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 Annual Meeting & Proxy 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 listingDec 31, 2003Open 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.CERTNYSCertification by the New York Stock Exchange approving securities for listingDec 15, 2003Open 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%Jun 17, 2003Open 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.SC 13D/AAmendment to a SC 13D filingJun 9, 2003Open Amendment to a SC 13D filing in HTML.Open Amendment to a SC 13D filing in DOC file.Open Amendment to a SC 13D filing in PDF file.Open Amendment to a SC 13D filing in XLS file.SC 13DFiling by person(s) reporting owned shares of common stock in a public company >5%May 29, 2003Open 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.SC 13DFiling by person(s) reporting owned shares of common stock in a public company >5%Apr 3, 2003Open 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 listingMar 31, 2003Open 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.CERTNYSCertification by the New York Stock Exchange approving securities for listingMar 31, 2003Open 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.
