S&P 500 20-Day Breadth Thrust Update: The 20-Day Breadth Thrust signal triggered on May 12, 2025, when more than 55% of S&P 500 components hit 20-day highs on the same day.
That surge in participation marked a clear shift in behavior and has historically signaled the start of powerful bull market phases.
We are now 101 trading days into the current breadth thrust regime, which runs for a full 252 trading days or roughly one year. That means the signal is still active and only about 40% complete.
Since the May 12 trigger:
S&P 500: +15.3%
Average post-thrust gain at day 100: +6.4%
This cycle has already outpaced most historical thrusts in both strength and trajectory.
Participation remains broad, and leadership is rotating within strength rather than away from it.
That’s exactly the kind of internal health that sustains a bull market.
Across 37 historical thrusts since 2003, the S&P 500 has been higher 100% of the time one year later, with an average 12-month gain of +16.5%.
When more than half the S&P 500 is making new short-term highs together, it reflects synchronized buying across sectors. That alignment has always been the foundation of strong bull markets.
We are 101 days into a 252-day breadth thrust regime, and the signal remains firmly in play.
Participation is broad, returns are above average, and trend structure is holding strong.
If history is a guide, this is not the end of the run.
It is the middle of a larger expansion phase with plenty of road ahead.
This is not a late-stage rally. It is a healthy, high-energy advance that continues to define the bull market of 2025.