Holtzbrinck’s Pan Macmillan division has acquired British children’s publisher Kingfisher from Houghton Mifflin for an undisclosed sum. The company, which publishes about 100 titles annually—including fiction, nonfiction and reference titles—has an active backlist in the U.S. of over 700 titles.

Simon Boughton, publisher of Holtzbrinck’s Roaring Brook Press imprint, will now oversee U.S. operations for Kingfisher. Boughton said Kingfisher’s backlist includes a number of titles not yet published in the U.S., and that he plans to form a small U.S. staff presence for the imprint at Holtzbrinck. In the U.K., where nearly all of Kingfisher’s titles are generated, the company will fall under the umbrella of Macmillan Children’s Books, becoming an imprint of the U.K. division.