Are after-hours moves in stocks more likely to be reversed?

[murray t turtle]

On Yahoo Finance I sometimes see large moves in stocks after hours. Are they more likely to be reversed than moves during normal trading hours? My guess is that for less liquid stocks, and for stocks that do not have news such as earnings, that moves after 4pm tend to be partly reversed by the next open, but I wonder if someone has studied this.

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Like the EliteTrader noted ''sometimes'' LOL.
WSJ tends to print SPY trades in extended hours[post market] .Mostly SPY penny moves\ almost never much moves. So does a penny or 2 cents SPY reversal mean much?? Not to me
Looks like single stocks may differ; + an earnings surprize maybe helped/ in post market.
Premarket sales/ i seldom do that/ bids not moving enough for me. Others may differ.