Corporate Governance Board of Directors Management Team Sustainability Financials Quarterly Results SEC Filings Non-GAAP Financials Stock Senior Notes Common Stock Warrants Tax Documents Dividends Press Releases Events and Presentations Company Reports Annual Reports Sustainability Reports Climate-Related Analysis Reports Contact SEC Filings Home / Investors / Financials / SEC Filings NASDAQ: CHKOTCPK: CHKAQYearTrailing 12-MonthsCalendar Year 2024Calendar Year 2023Calendar Year 2022Calendar Year 2021Calendar Year 2020Calendar Year 2019Calendar Year 2018Calendar Year 2017Calendar Year 2016Calendar Year 2015Calendar Year 2014Calendar Year 2013Calendar Year 2012Calendar Year 2011Calendar Year 2010Calendar Year 2009Calendar Year 2008Calendar Year 2007Calendar Year 2006Calendar Year 2005Calendar Year 2004Calendar Year 2003Calendar Year 2002Calendar Year 2001Calendar Year 2000Calendar Year 1999Calendar Year 1998Calendar Year 1997Calendar Year 1996Calendar Year 1995ViewAll FilingsAnnual FilingsQuarterly FilingsCurrent FilingsRegistration StatementsSection 16Mergers & AcquisitionsProxy & Information StatementsOtherFormDescriptionDateFormatCERTNYSCertification by the New York Stock Exchange approving securities for listingNov 2, 2004Open Certification by the New York Stock Exchange approving securities for listing in HTML.Open Certification by the New York Stock Exchange approving securities for listing in DOC file.Open Certification by the New York Stock Exchange approving securities for listing in PDF file.Open Certification by the New York Stock Exchange approving securities for listing in XLS file.SC 13DFiling by person(s) reporting owned shares of common stock in a public company >5%Aug 19, 2004Open Filing by person(s) reporting owned shares of common stock in a public company >5% in HTML.Open Filing by person(s) reporting owned shares of common stock in a public company >5% in DOC file.Open Filing by person(s) reporting owned shares of common stock in a public company >5% in PDF file.Open Filing by person(s) reporting owned shares of common stock in a public company >5% in XLS file.CERTNYSCertification by the New York Stock Exchange approving securities for listingJul 29, 2004Open Certification by the New York Stock Exchange approving securities for listing in HTML.Open Certification by the New York Stock Exchange approving securities for listing in DOC file.Open Certification by the New York Stock Exchange approving securities for listing in PDF file.Open Certification by the New York Stock Exchange approving securities for listing in XLS file.25Notification of the removal from listing and registration of matured, redeemed or retired SecuritiesMay 4, 2004Open Notification of the removal from listing and registration of matured, redeemed or retired Securities in HTML.Open Notification of the removal from listing and registration of matured, redeemed or retired Securities in DOC file.Open Notification of the removal from listing and registration of matured, redeemed or retired Securities in PDF file.Open Notification of the removal from listing and registration of matured, redeemed or retired Securities in XLS file.25Notification of the removal from listing and registration of matured, redeemed or retired SecuritiesApr 7, 2004Open Notification of the removal from listing and registration of matured, redeemed or retired Securities in HTML.Open Notification of the removal from listing and registration of matured, redeemed or retired Securities in DOC file.Open Notification of the removal from listing and registration of matured, redeemed or retired Securities in PDF file.Open Notification of the removal from listing and registration of matured, redeemed or retired Securities in XLS file.SC 13GSchedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities by passive investors and certain institutionsFeb 17, 2004Open Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities by passive investors and certain institutions in HTML.Open Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities by passive investors and certain institutions in DOC file.Open Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities by passive investors and certain institutions in PDF file.Open Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities by passive investors and certain institutions in XLS file.CERTNYSCertification by the New York Stock Exchange approving securities for listingJan 29, 2004Open Certification by the New York Stock Exchange approving securities for listing in HTML.Open Certification by the New York Stock Exchange approving securities for listing in DOC file.Open Certification by the New York Stock Exchange approving securities for listing in PDF file.Open Certification by the New York Stock Exchange approving securities for listing in XLS file.
