Is it possible to get a list of AIM companies the same way im able to pull FTSE100 companies using - instruments = ['0#.FTSE']?
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I am not an Eikon expert - however, the following existing post looks like it will answer your question.
Extracting RICs of LSE AIM companies - Forum | Refinitiv Developer Community
Failing that I recommend you raise an Eikon Content query with My.Refinitiv who may also be able to assist.
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What other parameters can be used with the statement pertaining to Corporate Actions data such as Stock Splits?