Premarket price ????????????

Hi all,

I have been trading for couple of months and one thing I cannot understand is how does the share price change in the pre-market adjustment?

What affects this change in price of share from 9:05 to 9:15 am ?

as far as nasdaq and nyse is concerned, one can trade pre-market. its just that the liquidity is very low, volume is thin and spreads kinda tend to be higher.

not really sure, but sgx nifty opens b4 our bse/nse and the trades there kinda affect the trades here (pre-market)