Microsoft founder Bill Gates, the richest man in the world, went all in on the challenge, building a contraption to drench himself in ice water.
Gates was challenged by Facebook CEO Mark Zuckerberg, who posted his video on the social network last week.
Microsoft CEO Satya Nadella also posted his ice bucket video, with the help of the software giant's employees.
Nadella challenged counterparts Jeff Bezos of Amazon and Larry Page of Google to do the same, and the two also responded with their own videos.
Apple CEO Tim Cook and Twitter CEO Dick Costolos also took the challenge.