Earlier this week, O'Brien raised his holdings to 15.37 percent. Independent News and Media's board views O'Brien as a dissident shareholder. The largest shareholder is the group's Chief Executive, Anthony O'Reilly, who has a 26.5 percent stake in the group, Reuters reported.

O'Reilly's son, Gavin O'Reilly, is chief operating officer of INM, and also president of the World Association of Newspapers' executive committee and board.

A spokesman told MediaGuardian that the papers remain “substantial calling cards” in the group's campaign to acquire new titles around the globe, especially in India and South Africa.