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 StatementsOtherFormDescriptionDateFormatPX14A6GNotice of exempt solicitation. Definitive materialApr 26, 2018Open Notice of exempt solicitation. Definitive material in HTML.Open Notice of exempt solicitation. Definitive material in DOC file.Open Notice of exempt solicitation. Definitive material in PDF file.Open Notice of exempt solicitation. Definitive material in XLS file.DEF 14AOfficial notification to shareholders of matters to be brought to a vote ("Proxy")Apr 6, 2018Open Official notification to shareholders of matters to be brought to a vote ("Proxy") in HTML.Open Official notification to shareholders of matters to be brought to a vote ("Proxy") in DOC file.Open Official notification to shareholders of matters to be brought to a vote ("Proxy") in PDF file.Open Official notification to shareholders of matters to be brought to a vote ("Proxy") in XLS file.DEFA14AAdditional proxy soliciting materials - definitiveApr 6, 2018Open Additional proxy soliciting materials - definitive in HTML.Open Additional proxy soliciting materials - definitive in DOC file.Open Additional proxy soliciting materials - definitive in PDF file.Open Additional proxy soliciting materials - definitive in XLS file.
