German media giant Bertelsmann AG has said it is prepared to buy back the 25.1% stake owned by Groupe Bruxelles Lambert at a "reasonable price."

German media giant Bertelsmann AG has said it is prepared to buy back the 25.1% stake owned by Groupe Bruxelles Lambert at a "reasonable price."

The announcement came after Bertelsmann's annual general meeting today (May 22), at which the company confirmed that GBL may exercise its rise to demand an initial public offering of the shares.

"The executive board and the majority shareholder are unanimously of the opinion that in the case of such a repurchase, Bertelsmann would be able to continue to invest in its businesses and maintain its solid financial standing," Bertelsmann said in a statement.

Under an agreement from 2001, GBL can formally request a listing for the share from the day after Bertelsmann’s annual meeting.

A sale of GBL's stake could fetch between about €4 billion ($5.1 billion), according to analysts. Unconfirmed reports have suggested Bertelsmann may sell its music activities -- which include its 50% stake in the Sony BMG joint venture -- to fund the buy-back.