Stewart Butterfield, CEO of Slack, talks during the business messaging company's event in San Francisco, California January 31, 2017. REUTERS/Beck Diefenbach

(Reuters) - Slack Technologies Inc, a corporate chatroom startup, has received inquiries about a potential takeover from technology companies, including Amazon.com Inc AMZN.O, Bloomberg reported on Thursday.

A deal could value the company at at least $9 billion, the report said, citing people with knowledge of the matter. (bloom.bg/2s3CqrD)

Slack declined to comment, while Amazon did not immediately respond to request for comment.

Slack is a platform where employees can send messages, collaborate, organize and share files.

The technology also integrates with a wide variety of business software - such as Salesforce.com Inc CRM.N and Microsoft Corp's MSFT.O Skype.

The San Francisco-based company has raised more than $500 million from venture capitalists and was valued at $3.8 billion at its last private financing round a year ago.