% 0.004256 12
WDC 4.13% 0.01% 0.94% 0.002994 13
ADI 3.60% 0.01% 0.88% 0.003217 14

Definitions:

Contribution – The weighted impact of a stock’s return on the overall index move
(weight × return). This reflects how much each stock actually moved the index.

Share – The proportion of total index movement attributable to a given stock.
Higher values indicate outsized influence relative to peers.

Impact Efficiency – The ratio of contribution to return, highlighting how effectively
a stock’s price move translates into index impact (primarily driven by index weight).


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