A red index can hide a day where most stocks rose.
Let me back up, because this is one of the most misread numbers on your screen. It is called the advance-decline line, and all it does is count how many stocks went up today versus how many went down. More advancers than decliners, the line rises.
More decliners, it falls. People treat it like a crystal ball, but it is just a headcount.
Here is why that headcount matters more than you think. The S&P is not 500 equal stocks.
It is a handful of giants and a few hundred names that barely move the needle.
There are 450 companies in that index that are peanuts next to the big tech monsters.
So a few heavy names can drag the index down hard while the other 490 stocks are quietly green.
Look only at the S&P and you would swear it was an ugly day. Look at the headcount and you would see most stocks actually closed higher.
That is exactly what happened yesterday. The index closed in the red, but more than 350 stocks inside it finished up.
The weight is parked in a few tech names, so when they get hit, the whole index looks sick even when the typical stock had a fine day.
This is the real job of the advance-decline line. It tells you whether a sell-off is actually a sell-off.
When the index drops and you see a lot more decliners than advancers, that is broad. That is real.
Everybody is getting hit, and you should respect it. But when the index drops and the advancers are winning anyway, that is not a sell-off.
That is rotation, money leaving a few heavy names and moving somewhere else, and the index is lying to you about how bad it is.
Now, the textbook will tell you a falling breadth line is a warning, fewer and fewer stocks holding the market up.
Sometimes it is. A real top usually does show breadth rolling over first. But you cannot read the number blind. You have to ask whether the whole market is selling or just the names that carry the index.
And here is the part that matters for what comes next.
Rotation is not capitulation. As long as money can keep rotating from one sector to the next, the selling never finishes. It is musical chairs. Nobody is done selling Amazon, they just rotate into the next name, and the game keeps going.
You do not get a real bottom until everything sells off together, in lockstep, the whole board red at once.
That is when the chairs run out. Until you see that, you are not home yet, and right now we are nowhere close.
So stop reading a red index as a bad day and a green one as a good day. Pull the headcount.
Ask whether the whole market is moving or just the few names that carry it. One is a sell-off. The other is rotation wearing a sell-off’s clothes.
This Friday, I want to read the tape with you live while it happens. The SpaceX IPO hits, the biggest one ever, and I am going live all day with Brandon Chapman, Blake Young, Tony Rago, and the rest of the crew for a free event we are calling SpaceX IPO Friday Funday.
We start at 9:15 AM ET and run through the close, breaking down the market in real time and trading the IPO as it develops, right alongside you. No cost, one time only.
To your success,
Don Kaufman
