Books. Penguin Random House (PRH), the world’s largest trade book publisher, is expanding its share of leading the children’s market with its purchase of Little Tiger Group, the London-based publisher and packager of children’s books. As part of the transaction, PRH has also acquired UK-based packager Liontree Publishing which will be brought under Little Tiger Group. Monty Bhatia, the co-founder and CEO of Little Tiger Group will continue to run the business which was founded in 1987 and publishes over 200 titles each year. No terms were disclosed.