iShares S&P500 - changes before US stock market opens

[oxfordmark (Mark L)]

Hey

So the S&P500 tracks US companies. How come, before the USA Stock Market opens, the S&P500 is showing changes today?

Surely it would not until the market opens?

[gmullebr]

That fund is traded on an exchange that is currently open (I assume it’s the London Stock Exchange) and is priced in £.
There are many different versions of the same index tracker.

[xnox (Dimitri John Ledkov)]

And futures market is open, which is a gauge for pricing the ETF.

[anon287192]

Following gmullebr’s point, the market is irrational. The price will fluctuate for no sane reason as long as the market is open. Ignore it.