What does Is Primary Listing mean?
This indicates whether the company's main listing is in London. There are many dual listed companies on the London exchange who have their primary listing elsewhere. It's value is set to either 1 or 0 where 1 indicates a primary listing in London.
Stockopedia explains Is Primary Listing...
This can be a useful flag for identifying companies eligible for inclusion in tax efficient wrappers like ISAs and SIPPs.
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To filter for primary listed stocks in the relevant exchange, set this value equal to 1, or to find stocks that are primary listed elsewhere set this equal to zero.