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Where can I find the nominal price of a stock prior a split into multiple companies?
When Hewlett Packard split they changed their name to HP Inc. and spun off Hewlett Packard Enterprise as a new corporation. This means HP Inc. has the same stock history and ticker (HPQ) as Hewlett Packard did so that's the one you want to search for. As you noticed this also means it's impossible to search for old Hewlett Packard's stock performance alone. One free service that seems to show the unadjusted historical stock price of HPQ is Google finance: https://www.google.com/finance?q=NYSE%3AHPQ