The Independent parent company last night confirmed that O'Reilly had bought a further 2m company shares, priced at €2.15 -- bringing the total amount he has spent on shares in the past week to €25m, or almost £20m.
The move comes after the group issued a statement last week publicly responding for the first time to calls from Irish billionaire and IN&M shareholder O'Brien to sell its two loss-making Independent titles in London.
in the company since late 2006, and now holds 21.07%.
His frequent comments about the company's strategy have prompted IN&M to label him a "dissident shareholder".
In a statement last week, IN&M said: "Mr O'Brien has made a series of personalised, misleading and inaccurate attacks on the company, its board, management, strategy and governance."
IN&M shares dropped marginally in early trading this morning, down 1.9% to €2.12.