Change the company name on the AD FS sign-in page
To change the name of the company that is displayed on the sign-in page, use the following Windows PowerShell cmdlet and syntax. This value is set by default by using the value from the Federation Service display name that you entered during setup.
Set-AdfsGlobalWebContent –CompanyName "Contoso Corp"
You can also use the Windows PowerShell Integrated Scripting Environment (ISE) to change the company name. By using the Windows PowerShell ISE, you can display content in a Unicode-compliant environment. For additional information, see Introducing the Windows PowerShell ISE.