What year did the stocks begin for the following companies. Great Wolf Lodge, Apple, and Exxon?

I consider the initial public offiering as the beginning of a stock even though the company existed

Dec 2004 Great Wolf Lodge initial public offering (IPO)

Dec 1980 Apple IPO

On November 30, 1999, Exxon and Mobil join to form Exxon Mobil Corporation

Exxon was the Standard Oil Trust formed in 1882

In 1972, Exxon changed it name from Jersey Standard

Mobil has been around as Mobil since 1966 but was the Vacuum Oil company since 1866.