$Chaparral Energy, Inc. Class A(CHAP)$ 8-K - Current report Filed: 2018-07-25 AccNo: 0001564590-18-017321 Size: 152 KBItem 1.02: Termination of a Material Definitive AgreementItem 3.03: Material Modifications to Rights of Security HoldersItem 8.01: Other EventsItem 9.01: Financial Statements and Exhibits 网页链接