Exhibit 21.1
NOBLE MIDSTREAM PARTNERS LP
SUBSIDIARIES
| General Partner or Sole Member | Limited Partner | ||||||||||||||
| Subsidiary | Name | Percent Ownership | Name | Percent Ownership | Jurisdiction of Organization | Direct/Indirect Ownership Percentage Held by NBLX | |||||||||
| Noble Midstream Services, LLC | Noble Midstream Partners LP | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| Colorado River DevCo GP LLC | Noble Midstream Services, LLC | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| Colorado River DevCo LP | Colorado River DevCo GP LLC | 80 | % | Noble Midstream Services, LLC | 20 | % | Delaware | 100 | % | ||||||
| San Juan River DevCo GP LLC | Noble Midstream Services, LLC | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| San Juan River DevCo LP | San Juan River DevCo GP LLC | 25 | % | NBL Midstream, LLC* | 75 | % | Delaware | 25 | % | ||||||
| Green River DevCo GP LLC | Noble Midstream Services, LLC | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| Green River DevCo LP | Green River DevCo GP LLC | 25 | % | NBL Midstream, LLC* | 75 | % | Delaware | 25 | % | ||||||
| Laramie River DevCo GP LLC | Noble Midstream Services, LLC | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| Laramie River DevCo LP | Laramie River DevCo GP LLC | 5 | % | Noble Midstream Services, LLC | 95 | % | Delaware | 100 | % | ||||||
| Blanco River DevCo GP LLC | Noble Midstream Services, LLC | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| Blanco River DevCo LP | Blanco River DevCo GP LLC | 40 | % | NBL Midstream, LLC* | 60 | % | Delaware | 40 | % | ||||||
| Gunnison River DevCo GP LLC | Noble Midstream Services, LLC | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| Gunnison River DevCo LP | Gunnison River DevCo GP LLC | 5 | % | NBL Midstream, LLC* | 95 | % | Delaware | 5 | % | ||||||
| Trinity River DevCo LLC | Noble Midstream Services, LLC | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| Advantage Pipeline, L.L.C. | Trinity River DevCo LLC | 50 | % | N/A | — | % | Delaware | 50 | % | ||||||
| Black Diamond Gathering Holdings LLC | Laramie River DevCo LP | 100 | % | N/A | — | % | Delaware | 100 | % | ||||||
| Black Diamond Gathering LLC | Black Diamond Gathering Holdings LLC | 54.4 | % | Greenfield Midstream, LLC* | 45.6 | % | Delaware | 54.4 | % | ||||||
| Saddle Butte Rockies Midstream, LLC | Black Diamond Gathering LLC | 100 | % | N/A | — | % | Delaware | 54.4 | % | ||||||
| Saddle Butte Rockies Storage and Terminals, LLC | Saddle Butte Rockies Midstream, LLC | 100 | % | N/A | — | % | Delaware | 54.4 | % | ||||||
| Optimized Energy Solutions, LLC | Black Diamond Gathering LLC | 100 | % | N/A | — | % | Delaware | 54.4 | % | ||||||
| * | Not a subsidiary of NBLX. |