Exhibit 99 Form 3 Joint Filer Information Name: Gary R. Petersen Address: 1100 LOUISIANA STREET, SUITE 4900 HOUSTON, TX 77002 Designated Filer: RNBD GP LLC Issuer & Ticket Symbol: ECLIPSE RESOURCES CORPORATION [ECR] Date of Event Requiring Statement: 06/24/2014 Signature: /s/ Gary R. Petersen --------------------------------------- Date: 06/26/2014 Name: David B. Miller Address: 1100 LOUISIANA STREET, SUITE 4900 HOUSTON, TX 77002 Designated Filer: RNBD GP LLC Issuer & Ticket Symbol: ECLIPSE RESOURCES CORPORATION [ECR] Date of Event Requiring Statement: 06/24/2014 Signature: /s/ David B. Miller --------------------------------------- Date: 06/26/2014