SEC Filings

Home / Investors / Financials / SEC Filings
NASDAQ: CHKOTCPK: CHKAQ
YearTrailing 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 1995
ViewAll FilingsAnnual FilingsQuarterly FilingsCurrent FilingsRegistration StatementsSection 16Mergers & AcquisitionsProxy & Information StatementsOther
FormDescriptionDateFormat
DEFA14AAdditional proxy soliciting materials - definitiveJun 4, 2012Open 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.
PX14A6GNotice of exempt solicitation. Definitive materialMay 29, 2012Open 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.
DEFA14AAdditional proxy soliciting materials - definitiveMay 25, 2012Open 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.
DEFA14AAdditional proxy soliciting materials - definitiveMay 23, 2012Open 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.
DEFA14AAdditional proxy soliciting materials - definitiveMay 18, 2012Open 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.
PX14A6GNotice of exempt solicitation. Definitive materialMay 17, 2012Open 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.
PX14A6GNotice of exempt solicitation. Definitive materialMay 14, 2012Open 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.
PX14A6GNotice of exempt solicitation. Definitive materialMay 14, 2012Open 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")May 11, 2012Open 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 - definitiveMay 2, 2012Open 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.
DEFA14AAdditional proxy soliciting materials - definitiveMay 1, 2012Open 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.
DEFA14AAdditional proxy soliciting materials - definitiveApr 26, 2012Open 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.
DFAN14AAdditional proxy soliciting materials filed by non-managementApr 26, 2012Open Additional proxy soliciting materials filed by non-management in HTML.Open Additional proxy soliciting materials filed by non-management in DOC file.Open Additional proxy soliciting materials filed by non-management in PDF file.Open Additional proxy soliciting materials filed by non-management in XLS file.
PRE 14AA preliminary proxy statement providing notification matters to be brought to a voteApr 20, 2012Open A preliminary proxy statement providing notification matters to be brought to a vote in HTML.Open A preliminary proxy statement providing notification matters to be brought to a vote in DOC file.Open A preliminary proxy statement providing notification matters to be brought to a vote in PDF file.Open A preliminary proxy statement providing notification matters to be brought to a vote in XLS file.
Subscribe to Investor Email Alerts
* Required Fields
Scroll to Top