$Chaparral Energy, Inc. Class A(CHAP)$ 8-K - Current report Filed: 2018-08-14 AccNo: 0001193125-18-248007 Size: 10 MBItem 2.02: Results of Operations and Financial ConditionItem 7.01: Regulation FD DisclosureItem 9.01: Financial Statements and Exhibits 网页链接