Zweig breadth thrust: today's reading
Martin Zweig's signal that a market has gone from washed out to broadly bought in about two weeks, run on US stocks after every close.
No signal. The reading is 54.7%, and a thrust needs it to fall below 40% and then rise above 61.5% within 10 sessions.
Every thrust since 2019
- Apr 24, 2025
- Aug 19, 2024
- Nov 3, 2023
- Mar 31, 2023
- Oct 7, 2020
The rule, exactly
Each session, divide the number of advancing stocks by advancers plus decliners. Take a 10-day exponential average of that share. A breadth thrust is the day the average rises above 61.5% after being below 40% at some point in the previous 10 sessions. The rule is Martin Zweig's, from Winning on Wall Street (1986). We count US stocks priced at $5 or more and trading at least $1 million a day on average.
About the breadth thrust
What is the Zweig breadth thrust?
A signal Martin Zweig described in Winning on Wall Street (1986). Take the share of advancing stocks among all stocks that moved each day, and smooth it with a 10-day average. When that average climbs from below 40% to above 61.5% within 10 trading days, the market has gone from washed out to broadly bought in about two weeks. Zweig saw it as one of the strongest signs that a new advance was starting.
How often does it happen?
Rarely: a few times a decade on the NYSE, usually right after a sharp sell-off. Most of the time the reading drifts between the two lines without a signal, which is why the page shows how close it is and whether a window is open.
Why does this page differ from NYSE figures?
Zweig used NYSE advances and declines. This page counts the US common stocks we track, on the NYSE and Nasdaq, that clear our liquidity floor, so the readings and dates can differ slightly from NYSE-only versions. The rule is the same.
When does it update?
After every US close. The nightly run starts at around 5:30 pm ET.
End-of-day data for common stocks and ADRs on the NYSE, Nasdaq and NYSE American, computed after each US close and dated to the trading session.