$Chaparral Energy, Inc. Class A(CHAP)$ 8-K - Current report Filed: 2018-06-07 AccNo: 0001564590-18-015181 Size: 456 KBItem 1.01: Entry into a Material Definitive AgreementItem 5.02: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Cert 网页链接