What does a StochRSI reading of 100 mean?

A reading of 100 is the most misread number this indicator produces. It looks like a ceiling, it gets called overbought, and the instinct is to treat it as a warning. On a slow chart it is closer to the opposite.

What is actually true when StochRSI reads 100?

It means one specific thing: the current RSI is the highest it has been in the last 14 bars. Not that the stock is expensive. Not that it has risen too far. Not that a reversal is due. Only that momentum is at the top of its own recent range.

That distinction matters because the range is relative. A stock grinding quietly upward can print 100 without having moved much at all, and a stock that doubled can read 50 if the pace of the rise has been steady. The number describes the shape of recent momentum, not the size of the move.

Why does a reading of 100 mean more on a monthly chart?

Because of what a bar represents. On a five minute chart, 14 bars is barely over an hour, and a reading of 100 tells you almost nothing that will still be true after lunch. On a monthly chart, 14 bars is more than a year of trading.

For monthly StochRSI to reach 100, a stock has to have had its strongest run of momentum in over a year, right now. That is a genuinely uncommon condition, and it usually means something structural is going well rather than that a single week went well.

Signal desk goes one step further and also runs an annual screen, where each bar is a whole year and the calculation needs at least 17 annual bars of history before it will produce a reading at all. A stock that maxes out there has been climbing for the better part of two decades.

Does overbought mean a stock will fall?

No. This is the single most useful thing to internalise about momentum indicators.

Overbought is a description of position within a range, not a prediction. Strong trends produce long stretches of overbought readings, because a strong trend is precisely a situation where momentum keeps making new highs relative to its recent past. An indicator that says "this stock has strong momentum" is not telling you to sell it.

The stocks that read overbought most often are the stocks that went up the most. Selling every overbought reading means selling exactly the ones that worked.

What a high reading genuinely does tell you is that this is not a good entry price. Momentum at the top of its range means you would be buying after the fast part of a move. That is a real and useful warning, and it is a warning about timing rather than about the stock.

So what do you do with it?

Separate the two questions. A maxed out reading on a slow chart answers which stock. It does not answer when. Signal desk uses the monthly or annual reading only to decide what goes on the watchlist, and then switches to the daily chart to decide when to act. That split is the whole idea, and it is explained in reading momentum on two timeframes.

How rare is a maxed out monthly reading?

Rarer than it sounds, especially once anything else is asked of the stock.

The monthly screen runs on the last trading day of each month across the NYSE, NASDAQ and AMEX plus the Ibovespa. Reaching K and D at 100 is only the first test. A candidate then has to close its monthly bar green, show above average recent volume, have enough listing history, and clear a short term trend check before the business filters even begin.