Education · Stage 5 · 06
Earnings: why the NQ leans on a handful of companies
An index of a hundred companies sounds like something no single business can move. It is not. The weighting is by size, a few names carry most of it, and those names publish their results at the one time of day when almost nobody is watching.
Mak · 3 min read · Stage 5, article 6 of 8
Concentration, arriving in practice
The first stage of this path established the shape: because the index is weighted by company size, the largest handful account for a large share of the whole thing, and the smallest members barely register.
The consequence shows up four times a year. When one of the giants reports, the instrument you are trading — an index future, supposedly diversified — can move on the results of a single business. That is not a distortion. It is the index doing exactly what it is defined to do.
The timing is the whole problem
American companies publish either after the close or before the open, deliberately, so the market has time to absorb the information outside trading hours.
Except that the futures market does not close. So the entire reaction happens in the overnight session — in the thin book from the article on inventory, with the mechanics from the article on news — and lands on the screen of anyone who only watches regular hours as a gap they did not see form.
Season, not a day
Results cluster. Four times a year there are a few weeks in which most large companies report within days of each other, so the pattern repeats several evenings in a row. Outside those weeks, this concern largely disappears.
Knowing which weeks those are costs nothing and changes how you read a quiet Tuesday.
What actually moves the price
The same rule as any other release, and it surprises people every quarter: the reaction is to the difference from what was expected, not to whether the numbers were good.
With company results there is a second half that often matters more than the quarter itself — what the company says about the next one. A strong quarter with a cautious outlook and a weak quarter with a confident one do not move price in the directions a headline would suggest.
You do not need to analyse any of this. You need to know that it is happening, because it explains why your instrument is behaving unusually and it tells you the behaviour has a cause with a timetable.
The two-minute check
- Is a major index member reporting today? Any free earnings calendar answers this.
- Before the open or after the close? That tells you whether the reaction lands in your session or in the night.
- Am I willing to hold anything through it? If the answer is no, that is a decision about the afternoon, taken in the morning, which is when decisions are cheap.
And the honest limit
You are not trading the company. You are trading an index's reaction to it, and the index has ninety-nine other members. A large move in one name can be met by the rest going nowhere, or by another giant moving the opposite way on the same evening.
So «results were good» is not a direction for this instrument. What earnings reliably provide is a reason for the overnight session to be one-sided, and the previous articles in this stage are about what to do with that: read the night, note the distance, and watch whether the arriving volume agrees.