SEC Filings

Select the filing type and date range you wish to view from the drop-down menus below.

OTCPK: CTKYYNYSE: CTK

YearTrailing 12-MonthsCalendar Year 2023Calendar Year 2022Calendar Year 2021Calendar Year 2020Calendar Year 2019Calendar Year 2018

ViewAll FilingsAnnual FilingsCurrent FilingsRegistration StatementsOther

Form	Description	Date	Format
SC 13G/A	Amendment to a previously filed SC 13G	Feb 1, 2023	Open 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/A	Amendment to a previously filed SC 13G	Feb 1, 2023	Open 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.
20-F/A	Amendment to a previously filed 20-F	Dec 22, 2022	Open Amendment to a previously filed 20-F in HTML.Open Amendment to a previously filed 20-F in DOC file.Open Amendment to a previously filed 20-F in PDF file.Open Amendment to a previously filed 20-F in XLS file.Open Amendment to a previously filed 20-F in XBLR Viewer.Open Amendment to a previously filed 20-F in XBLR file.
6-K	Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act	Nov 29, 2022	Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in HTML.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in DOC file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in PDF file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in XLS file.
25-NSE	Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities	Jun 6, 2022	Open 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.
6-K	Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act	May 20, 2022	Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in HTML.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in DOC file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in PDF file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in XLS file.
F-6 POS	Post-effective amendment to a previously filed F-6	May 9, 2022	Open Post-effective amendment to a previously filed F-6 in HTML.Open Post-effective amendment to a previously filed F-6 in DOC file.Open Post-effective amendment to a previously filed F-6 in PDF file.Open Post-effective amendment to a previously filed F-6 in XLS file.
6-K	Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act	May 6, 2022	Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in HTML.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in DOC file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in PDF file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in XLS file.
20-F	Registration of securities of foreign private issuers pursuant to section 12(b) or (g)	Apr 29, 2022	Open Registration of securities of foreign private issuers pursuant to section 12(b) or (g) in HTML.Open Registration of securities of foreign private issuers pursuant to section 12(b) or (g) in DOC file.Open Registration of securities of foreign private issuers pursuant to section 12(b) or (g) in PDF file.Open Registration of securities of foreign private issuers pursuant to section 12(b) or (g) in XLS file.Open Registration of securities of foreign private issuers pursuant to section 12(b) or (g) in XBLR Viewer.Open Registration of securities of foreign private issuers pursuant to section 12(b) or (g) in XBLR file.
6-K	Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act	Apr 29, 2022	Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in HTML.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in DOC file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in PDF file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in XLS file.
6-K	Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act	Apr 29, 2022	Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in HTML.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in DOC file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in PDF file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in XLS file.
6-K	Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act	Apr 28, 2022	Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in HTML.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in DOC file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in PDF file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in XLS file.
6-K/A	Amendment to a previously filed 6-K	Apr 21, 2022	Open Amendment to a previously filed 6-K in HTML.Open Amendment to a previously filed 6-K in DOC file.Open Amendment to a previously filed 6-K in PDF file.Open Amendment to a previously filed 6-K in XLS file.
F-6EF	Filing to become effective immediately upon filing	Mar 21, 2022	Open Filing to become effective immediately upon filing in HTML.Open Filing to become effective immediately upon filing in DOC file.Open Filing to become effective immediately upon filing in PDF file.Open Filing to become effective immediately upon filing in XLS file.
6-K	Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act	Mar 15, 2022	Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in HTML.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in DOC file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in PDF file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in XLS file.
6-K	Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act	Mar 15, 2022	Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in HTML.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in DOC file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in PDF file.Open Report of foreign issuer rules 13a-16 and 15d-16 of the Securities Exchange Act in XLS file.