Market Structure · Beta Instability

Market X-Ray

The chart can be fine while participation breaks down underneath. The X-Ray measures it directly — upside beta (on up-days), downside beta (on down-days), asymmetry and instability — across the key structure pairs and 343 names in our indices. Detecting the rotation before price makes it obvious.

vs S&P 500 32% losing upside participation, 33% gaining downside fragility

vs Nasdaq-100 37% losing upside participation, 25% gaining downside fragility

Updated daily · data as of 2026-09-17 · n/a

Latest read The Generals Have Followed Their Troops — the breadth warning becomes price confirmation →

Toolboxes Daily Read → Beta Instability Breadth-of-Breadth · — Mixed participation → Ratio-Quality → Divergence Scanner → Alert Stack → Regime Baselines → Anomaly Score → Directory →

The pairs we watch — full scores

Each pair, decomposed on up-days and down-days separately. These are the published "Troops Leaving Before the Generals" set — now confirmed by price in "The Generals Have Followed Their Troops".

Detailed pair scores load on the next refresh.

Participation breadth — by index (vs S&P 500)

lake 3237 names 32% losing upside participation, 32% gaining downside fragility rubin 125 names 11% losing upside participation, 62% gaining downside fragility halo 100 names 23% losing upside participation, 40% gaining downside fragility euro-ai 65 names 22% losing upside participation, 46% gaining downside fragility aw25 39 names 54% losing upside participation, 23% gaining downside fragility agentic 32 names 47% losing upside participation, 28% gaining downside fragility etfs 14 names 43% losing upside participation, 29% gaining downside fragility

Want a specific name? Open the X-Ray Directory → — search, sort and open any of 3612 names on the full toolbox vs SPY & Nasdaq.

How to read it

For each pair (asset vs benchmark), returns are split into the benchmark's up-days and down-days. Upside β is participation in rallies; downside β is vulnerability in selloffs; asymmetry (up − down) and the participation ratio (up ÷ down) say whether an asset captures more upside than downside. Read across 21 / 63 / 126 / 252 days: a sharp drop at the short horizon while the long looks fine is the early warning.

For information and discussion only — a reading of market internals, not investment advice. Scores are relative and descriptive. Cross-read with the Money Temperature regime.

FAQ · from the current data · as of 2026-09-17

Quick answers

What does the Market X-Ray measure?

It measures market participation and fragility beneath the index price by splitting each pair’s returns into up-day and down-day beta. Upside beta shows participation in rallies, downside beta shows vulnerability in selloffs, and asymmetry (up minus down) shows whether an asset captures more upside than downside. It covers the key structure pairs and the full names universe in the Closelook indices, recomputed daily after the US close.

What is the current structural read on the S&P 500 and Nasdaq-100?

As of 2026-09-17, the read vs the S&P 500 is "32% losing upside participation, 33% gaining downside fragility" and vs the Nasdaq-100 is "37% losing upside participation, 25% gaining downside fragility".

How many names does the Market X-Ray directory cover?

As of 2026-09-17, the X-Ray directory covers 3612 names, ETFs and sector members scored against SPY and Nasdaq-100.

What is the Breadth-of-Breadth score right now?

The Breadth-of-Breadth score refreshes after each US close; the current reading is shown in the toolbox strip above.