| Year | Quarter | Sponsor |
| 2025 | 3rd | Ensolum |
| 2025 | 2nd | Montrose Environmental |
| 2025 | 1st | Westervelt Ecological Services |
| 2024 | 4th | Quandry Consulting |
| 2024 | 3rd | Two Dot Consulting |
| 2024 | 2nd | Pinyon Environmental |
| 2024 | 1st | Occidental Petroleum |
| 2023 | 4th | Meeting was cancelled |
| 2023 | 3rd | Meeting was cancelled |
| 2023 | 2nd | Kinder Morgan |
| 2023 | 1st | BPX |
| 2022 | 4th | Meeting was cancelled |
| 2022 | 3rd | Two Dot Consulting |
| 2022 | 2nd | PDC Energy |
| 2022 | 1st | Two Dot Consulting |
| 2021 | 4th | Occidental Petroleum |
| 2021 | 3rd | Antero Midstream |
| 2021 | 2nd | HighPoint Resources |
| 2021 | 1st | AKA Energy |
| 2020 | 4th | Finley Resources |
| 2020 | 3rd | Meeting was cancelled |
| 2020 | 2nd | Meeting was cancelled |
| 2020 | 1st | LT Environmental |
| 2019 | 4th | SRC Energy and Lockton Companies |
| 2019 | 3rd | PDC Energy and Remington Technology |
| 2019 | 2nd | Jonah Energy and ERM |
| 2019 | 1st | DCP Operating Company, LP and Trihydro |
| 2018 | 4th | PDC Energy and TRC Solutions |
| 2018 | 3rd | Kahuna and TetraTech |
| 2018 | 2nd | Enerplus and Trinity Consultants |
| 2018 | 1st | Tallgrass Energy and CGRS |
| 2017 | 4th | SRC Energy and Waste Connections |
| 2017 | 3rd | Meeting was cancelled |
| 2017 | 2nd | Bonanza Creek Energy and SGS Accutest |
| 2017 | 1st | EnerPlus and Ramboll Environ |
| 2016 | 4th | Synergy Resources Corp. and LT Environmental |
| 2016 | 3rd | Meeting was cancelled |
| 2016 | 2nd | Meeting was cancelled |
| 2016 | 1st | Encana |
| 2015 | 4th | Antero Resources and LT Environmental |
| 2015 | 3rd | Bonanza Creek Energy and Golder Associates |
| 2015 | 2nd | Anadarko Petroleum |
| 2015 | 1st | Bill Barrett Corporation |
| 2014 | 4th | Meeting was cancelled |
| 2014 | 3rd | Noble Energy |
| 2014 | 2nd | Anadarko Petroleum |
| 2014 | 1st | Whiting |
| 2013 | 4th | Williams |
| 2013 | 3rd | Kinder Morgan |
| 2013 | 2nd | WPX Energy |
| 2013 | 1st | Bonanza Creek Energy |
| 2012 | 4th | PDC Energy, Inc. |
| 2012 | 3rd | Whiting |
| 2012 | 2nd | Anschutz Exploration Company |
| 2012 | 1st | El Paso Corporation |
| 2011 | 4th | Noble Energy |
| 2011 | 3rd | DCP Midstream |
| 2011 | 2nd | American Midstream and QEP Resources |
| 2011 | 1st | Williams |
| 2010 | 4th | Noble Energy |
| 2010 | 3rd | Encana Oil & Gas, Inc. |
| 2010 | 2nd | Whiting Petroleum Corp. |
| 2010 | 1st | Anadarko Petroleum Corp. |
| 2009 | 4th | Bill Barrett Corporation |
| 2009 | 3rd | DCP Midstream |
| 2009 | 2nd | Noble Energy |
| 2009 | 1st | Marathon Oil |
| 2008 | 4th | BP |
| 2008 | 3rd | Samson Resources |
| 2008 | 2nd | EnCana Oil & Gas (USA) Inc. |
| 2008 | 1st | Williams |
| 2007 | 4th | K.P. Kauffman Co., Inc. |
| 2007 | 3rd | Anadarko Petroleum Corp. |
| 2007 | 2nd | Whiting Petroleum |
| 2007 | 1st | Kinder Morgan |
| 2006 | 4th | Occidental Petroleum |
| 2006 | 3rd | Duke Energy Field Services |
| 2006 | 2nd | Resolute Natural Resources Co. |
| 2006 | 1st | EnCana Oil & Gas (USA) Inc. |
| 2005 | 4th | Kerr McGee |
| 2005 | 3rd | Williams |
| 2005 | 2nd | Black Hills Energy |
| 2005 | 1st | Newfield Exploration |
| 2004 | 4th | Bill Barrett Corporation |
| 2004 | 3rd | Colorado Interstate Gas |
| 2004 | 2nd | Duke Energy Field Services |
| 2004 | 1st | Evergreen Resources, Inc. |
| 2003 | 4th | Western Gas Resources, Inc. |
| 2003 | 3rd | Marathon Oil |