Twitter stock increased more than 4 percent after a report today claiming that Google has tapped financial advisory firm Lazard to help it consider bidding on Twitter.

Google worked with Lazard for its acquisition of Apigee earlier this year, according to Bloomberg, citing an unnamed source.

Disney and Salesforce are also rumored to be evaluating their own bids on Twitter. The initial report that Google and Salesforce were both interested led Twitter stock to spike 20 percent.

In August, Twitter cofounder and board member Ev Williams told Bloomberg that “as a board member we have to consider the right options.”

In July, Twitter missed expectations on revenue for the second quarter of the year, coming up with $602 million. Meanwhile, the social network’s growth rate for monthly active users has been on the decline.

Google declined to comment. A Lazard representative did not immediately respond to a request for comment.