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I'm afraid I'm not sure I understand what you're asking. Would you mind elaborating? Would you like to know the earliest date for which price history for a stock is available? Or are you asking for something else?
Can EstGuidMeanAtDate return a single number?
Screening RICs with company names in R and Excel API
How do I get data for holidays and weekends in Excel VBA via RHistoryAPI
Trying to convert an Excel search line to python