Daily Report – 2026-08-18


S&P 500 Report

Top 10 Contributors


S&P 500: 7691.76 | πŸ“‰ Down (-0.72%)

Market Structure Score


51/100

Fragile Structure
Participation and confirmation have weakened, increasing the risk of unstable price action.
Market Summary
Executive Summary

Institutional positioning became increasingly defensive as participation weakened and investors favored more resilient areas of the market. 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 51/100 reflects low confidence in this assessment.

Participation

225 of 502 stocks advanced (β–²44.8%)
270 stocks declined (β–Ό53.8%)
7 stocks unchanged
Participation quality weakened.
Decliners outnumbered Advancers.

Overall, participation was mixed, reducing confidence in the durability of today’s advance.

Leadership

Leadership continued to rotate across sectors, indicating investors were reallocating capital without abandoning risk exposure. Rotation of this nature is often consistent with a healthy bull market provided participation remains broad.

Risk Assessment

Rapid leadership rotation suggests institutional conviction remains fluid. Participation has weakened across the broader market. Trading conviction remains below recent norms. Decliners continue to outnumber advancers. Should these conditions deteriorate further, confidence in the current market assessment would likely weaken.

Outlook

Meaningful improvement in participation and internal confirmation will be needed before confidence can recover. Failure to improve would leave the market vulnerable to additional weakness.

Bottom Line

The weight of the internal evidence continues to support a defensive rotation 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

▶ ⚠️ Participation remained below average.

▶ πŸ“‰ Cap-weighted participation remained weak.

▶ βœ… Leadership was broadly distributed across the market.

▶ πŸ”„ Leadership rotation accelerated.

▶ πŸš€ Participation expanded sharply from the previous session.

▶ βœ… Participation exceeded capitalization leadership.

▶ πŸ“‰ Declining stocks showed greater magnitude than advancing stocks.

▶ ⚠️ A small group of larger losers weighed disproportionately on returns.

Top Contributors (>0.01%)

Ticker Return Contribution Share Impact_Efficiency Rank
AAPL 1.45% 0.10% 5.37% 0.070144 1
LLY 3.60% 0.05% 2.59% 0.013687 2
JNJ 3.33% 0.03% 1.48% 0.008443 3
XOM 2.54% 0.02% 1.30% 0.009757 4
ABBV 3.43% 0.02% 1.10% 0.006104 5
MSFT 0.27% 0.01% 0.68% 0.048795 6
MA 2.14% 0.01% 0.68% 0.006024 7
BRK-B 0.95% 0.01% 0.67% 0.013472 8
V 1.51% 0.01% 0.66% 0.008265 9
NFLX 2.30% 0.01% 0.64% 0.005287 10

Definitions:

Contribution – The weighted impact of a stock’s return on the overall index move
(weight Γ— 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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