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
424B3Form of prospectus reflecting facts events constituting substantive change from last formDec 24, 1996Open 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 formDec 24, 1996Open 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.
8-B12BRegistration of securities of certain successor issuers 12(b) of the Securities Exchange ActDec 12, 1996Open Registration of securities of certain successor issuers 12(b) of the Securities Exchange Act in HTML.Open Registration of securities of certain successor issuers 12(b) of the Securities Exchange Act in DOC file.Open Registration of securities of certain successor issuers 12(b) of the Securities Exchange Act in PDF file.Open Registration of securities of certain successor issuers 12(b) of the Securities Exchange Act in XLS file.
424B1Form of prospectus that discloses information previously omitted from the prospectusNov 21, 1996Open Form of prospectus that discloses information previously omitted from the prospectus in HTML.Open Form of prospectus that discloses information previously omitted from the prospectus in DOC file.Open Form of prospectus that discloses information previously omitted from the prospectus in PDF file.Open Form of prospectus that discloses information previously omitted from the prospectus in XLS file.
424B1Form of prospectus that discloses information previously omitted from the prospectusNov 20, 1996Open Form of prospectus that discloses information previously omitted from the prospectus in HTML.Open Form of prospectus that discloses information previously omitted from the prospectus in DOC file.Open Form of prospectus that discloses information previously omitted from the prospectus in PDF file.Open Form of prospectus that discloses information previously omitted from the prospectus in XLS file.
S-3MEFRegistration of up to an additional 20% of securities for any offering registered on a S-3Nov 19, 1996Open Registration of up to an additional 20% of securities for any offering registered on a S-3 in HTML.Open Registration of up to an additional 20% of securities for any offering registered on a S-3 in DOC file.Open Registration of up to an additional 20% of securities for any offering registered on a S-3 in PDF file.Open Registration of up to an additional 20% of securities for any offering registered on a S-3 in XLS file.
S-3/APre-effective amendment to an S-3 filingNov 19, 1996Open Pre-effective amendment to an S-3 filing in HTML.Open Pre-effective amendment to an S-3 filing in DOC file.Open Pre-effective amendment to an S-3 filing in PDF file.Open Pre-effective amendment to an S-3 filing in XLS file.
424ASubstantive changes from or additions to a prospectus previously filedNov 1, 1996Open Substantive changes from or additions to a prospectus previously filed in HTML.Open Substantive changes from or additions to a prospectus previously filed in DOC file.Open Substantive changes from or additions to a prospectus previously filed in PDF file.Open Substantive changes from or additions to a prospectus previously filed in XLS file.
S-3Simplified registration formOct 28, 1996Open 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.
S-3/APre-effective amendment to an S-3 filingSep 26, 1996Open Pre-effective amendment to an S-3 filing in HTML.Open Pre-effective amendment to an S-3 filing in DOC file.Open Pre-effective amendment to an S-3 filing in PDF file.Open Pre-effective amendment to an S-3 filing in XLS file.
S-3Simplified registration formSep 23, 1996Open 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.
S-8Securities offered to employees pursuant to employee benefit plansJun 28, 1996Open Securities offered to employees pursuant to employee benefit plans in HTML.Open Securities offered to employees pursuant to employee benefit plans in DOC file.Open Securities offered to employees pursuant to employee benefit plans in PDF file.Open Securities offered to employees pursuant to employee benefit plans in XLS file.
Subscribe to Investor Email Alerts
* Required Fields
Scroll to Top