How good is the indication of premarket trading for the actual open on the S&P500? Does anyone have a link / study on this? Thanks.
Quote from macrotrader:
If the S&P500 future is down 1% at 9:29 ET, how will the S&P open (adjusting for the disparity between future and cash)? In other words how good of an indication is the pre-market trade and how much of an effect does the first minute of trading have?

Quote from Laissez Faire:
I don`t think you will find any published studies on this, but since you have the questions yourself, you should be able to find the answers on your own as well, which is always better.
If the market is down 1% at 9:29, we have a gap down open and a gap down open usually means something, just like a flat open means something.
But you need more input as well, including prior days trading, etc.
I definitely find the pre-market and overnight high and low important to guide my trading of the ES contract.
A trend in the pre-market does not necessarily continue in the cash session though, so I don`t look into that as much, unless when I find that it is worth looking into.![]()
Quote from Xspurt:
I took the liberty of dividing this answer into 5 parts instead of 4. Each of these sections is hitting the nail on the head and opens up a world of study.
The only thing I would add is that you will get more information if you look at the whole overnight trading as well as pre-market.
