List Office 365 Global Administrators via Powershell

Prerequisites

You need to be an Office Global Administrator to run these commands.

You need to be running Powershell as Admin and you need to download

Microsoft Online Services Sign-In Assistant for IT Professionals RTW

Firstly download and install this software:

Then fire up Powershell as Admin and run the following commands:

Install-Module MSOnline

This will install the Office 365 Powershell Module

Connect to Your Office 365 Tenant

Use this command to connect to your Office 365 tenant:

Connect-MsolService

Finally run these two commands and it will display all your Global Administrators

$role = Get-MsolRole -RoleName "Company Administrator"

Get-MsolRoleMember -RoleObjectId $role.ObjectId

Using the Portal to List Global Administrators

You can also login to the Office 365 Portal, Click on Admin > Active Users and then select Global Admins in the Views drop down menu: