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How can I find data on delisted stocks?
In general you cannot. Once the security is no longer listed on the exchange - it doesn't have to provide information to the exchange and regulators (unless it wants to be re-listed). That's one of the reasons companies go private - to keep their (financial and other) information private. If it was listed in 1999, and is no longer listed now - you can dig through SEC archives for the information. You can try and reach out to the company's investors' relations contact and see if they can help you with the specific information you're looking for.