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 StatementsOtherFormDescriptionDateFormatS-3Simplified registration formApr 27, 2004Open Simplified registration form in HTML.Open Simplified registration form in DOC file.Open Simplified registration form in PDF file.Open Simplified registration form in XLS file.424B3Form of prospectus reflecting facts events constituting substantive change from last formApr 19, 2004Open Form of prospectus reflecting facts events constituting substantive change from last form in HTML.Open Form of prospectus reflecting facts events constituting substantive change from last form in DOC file.Open Form of prospectus reflecting facts events constituting substantive change from last form in PDF file.Open Form of prospectus reflecting facts events constituting substantive change from last form in XLS file.424B3Form of prospectus reflecting facts events constituting substantive change from last formMar 19, 2004Open Form of prospectus reflecting facts events constituting substantive change from last form in HTML.Open Form of prospectus reflecting facts events constituting substantive change from last form in DOC file.Open Form of prospectus reflecting facts events constituting substantive change from last form in PDF file.Open Form of prospectus reflecting facts events constituting substantive change from last form in XLS file.424B3Form of prospectus reflecting facts events constituting substantive change from last formFeb 2, 2004Open Form of prospectus reflecting facts events constituting substantive change from last form in HTML.Open Form of prospectus reflecting facts events constituting substantive change from last form in DOC file.Open Form of prospectus reflecting facts events constituting substantive change from last form in PDF file.Open Form of prospectus reflecting facts events constituting substantive change from last form in XLS file.S-4POS Post-effective amendment to an S-4EF filingJan 23, 2004Open POS Post-effective amendment to an S-4EF filing in HTML.Open POS Post-effective amendment to an S-4EF filing in DOC file.Open POS Post-effective amendment to an S-4EF filing in PDF file.Open POS Post-effective amendment to an S-4EF filing in XLS file.8-A12BRegistration of certain classes of securities 12(b) of the Securities Exchange ActJan 20, 2004Open Registration of certain classes of securities 12(b) of the Securities Exchange Act in HTML.Open Registration of certain classes of securities 12(b) of the Securities Exchange Act in DOC file.Open Registration of certain classes of securities 12(b) of the Securities Exchange Act in PDF file.Open Registration of certain classes of securities 12(b) of the Securities Exchange Act in XLS file.424B3Form of prospectus reflecting facts events constituting substantive change from last formJan 14, 2004Open Form of prospectus reflecting facts events constituting substantive change from last form in HTML.Open Form of prospectus reflecting facts events constituting substantive change from last form in DOC file.Open Form of prospectus reflecting facts events constituting substantive change from last form in PDF file.Open Form of prospectus reflecting facts events constituting substantive change from last form in XLS file.424B2Form of prospectus filed in connection with primary offering of securities on a delayed basisJan 9, 2004Open Form of prospectus filed in connection with primary offering of securities on a delayed basis in HTML.Open Form of prospectus filed in connection with primary offering of securities on a delayed basis in DOC file.Open Form of prospectus filed in connection with primary offering of securities on a delayed basis in PDF file.Open Form of prospectus filed in connection with primary offering of securities on a delayed basis in XLS file.424B2Form of prospectus filed in connection with primary offering of securities on a delayed basisJan 7, 2004Open Form of prospectus filed in connection with primary offering of securities on a delayed basis in HTML.Open Form of prospectus filed in connection with primary offering of securities on a delayed basis in DOC file.Open Form of prospectus filed in connection with primary offering of securities on a delayed basis in PDF file.Open Form of prospectus filed in connection with primary offering of securities on a delayed basis in XLS file.1-25 26-34
