Where can I find the nominal price of a stock prior a split into multiple companies?
In my case, I am searching the price of Hewlett Packard before it split into Hewlett Packard Enterprise and HP inc. on 2015-11-05. On every website I looked for I cannot find the old stock. I can only find the two newly created stocks, HPQ and HPE with all historical prices listed "adjusted". I know that the stock trades around $26 USD before the split, but I need the exact amount for income tax purposes.
My question might be a duplicate of How to find historical stock price for a de-listed or defunct company?, but I am asking since the answer could be different as the company is not defunct, but transformed. Is the old Hewlett Packard considered delisted?