| WELD COUNTY LAND INVESTORS, INC.Denver, CO · Good Standing | Denver, CO | Corporation | Feb 13, 1976 | Good Standing |
| ROMAC EXPLORATION COMPANY, INC.Location not reported, CO · Good Standing | Location not reported, CO | Corporation | Mar 12, 1979 | Good Standing |
| BRUCE P. FIERST, P. C., ATTORNEY AT LAW, Dissolved January 31, 2026Denver, CO · Voluntarily Dissolved | Denver, CO | Corporation | Sep 9, 1980 | Voluntarily Dissolved |
| LA LLCFort Collins, CO · Good Standing | Fort Collins, CO | LLC | Dec 1, 1982 | Good Standing |
| GUTTERSEN & COMPANYLocation not reported, CO · Exists | Location not reported, CO | Partnership | Sep 6, 1983 | Exists |
| ASTRELLA & RICE P.C.Fort Collins, CO · Good Standing | Fort Collins, CO | Corporation | May 29, 1992 | Good Standing |
| ROEHRS EXPLORATION, INC.Location not reported, CO · Good Standing | Location not reported, CO | Corporation | Nov 1, 1994 | Good Standing |
| NORTH AMERICAN POWER CO.Fort Collins, CO · Good Standing | Fort Collins, CO | Corporation | Feb 13, 1995 | Good Standing |
| DEALMAKERS, INC.Location not reported, CO · Good Standing | Location not reported, CO | Corporation | Aug 1, 1995 | Good Standing |
| MAGNUM DRILLING SERVICES, INC.Location not reported, CO · Good Standing | Location not reported, CO | Corporation | Jul 12, 1996 | Good Standing |
| GUTTERSEN EXCHANGE LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Dec 12, 1996 | Good Standing |
| WIEMERS ENGINEERING, LLCRamah, CO · Good Standing | Ramah, CO | LLC | Oct 8, 1999 | Good Standing |
| ROEHRS ENERGY LLCLocation not reported, CO · Good Standing | Location not reported, CO | LLC | Dec 24, 2001 | Good Standing |
| LWM WASHOUT, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Jun 24, 2003 | Good Standing |
| Colt Thomas FoundationFort Collins, CO · Good Standing | Fort Collins, CO | Nonprofit | Jan 10, 2005 | Good Standing |
| Argo Radiant & HVAC Equipment, LLCWestminster, CO · Good Standing | Westminster, CO | LLC | Jan 10, 2007 | Good Standing |
| Art Guttersen, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Sep 7, 2007 | Good Standing |
| Ronin Resources LLCFort Collins, CO · Good Standing | Fort Collins, CO | LLC | Jan 13, 2009 | Good Standing |
| Guttersen Cattle, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Jul 10, 2009 | Good Standing |
| Box M Ranch, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Jul 10, 2009 | Good Standing |
| Triple G Land & Cattle, LLCKersey, CO · Good Standing | Kersey, CO | LLC | Apr 14, 2010 | Good Standing |
| Gusher Oil Field Services, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Oct 26, 2010 | Good Standing |
| Guttersen Service Center, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Nov 12, 2010 | Good Standing |
| Land Preservation LLCFort Collins, CO · Good Standing | Fort Collins, CO | LLC | Nov 21, 2011 | Good Standing |
| St. Michael's Reservoir Estate, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | May 16, 2012 | Good Standing |
| Gusher Services, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Nov 2, 2012 | Good Standing |
| Atlas Energy Services, LLCLasalle, CO · Good Standing | Lasalle, CO | LLC | Feb 6, 2014 | Good Standing |
| Ronin LLCFort Collins, CO · Good Standing | Fort Collins, CO | LLC | Mar 10, 2015 | Good Standing |
| MBSTOG, LLCGrand Lake, CO · Good Standing | Grand Lake, CO | LLC | Jul 11, 2017 | Good Standing |
| Double Check Cattle Company, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Aug 3, 2017 | Good Standing |
| Regico, Inc.Ramah, CO · Good Standing | Ramah, CO | Corporation | Nov 27, 2018 | Good Standing |
| Fortress Energy Services LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Jul 12, 2019 | Good Standing |
| Guttersen Companies LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Feb 17, 2020 | Good Standing |
| Colorado Resource Company, LLCFort Collins, CO · Good Standing | Fort Collins, CO | LLC | Apr 16, 2020 | Good Standing |
| Fortress Development Solutions, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Apr 17, 2020 | Good Standing |
| Fortress Employment Solutions, LLCGreeley, CO · Good Standing | Greeley, CO | LLC | May 21, 2020 | Good Standing |
| 4407 W 29th St LLCGreeley, CO · Good Standing | Greeley, CO | LLC | Jul 12, 2024 | Good Standing |