Nobel Energy is cutting its Denver office staff by about one-third, relocating 100 jobs to Greeley and Houston. The company, which is the second-largest oil and gas producer in Colorado, has about 770 employees in the state, 300 of whom are in its Downtown Denver office at 1625 Broadway, the Denver Business Journal reports.

The shift will be completed in the next few months, leaving the Downtown Denver office with about 200 employees. According to the company, it needs to focus on its three remaining areas of operation: Colorado’s Denver-Julesburg Basin, the Delaware Basin in Texas and offshore in the Eastern Mediterranean. Nobel recently sold its assets in the Marcellus shale in northern West Virginia and southern Pennsylvania.

Houston-based Nobel also recently acquired Clayton Williams Energy based in Midland, Texas, ramping up its operations in that state.