SUNNYVALE, California: Carl Icahn, a man who has spent much of the recent past occupying the dual role of most vocal critic and most active investor in ailing search giant Yahoo, has bought a further 6.78 million shares in the company, taking his overall holding to 5.45%. 

In the filing accompanying his most recent purchase, Icahn's various holding companies were reported to have invested in the stock "because they believed that the shares were undervalued".

A filing independent of the share purchase also revealed that Icahn held talks with Microsoft earlier this year about the prospect of the IT giant buying up Yahoo's search operations. 

It also disclosed, however, that there were currently "no understandings" between Icahn and Microsoft regarding any potential deal.

Data sourced from New York Times and; additional content by WARC staff