GUETERSLOH – Bertelsmann now owns 100% of shares in Penguin Random House, the world's largest trade publishing group. The media conglomerate, which owns music company BMG, had needed regulatory approvals in able to complete its purchase of the remaining 25% of PRH from rival Pearson.Penguin Random House is home to around 320 individual book publishing imprints across six continents, with more than 15,000 new publications and over 600 million titles sold per year.