CTKB Cytek Biosciences Inc

The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

 Names of Reporting Persons

 Wenbin Jiang

 Check the Appropriate Box if a Member of a Group (see instructions)

 (a) ☐  (b) ☐

 SEC USE ONLY

 Citizenship or Place of Organization

 United States

Number of

Shares  Beneficially 

Owned by

Each

Reporting

Person

With:

 Sole Voting Power

 5,702,130 shares (See Item 4 herein)

 Shared Voting Power

 0

 Sole Dispositive Power

 5,702,130 shares (See Item 4 herein)

 Shared Dispositive Power

 0

 Aggregate Amount Beneficially Owned by Each Reporting Person

 5,702,130 shares (See Item 4 herein)

 Check if the Aggregate Amount in Row (9) Excludes Certain Shares (see instructions)

 ☐

 Percent of Class Represented by Amount in Row 9

 4.3%⁽¹⁾

 Type of Reporting Person (see instructions)

 IN

The percentage is calculated based on 130,714,906 shares of Common Stock outstanding as of December 31, 2023.

Name of Issuer:

Address of Issuer’s Principal Executive Offices:

Name of Person Filing:

Address of Principal Business Office or, if none, Residence:

Citizenship:

Title of Class of Securities:

CUSIP Number:

If this statement is filed pursuant to §§240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a:

Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o);

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);

Insurance company as defined in section 3(a)19) of the Act (15 U.S.C. 78c);

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);

An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

A non-U.S. institution in accordance with §240.13d–1(b)(1)(ii)(J);

Group, in accordance with §240.13d–1(b)(1)(ii)(K).

Ownership

Amount Beneficially Owned: Includes 5,288,095 shares of Common Stock, 6,758 shares of Common Stock issuable upon the vesting of Restricted Stock Units, and 407,277 shares of Common Stock issuable pursuant to stock options exercisable within 60 days of December 31, 2023.

Percent of Class: 4.3%

Number of shares as to which the person has:

Sole power to vote or to direct the vote: 5,702,130

Shared power to vote or to direct the vote: 0

Sole power to dispose or to direct the disposition of: 5,702,130

Shared power to dispose or to direct the disposition of: 0

Ownership of Five Percent or Less of a Class

Ownership of More than Five Percent on Behalf of Another Person

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.

Identification and Classification of Members of the Group

Notice of Dissolution of a Group

Certification