Market Breadth Indicators Explained
Price tells you where the index is; market breadth tells you whether to trust it. When a handful of mega-caps drag the S&P up while everything else sinks, breadth warns you before price does.
What is market breadth?
Breadth measures how many stocks are participating in a move. A rally where most stocks rise is healthy; one carried by 3 names is fragile. Breadth is the market's internal strength, under the hood of the index.
Why price alone lies
Cap-weighted indexes can mask a weak market. Breadth divergences — index up, breadth down — often precede pullbacks. Reading breadth keeps you from buying a rally that's quietly rotting.
Key breadth measures
- Advancers vs decliners — the simplest participation read.
- % of stocks above their 50/200-day MA — trend participation.
- New highs vs new lows — leadership health.
- Sector participation — are tailwinds broad or narrow?
Use breadth with the trend
Little Bird's daily read folds sector breadth into the headwind/tailwind signal, so you see whether today's move is broad or hollow without building the indicators yourself. (Learn the framework in how to read the signals.)
Frequently Asked Questions
What is market breadth in simple terms?
How many stocks are taking part in a move. Broad participation = strong, durable; narrow = fragile, prone to reversal.
What's the best breadth indicator?
There's no single best — advance/decline, % above moving averages, and new highs/lows together give a fuller picture than any one alone.
Where can I see market breadth free?
The free daily Market Lean Report includes a sector-participation read so you don't have to assemble breadth indicators manually.
See today's breadth read: Get it in the free daily Market Lean Report, or full sector + ticker detail in the paid report. Related: sector rotation strategy.
Educational content only. Not investment advice.