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Much difference in historic prices between brokers and others

Personal Finance & Money Asked on September 25, 2021

I am analyzing e.g. TUI Group stocks.

In XTB broker we can see peak at around 20 EUR, current price ~5.2 EUR:
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In Exante we can see peak at around 20 EUR, current price ~5.2 EUR:
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But when we check e.g. www.boerse-frankfurt.de (which is the stock exchange website), we can see peak at around 13 EUR, current price ~5.2 EUR:
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The same goes for bloomberg or google, all of them have peak at 13 EUR and current price ~5.2 EUR:

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Why the historic prices differ so greatly in brokers?

One Answer

None of them shows every single price they were traded at - and different sources have different ways to consolidate data. Maybe some take the price every minute, and others take every five minutes, so they would miss a very short spike, etc. Also, some might show the highest and lowest for each slot; others show the average, and so on.

You would need to check each source which time resolution it uses, and how they consolidate the data within each time window.

Correct answer by Aganju on September 25, 2021

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