BofA's breadth gauge is nearing its sell trigger again. Its record says pullback, not bear market.

Bank of America keeps a running count of the world's stock markets, and the number to watch right now is 82%: that is the share of global equity indices trading above both their 50-day and 200-day moving averages, the firm's "global breadth rule." The reading sits within six points of the 88% level that counts as a contrarian sell signal, and BofA has not been this close to its own line since the gauge actually fired back in late January. The reflex on any "BofA warns" headline is to ask how much to sell. The more useful question is what this signal measures and what its record really delivers — because the answer is a specific, bounded, recoverable stumble, not a bear market.

For anyone new to the mechanic, it is simple. A 200-day moving average is just the average closing price over the past ten months; an index holding above it is in a confirmed uptrend. When four out of five global indices sit above both averages at once, participation has become nearly universal — and that is precisely the contrarian worry. A rally that everyone is already in has nobody left to buy it. BofA's gauge is a crowding detector, not a prosperity forecast. The exceptions make the point: only China, India, and Brazil are not flashing overbought, and the bank uses the same 88% line in reverse as a contrarian buy signal when that many indices fall below their averages. It is symmetric about crowd extremes.

The calibration is what turns the warning from scary into usable. When the breadth rule has fired in the past, global stocks have averaged declines of 2% to 3% over the next two to three months — not the profile of an indicator calling a crash. BofA's separate Bull & Bear Indicator agrees, and it is even further extended: at 9.6, its highest reading since 2021, above the 8.0 level that counts as an outright sell. Since 2002 that gauge has flashed 17 sell signals, followed on average by a 2% to 3% drawdown in global stocks over three months, with a worst case of 15% to 20% and the signal typically working off over one to three months. The shallow end of that range is where buying opportunities get minted; the deep end is a reminder of what extended markets can still do.

The market already ran this experiment once in 2026, and the honest version is two-sided. In the week ended January 28, 89% of the MSCI stock indexes BofA tracks traded above both moving averages, and the sell signal fired just as the MSCI World index touched an all-time high. What followed was not a two-point blip. The Bull & Bear sell signal that had been running since mid-December did not stand down until late March, by which point the S&P 500 still had not officially entered a correction — it sat roughly a hundred points from the 10% line — even as 67% of its members traded more than 10% below their own peaks and 28% sat more than 20% off. BofA's Michael Hartnett said it was "too early to call a market bottom." Then stocks recovered. As of this week, the S&P 500's exchange-traded fund (SPY) trades within about a percent of its 52-week high, up roughly 13% year to date, comfortably above both of its moving averages. The lesson cuts both ways: the warning preceded real internal damage — most stocks fell hard even though the index itself never confirmed a correction — and that damage was fully repaired within months.

And the strategist running these gauges is not running for the exits. Michael Hartnett this week kept his stance of long stocks, long investment-grade bonds, short government bonds, and short the dollar, even while flagging how close the gauge sits to its trigger, and fund inflows are still landing in nearly every asset class. He is not calling the top. He is saying the market is priced for near-perfection and the easy money from broad participation is behind it — exactly the condition this gauge exists to flag.

That distinction is the whole thing. A breadth reading near its trigger is a timing signal, not a thesis. It argues for patience and dry powder — cash to deploy when a crowded market tips and hands quality stocks a shallow dip that resets the entry without cracking the fundamentals. It argues against chasing the most extended momentum names at all-time highs, because the most-crowded names tend to get hit first when a broad rally wobbles. It does not argue for selling businesses whose numbers you have already tested. And the trigger still has not fired: 82 is below 88. If it crosses and the wobble follows, the signal did its job; if it crosses and nothing happens, it will have joined the long list of contrarian calls that beat the odds. Either way the endgame is the same — demand better prices for new money, and let a stretched market hand them to you.