I'm trying to analyze data for delisted securities but don't understand how to identify them in AddSecurity. If I use the plain ticker, it will just find the most recent instance of a security with that ticker but in many cases, delisted tickers are later reused.

An example is “EAGL” which is the ticker for four different SPACs that IPO'd in 2011, 2013, 2015 and 2018, respectively. When I lookup the security with AddEquity("EAGL") and then get the history for it, it only covers the fourth version of EAGL - the one that IPO'd in 2018.

Is there a function that will return a list of all historical instances of a security given a ticker?

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