CooTek appoints Lili Guo as Ye Yuan exits board

Lili Guo has served as CooTek’s Head of Human Resources since July 2023 and previously held HR roles at Alibaba Group and New Oriental Education & Technology Group.

Available on EDGAR 11/06/2026 - 08:10 AM EST Accepted by SEC EDGAR 11/06/2026 - 08:10 AM EST Learn about SEC filing dates

Rhea-AI Filing Summary

CooTek (Cayman) Inc. appointed Lili Guo to its board and reported that director Ye Yuan resigned, both effective November 6, 2026. Ye Yuan resigned for personal reasons. Following the changes, the board comprises three directors.

Guo has served as CooTek’s Head of Human Resources since July 2023 and previously was its Organizational Development Expert from September 2020 to July 2023. Before joining CooTek, she held Senior Human Resources Manager positions at New Oriental Education & Technology Group and Alibaba Group. She was Head of Human Resources at Arvato Services Bertelsmann from January 2011 to November 2018 and began her career as a consultant at Metizo Consulting Ltd.

Key Figures

Board size: 3 directors Director appointment effective date: November 6, 2026 Director resignation effective date: November 6, 2026 +1 more

4 metrics

Board size 3 directors Following Ye Yuan’s resignation and Lili Guo’s appointment

Director appointment effective date November 6, 2026 Lili Guo

Director resignation effective date November 6, 2026 Ye Yuan

Head of Human Resources service Since July 2023 Lili Guo at CooTek

Key Terms

foreign private issuer, Form 20-F, Form 40-F

3 terms

foreign private issuer regulatory

"REPORT OF FOREIGN PRIVATE ISSUER"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

Form 20-F regulatory

"annual reports under cover of Form 20-F"

Form 20-F is the standardized annual disclosure that non-U.S. companies must file with the U.S. securities regulator when their shares are traded in the U.S.; it contains audited financial statements, a plain-language description of the business, management discussion, governance details and key risk factors. It matters to investors because it provides a consistent, comparable company “report card” and rulebook, helping buyers assess financial health, governance and risks before investing.

Form 40-F regulatory

"annual reports under cover of Form 40-F"

A Form 40-F is a standardized annual filing used by certain Canadian companies that trade in U.S. markets to give U.S. regulators and investors the same core financial statements and key disclosures they file in Canada. Think of it as a translated, formally packaged annual report that lets investors in a different marketplace compare a company’s results, governance and risks more easily, which reduces uncertainty and helps investment decisions.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

Who joined CTKYY’s board, and when?

Lili Guo joined the board as a director effective November 6, 2026. Ye Yuan resigned from the board effective that day for personal reasons, leaving the board with three directors.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 6-K: How Foreign Companies Report to the SEC →

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 UNDER
THE SECURITIES EXCHANGE ACT OF 1934

For the month of November 2026

Commission File Number: 001-38665

CooTEK (CAYMAN) INC.

7F, T3, Lane 360, Xinlong Road

Minhang District, Shanghai, 201101

People’s Republic of China

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x Form 40-F ¨

Change of Board

CooTek (Cayman) Inc. (the “Company”) today announced that Mr. Ye Yuan has resigned from the board of directors of the Company (the “Board”) due to personal reasons, effective November 6, 2026, and that Ms. Lili Guo has been appointed as a director of the Company, effective November 6, 2026. Following Mr. Ye Yuan’s resignation and Ms. Lili Guo’s appointment, the Board comprises three directors in total.

Ms. Lili Guo has served as the Company’s Head of Human Resources since July 2023, and previously served as the Company’s Organizational Development Expert from September 2020 to July 2023. Prior to joining the Company, Ms. Guo held Senior Human Resources Manager positions at New Oriental Education & Technology Group from September 2019 to September 2020, and at Alibaba Group from November 2018 to October 2019. From January 2011 to November 2018, she served as Head of Human Resources at Arvato Services Bertelsmann. Ms. Guo began her professional career as a Consultant at Metizo Consulting Ltd. from July 2008 to December 2010. Ms. Guo received her bachelor’s degree in English Language and Literature from Beijing Language and Culture University in 2008 and her master’s degree in Managerial Psychology from The University of Hong Kong in 2023.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	COOTEK (CAYMAN) INC.
	By:	/s/ Karl Kan Zhang
		Name:	Karl Kan Zhang
		Title:	Chairman of the Board of Directors, Chief Technology Officer and Acting Chief Financial Officer

Date : November 6, 2026