XigniteGlobalHistorical supports inactive securities after 9/1/2010. This means that it is possible for you to retrieve accurate pricing information for any delisted security after 9/1/2010. Inactive securities will not appear in ListSymbols, however, their price can still be retrieved.
You can use the 'IdentifierAsOfDate' to query for inactive securities where the symbol was reused. Leaving this value blank for delisted securities without reused symbols will work, however it is recommended to input the last active date to avoid future symbology conflict.
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