SEC Filings

Home / Investors / Financials / SEC Filings
NASDAQ: CHKOTCPK: CHKAQ
YearCalendar Year 2021Calendar Year 2020
ViewAll FilingsQuarterly FilingsCurrent FilingsRegistration StatementsSection 16Other
FormDescriptionDateFormat
8-A12BRegistration of certain classes of securities 12(b) of the Securities Exchange ActFeb 9, 2021Open Registration of certain classes of securities 12(b) of the Securities Exchange Act in HTML.Open Registration of certain classes of securities 12(b) of the Securities Exchange Act in DOC file.Open Registration of certain classes of securities 12(b) of the Securities Exchange Act in PDF file.Open Registration of certain classes of securities 12(b) of the Securities Exchange Act in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
POS AMPost-effective amendment to an S-Type filingFeb 9, 2021Open Post-effective amendment to an S-Type filing in HTML.Open Post-effective amendment to an S-Type filing in DOC file.Open Post-effective amendment to an S-Type filing in PDF file.Open Post-effective amendment to an S-Type filing in XLS file.
POS AMPost-effective amendment to an S-Type filingFeb 9, 2021Open Post-effective amendment to an S-Type filing in HTML.Open Post-effective amendment to an S-Type filing in DOC file.Open Post-effective amendment to an S-Type filing in PDF file.Open Post-effective amendment to an S-Type filing in XLS file.
POS AMPost-effective amendment to an S-Type filingFeb 9, 2021Open Post-effective amendment to an S-Type filing in HTML.Open Post-effective amendment to an S-Type filing in DOC file.Open Post-effective amendment to an S-Type filing in PDF file.Open Post-effective amendment to an S-Type filing in XLS file.
POS AMPost-effective amendment to an S-Type filingFeb 9, 2021Open Post-effective amendment to an S-Type filing in HTML.Open Post-effective amendment to an S-Type filing in DOC file.Open Post-effective amendment to an S-Type filing in PDF file.Open Post-effective amendment to an S-Type filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
S-8 POSPost-effective amendment to an S-8 filingFeb 9, 2021Open Post-effective amendment to an S-8 filing in HTML.Open Post-effective amendment to an S-8 filing in DOC file.Open Post-effective amendment to an S-8 filing in PDF file.Open Post-effective amendment to an S-8 filing in XLS file.
1-25      26-37
Subscribe to Investor Email Alerts
* Required Fields
Scroll to Top