​Marcellus (Mitsui E&P USA LLC)​

• Chesapeake Energy Corporation – Operating partner of Mitsui's Marcellus leases in Pennsylvania through its subsidiary Chesapeake Appalachia LLC.

• Equinor – Non-operating partner in Chesapeake-operated Marcellus leases through its subsidiary, 

• Alta Energy – Non-operating partner in Chesapeake-operated Marcellus leases.

• Williams Partners – Operating partner of Midstream business JV in our Chesapeake-operated Marcellus lease areas.

• Other operating partners under JOAs, such as Chief Oil & Gas LLC,  Southwestern Energy Production Company, Seneca Resources Corporation, Repsol Oil & Gas USA, LLC, and BKV Operating.

​Eagle Ford (Mitsui E&P Texas)

• Mesquite Energy Inc. (formerly Sanchez Energy Corporation) – Operating partner of all of Mitsui's Eagle Ford leases in South Texas through its subsidiary, SN EF Maverick, LLC.

• Venado Oil and Gas – An affiliate of KKR and non-operating partner.

• Korean National Oil Company – Participates in the Eagle Ford project through its subsidiary, Eagle Ford TX LP.

• Western Midstream – Operating partner of Midstream business JV in our Eagle Ford acreage through its subsidiary, Springfield Pipeline LLC.

Kaikias (MOEX North America LLC)

• Shell – Operating partner in the Kaikias Project in the US Gulf of Mexico 

Argentina Malvinas (Mitsui E&P Argentina)

• Eni – Operating partner of MLO-124 block in offshore Argentina through its subsidiary, Eni Argentina Exploración y Explotación.

• Tecpetrol – Non-operating partner of MLO-124 block