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Erroneous after hours stock pricing - why?
artyboy
Posts: 2,078 Forumite
Ok so this has been bugging me for a while, and I'm hoping someone can shed some light. I've noticed that quite often, stock prices after 4:30pm (specifically LSE listings here) can sometimes spike or tank significantly. I know there is an auction period after the main market closes, but these movements seem to correct themselves back to the close price next day.
A particularly extreme example today is HSBA - it closed slightly up but appears to have dropped over 5% since.
is this just bad data or is there a genuine reason for why this gets displayed, and then reversed next day?
A particularly extreme example today is HSBA - it closed slightly up but appears to have dropped over 5% since.
is this just bad data or is there a genuine reason for why this gets displayed, and then reversed next day?
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Comments
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Looks like dodgy data. What does the picture look like for LSE:HSBA when you look at different information sources, YouInvest, MSN Money etc.1
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artyboy said:Ok so this has been bugging me for a while, and I'm hoping someone can shed some light. I've noticed that quite often, stock prices after 4:30pm (specifically LSE listings here) can sometimes spike or tank significantly. I know there is an auction period after the main market closes, but these movements seem to correct themselves back to the close price next day.
A particularly extreme example today is HSBA - it closed slightly up but appears to have dropped over 5% since.
is this just bad data or is there a genuine reason for why this gets displayed, and then reversed next day?Stop using Google? The LSE's price should always be correct and that's not what it says:
This price is determined by the outcome of the end of day auction (16:35):
https://www.londonstockexchange.com/stock/HSBA/hsbc-holdings-plc/company-page
TradingView is displaying the correct price:
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dodgy data then... thanks.0
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Google is picking up the last reported after-hours trade which happened to be at a significantly discounted price compared with all other trades.
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