Slack Technologies Inc, a corporate chat room startup, has received inquiries about a potential takeover from technology companies, including Amazon.com Inc, 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.
Slack declined to comment, while Amazon did not immediately respond to request for comment.
Slack is a platform where employees can send messages, collaborate, organise and share files.
The technology also integrates with a wide variety of business software – such as Salesforce.com Inc and Microsoft Corp's 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.