whats the best way to accurately figure out if a stock will gap up or down at the open...premarket data? Nasdaq 100 premarket indicator?
no way to predict accurately. but big changes happen around big news such as earnings release, FDA decisions, etc.
%% Best way is exspect up gaps above 200dma, ETFs; gaps down in bear. That can work in stocks, but earnings can goof them down more. NEVER have noticed many or any/patterns in irregular hours, but a huge herd of elephants, in post market is bullish., BUYing a gap up this late in the year, no thanks; but below 50 dma,[close below 50 dma] may sell it/MAY. I never believed the nonsense '' sell in MAY/HEY/+stay away ''.Quitters never win;prefer a stay- cation as Dave Ramsey says, rather than a vacation this year.
%% That+ plenty of discretion.And once it gets or gaps below 200 day moving average =most likely going down more.[ NOT a prediction. I saw a good IBD chart; one can buy the 52 week HIGH/SPY, for 40 years + most likely still make a fortune if that is done about 40 years.],