Not sure what you mean by "valid". The ticker is gone. The stock is no longer valid or represented as a publicly traded security in any form.
If you are referring to its claim to assets of the company through its common stock...well I think it is a pretty safe bet there is nothing at all. At least in bankruptcy there are usually some assets against the debt.
I don't think there is even a business registration anymore.
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.