Twitter, which has been the subject of takeover rumours before, is getting closer to a sale, according to the US business news channel CNBC.
Potential suitors include Google and Salesforce.com, the report said.
Twitter's board of directors is open to a deal, which could come by the end of the year, according to CNBC.
Last month Twitter shares jumped after comments from co-founder Ev Williams.
When asked on Bloomberg TV whether the company could remain independent he replied: "We're in a strong position now, and as a board member we have to consider the right options."