Paul Allen, who died in October 2018, was the co-founder of

Paul Allen, who died in October 2018, was the co-founder of Microsoft.

Oracle is a multinational computer technology corporation headquartered in Redwood Shores, California.

IBM is an American multinational technology corporation headquartered in Armonk, New York, with operations in over 170 countries.

SAP SE is a German multinational software company headquartered in Walldorf, Baden-Württemberg.

Microsoft is an American multinational technology company that produces computer software, consumer electronics, personal computers, and related services. Its best known software products are the Microsoft Windows line of operating systems, the Microsoft Office suite, and the Internet Explorer and Edge web browsers. Its flagship hardware products are the Xbox video game consoles and the Microsoft Surface lineup of touchscreen personal computers. As of 2016, it is the world’s largest software maker by revenue.