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
SC 13G/AAmendment to a previously filed SC 13GJul 10, 2009Open Amendment to a previously filed SC 13G in HTML.Open Amendment to a previously filed SC 13G in DOC file.Open Amendment to a previously filed SC 13G in PDF file.Open Amendment to a previously filed SC 13G in XLS file.
UPLOADCorrespondence from the SEC to the FilerJul 9, 2009Open Correspondence from the SEC to the Filer in HTML.Open Correspondence from the SEC to the Filer in DOC file.Open Correspondence from the SEC to the Filer in PDF file.Open Correspondence from the SEC to the Filer in XLS file.
25-NSENotification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securitiesJun 15, 2009Open Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities in HTML.Open Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities in DOC file.Open Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities in PDF file.Open Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities in XLS file.
CORRESPCorrespondence from the Filer to the SECMay 20, 2009Open Correspondence from the Filer to the SEC in HTML.Open Correspondence from the Filer to the SEC in DOC file.Open Correspondence from the Filer to the SEC in PDF file.Open Correspondence from the Filer to the SEC in XLS file.
NO ACTNo Action LettersMay 11, 2009Open No Action Letters in HTML.Open No Action Letters in DOC file.Open No Action Letters in PDF file.Open No Action Letters in XLS file.
UPLOADCorrespondence from the SEC to the FilerMay 6, 2009Open Correspondence from the SEC to the Filer in HTML.Open Correspondence from the SEC to the Filer in DOC file.Open Correspondence from the SEC to the Filer in PDF file.Open Correspondence from the SEC to the Filer in XLS file.
UPLOADCorrespondence from the SEC to the FilerMar 27, 2009Open Correspondence from the SEC to the Filer in HTML.Open Correspondence from the SEC to the Filer in DOC file.Open Correspondence from the SEC to the Filer in PDF file.Open Correspondence from the SEC to the Filer in XLS file.
SC 13G/AAmendment to a previously filed SC 13GFeb 17, 2009Open Amendment to a previously filed SC 13G in HTML.Open Amendment to a previously filed SC 13G in DOC file.Open Amendment to a previously filed SC 13G in PDF file.Open Amendment to a previously filed SC 13G in XLS file.
CORRESPCorrespondence from the Filer to the SECFeb 13, 2009Open Correspondence from the Filer to the SEC in HTML.Open Correspondence from the Filer to the SEC in DOC file.Open Correspondence from the Filer to the SEC in PDF file.Open Correspondence from the Filer to the SEC in XLS file.
CERTNYSCertification by the New York Stock Exchange approving securities for listingFeb 12, 2009Open 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.
FWPFree Writing ProspectusFeb 11, 2009Open Free Writing Prospectus in HTML.Open Free Writing Prospectus in DOC file.Open Free Writing Prospectus in PDF file.Open Free Writing Prospectus in XLS file.
SC 13G/AAmendment to a previously filed SC 13GFeb 9, 2009Open Amendment to a previously filed SC 13G in HTML.Open Amendment to a previously filed SC 13G in DOC file.Open Amendment to a previously filed SC 13G in PDF file.Open Amendment to a previously filed SC 13G in XLS file.
SC 13G/AAmendment to a previously filed SC 13GFeb 6, 2009Open Amendment to a previously filed SC 13G in HTML.Open Amendment to a previously filed SC 13G in DOC file.Open Amendment to a previously filed SC 13G in PDF file.Open Amendment to a previously filed SC 13G in XLS file.
UPLOADCorrespondence from the SEC to the FilerJan 30, 2009Open Correspondence from the SEC to the Filer in HTML.Open Correspondence from the SEC to the Filer in DOC file.Open Correspondence from the SEC to the Filer in PDF file.Open Correspondence from the SEC to the Filer in XLS file.
FWPFree Writing ProspectusJan 28, 2009Open Free Writing Prospectus in HTML.Open Free Writing Prospectus in DOC file.Open Free Writing Prospectus in PDF file.Open Free Writing Prospectus in XLS file.
S-3ASRAutomatic shelf registration statement of securities of well-known seasoned issuersJan 27, 2009Open Automatic shelf registration statement of securities of well-known seasoned issuers in HTML.Open Automatic shelf registration statement of securities of well-known seasoned issuers in DOC file.Open Automatic shelf registration statement of securities of well-known seasoned issuers in PDF file.Open Automatic shelf registration statement of securities of well-known seasoned issuers in XLS file.
SC 13G/AAmendment to a previously filed SC 13GJan 13, 2009Open Amendment to a previously filed SC 13G in HTML.Open Amendment to a previously filed SC 13G in DOC file.Open Amendment to a previously filed SC 13G in PDF file.Open Amendment to a previously filed SC 13G in XLS file.
UPLOADCorrespondence from the SEC to the FilerJan 9, 2009Open Correspondence from the SEC to the Filer in HTML.Open Correspondence from the SEC to the Filer in DOC file.Open Correspondence from the SEC to the Filer in PDF file.Open Correspondence from the SEC to the Filer in XLS file.
Subscribe to Investor Email Alerts
* Required Fields
Scroll to Top