Orbit, an imprint of Hachette Book Group in the United States.
From their website's about page:
About Orbit US
Launched in 2007, Orbit US is the science fiction and fantasy imprint of Hachette Book Group. Orbit has quickly established itself as one of the market-leading SFF imprints in the US, and the fastest growing imprint in the field. Our authors include New York Times and international bestsellers Joe Abercrombie, M. R. Carey, Gail Carriger, James S. A. Corey, N. K. Jemisin, Ann Leckie, Kim Stanley Robinson, Andrzej Sapkowski, and Brent Weeks.