What Momentum Actually Measures Now
Momentum used to be the simplest signal on this page: the S&P's rate of change over the last five trading days. That answered one question, has the index moved a lot lately, without checking whether the move meant anything.
The current version asks a harder question: is this a real, confirmed trend, or just price drifting without much behind it. It combines four independent checks, and only calls momentum "active" when a real majority of them agree.
The first is trend structure: is price sitting above its 20-day, 50-day, and 200-day moving averages, stacked in that order. This is the standard test professional traders use to separate a genuine trend from noise, and it takes sustained buying or selling to line all three up cleanly.
The second is a ZLSMA cross, a trend line built to reduce the lag that slows down a normal moving average. A regular moving average confirms a turn well after it's happened. ZLSMA is built to catch that turn earlier, at some cost in extra sensitivity to short-term noise.
The third is breadth: are the market's largest, most-watched companies actually confirming the index's move, or quietly diverging from it. A rally only a handful of mega-cap stocks are driving, while everything else lags, is a more fragile kind of move than one where the largest names lead in step with the broader index.
The fourth is volume. A price move on unusually light trading is a weaker signal than the same move on heavy trading, because volume is a rough proxy for how much real conviction is behind it.
Each check contributes independently, and momentum only reads as a confirmed trend when a real majority line up in the same direction. If they're split, the read stays neutral rather than forcing a call from a mixed picture. This is also why momentum carries more weight than any other single signal here: a confirmed, multi-factor trend is stronger evidence than one day's move in any individual instrument.