In 2021, which cloud computing company acquired Slack Technologies?

In 2021, Salesforce acquired Slack Technologies.

Slack began as Tiny Speck, the company behind the online game Glitch, before pivoting to an internal communication tool. Slack launched publicly in 2013 and became a widely used workplace messaging platform, combining persistent chat channels with file sharing, search, integrations, voice, and video features.

Salesforce announced the acquisition in December 2020 for approximately $27.7 billion. The transaction closed on July 21, 2021, making Slack a Salesforce subsidiary. It was Salesforce’s largest acquisition at the time and strengthened its position in workplace collaboration and enterprise software alongside its customer-relationship-management products.

A common mix-up is the year: Salesforce announced the deal in 2020, but completed it in 2021, which is the year used in the question. Slack had also already become a public company through a direct listing on the New York Stock Exchange in 2019. Oracle, Google, and Microsoft all operate major cloud or collaboration businesses, but none acquired Slack.