The Telegraaf Media Groep has opened its books to Dutch investor John de Mol’s Talpa investment company, various media sources revealed on Wednesday. The move will enable Talpa to make a more accurate valuation of TMG.

The books for Holland’s largest media group had already been opened to a rival bidder which is a combine of Belgium’s Mediahuis and VP Exploitatie. The latter is an investment company for the Van Puijenbroek family which is the largest single shareholder in TMG.

Talpa’s director John de Mol made a €5.90 per share bid for TMG in mid-January, well above the rival €5.25 offer floated by Mediahuis and VP Exploitatie in December.

Nearly all other Dutch newspapers are now owned by Belgian media interests.