Change company name for Office 2013, 2016 and 2019

To change the company name for the aforementioned products to something different, open up regedit.exe and go to the following registry key:

HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/Current Version/Installer/Userdata/S-1-5-18/Products/{GUID}/

Where GUID is the GUID for the Office product you have installed. If you have a lot of applications installed, it might be easier to go to - 

HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/Current Version/Installer/U

serdata/S-1-5-18/Products/

And then press F3 to search for the existing company name. When it finds the entry, be sure the product is for the appropriate Office version and then change the value for RegCompany.

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