Advances & Declines

Stock trading dictionary: meaning, example and how traders use it.

Last updated: October 17, 2026

Definition: Advances & Declines are the counts of stocks that closed higher (advancers) and lower (decliners) on an exchange during a session. Together they measure market breadth: how widely a move is shared across stocks.

How advances and declines work

At the close of each session, an exchange such as the NYSE or Nasdaq reports how many listed issues advanced, declined, or were unchanged. Because each stock counts once regardless of size, these figures show whether a move in a cap-weighted index is supported by most stocks or driven by a handful of large ones.

Common breadth measures built from this data include:

  • Net advances: advancers minus decliners.
  • Advance-decline ratio: advancers divided by decliners.
  • Advance-decline line: a running cumulative total of net advances, plotted over time.

Example: building an advance-decline line

Suppose on Monday 1,800 stocks advance and 1,200 decline, so net advances are +600 and the A/D line moves from a starting value of 0 to 600. On Tuesday 1,300 advance and 1,700 decline, net advances are -400, and the line falls to 200. On Wednesday 2,000 advance and 1,000 decline, adding 1,000, so the line ends at 1,200.

Only the direction and shape of the line matter; the starting value is arbitrary.

How traders use breadth data

Analysts watch whether the A/D line confirms the major indexes. In a healthy bull market, the index and the A/D line tend to make new highs together. If an index keeps rising while the A/D line falls, fewer stocks are participating, a negative divergence that some read as a sign the rally is narrowing.

Breadth readings can also signal extremes. A session where decliners overwhelm advancers can mark capitulation during a correction, while a sudden surge of advancers after a decline is sometimes called a breadth thrust. Sector-level breadth, available in tools like a sector monitor, shows which groups are leading.

Some analysts also track up volume versus down volume, which weights each stock by the shares traded in it rather than counting it once. When the advance-decline line and up-volume measures agree, the breadth signal is generally considered stronger. Many traders review breadth for the NYSE and Nasdaq separately, because the two exchanges list very different mixes of companies and can tell different stories on the same day.

Limitations

Breadth treats a tiny stock the same as a giant one, so it can diverge from the index for long stretches without a turn. Exchange lists include preferred shares, closed-end funds, and other non-operating issues that can distort counts. Divergences are warnings, not timing signals.

Because of these quirks, some analysts build breadth from common stocks only, or use the percentage of stocks trading above a moving average as an alternative gauge of participation.

Frequently asked questions

What is the advance-decline line?

It is a cumulative running total of advancing stocks minus declining stocks. Traders compare its direction with major indexes to judge how broad a market move is.

What does a negative advance-decline mean?

It means more stocks fell than rose during the session. A single negative day is common; a persistent decline in the A/D line while indexes rise suggests weakening breadth.

Where is advance-decline data published?

Exchanges publish daily advancing, declining, and unchanged counts, and most charting platforms and financial websites display them along with derived breadth indicators.

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For information only, not investment advice. See the disclaimer.