Daily Report – 2026-08-19


S&P 500 Report

Top 10 Contributors


S&P 500: 7707.98 | 📈 Up (0.14%)

Market Structure Score


84/100

Strong Structure
Most internal measures are aligned, supporting a constructive market backdrop.

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

Internal activity reflected active sector rotation rather than a decisive directional trend, with capital continuing to migrate between market leadership groups. Multiple independent internal indicators aligned with this assessment, resulting in a high-conviction market signal.

Market Character

Most internal measures remain supportive of the prevailing trend, although enough divergence persists to justify a measured rather than aggressive level of conviction. The Market Structure Score of 84/100 reflects high confidence in this assessment.

Participation

284 of 502 stocks advanced (▲56.6%)
213 stocks declined (▼42.4%)
5 stocks unchanged
Advancers clearly outnumbered Decliners.
Participation quality weakened.

Overall, participation remained sufficiently broad to confirm 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. Should these conditions deteriorate further, confidence in the current market assessment would likely weaken.

Outlook

The current backdrop remains constructive. Continued improvement in participation and leadership would strengthen confidence in the prevailing trend, while renewed deterioration in breadth or conviction would argue for a more cautious interpretation.

Bottom Line

The weight of the internal evidence continues to support a orderly sector rotation market environment with high 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

▶ ✅ Leadership was broadly distributed across the market.

▶ ⚠️ Elevated dispersion reflects increasingly uneven market behavior.

▶ 💪 Individual stock moves carried above-average conviction.

▶ 🚀 Participation expanded sharply from the previous session.

▶ 💹 Winning stocks outperformed losers by a comfortable margin.

▶ ⭐ Performance was boosted by a handful of outsized winners.

Top Contributors (>0.01%)

Ticker Return Contribution Share Impact_Efficiency Rank
AAPL 2.19% 0.15% 7.66% 0.070144 1
AMZN 2.46% 0.09% 4.67% 0.038059 2
TSLA 4.23% 0.08% 3.81% 0.018065 3
LLY 4.46% 0.06% 3.04% 0.013687 4
MRK 12.60% 0.06% 2.88% 0.004582 5
MRNA 176.97% 0.05% 2.43% 0.000276 6
MSFT 0.56% 0.03% 1.35% 0.048795 7
NFLX 3.15% 0.02% 0.83% 0.005287 8
ABBV 2.72% 0.02% 0.83% 0.006104 9
NEM 7.85% 0.01% 0.71% 0.001813 10
CRM 5.07% 0.01% 0.69% 0.002716 11
NOW 6.45% 0.01% 0.62% 0.001918 12
TMO 4.16% 0.01% 0.58% 0.002781 13
AMGN 4.02% 0.01% 0.57% 0.002858 14
DHR 5.97% 0.01% 0.54% 0.001805 15
PLTR 2.13% 0.01% 0.53% 0.004972 16
UBER 4.53% 0.01% 0.51% 0.002282 17
ACN 5.92% 0.01% 0.50% 0.001690 18

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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