Sec Form 3 Filing - DENG FENG @ Cytek BioSciences, Inc. - 2021-07-22

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person DENG FENG 2. Issuer Name and Ticker or Trading Symbol Cytek BioSciences, Inc. [ CTKB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2855 SAND HILL ROAD 3. Date of Earliest Transaction (MM/DD/YY) 07/22/2021 (Street) MENLO PARK, CA94025 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Series A Preferred Stock ( 1 ) ( 1 ) ( 1 ) Common Stock 147,933 I See footnote ( 2 ) Series C Preferred Stock ( 1 ) ( 1 ) ( 1 ) Common Stock 4,168,777 I See footnote ( 2 ) Series D Preferred Stock ( 1 ) ( 1 ) ( 1 ) Common Stock 443,800 I See footnote ( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other DENG FENG 2855 SAND HILL ROAD MENLO PARK, CA94025 X Signatures /s/ Valerie Barnett, Attorney-in-Fact for Feng Deng 07/22/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each share of Preferred Stock automatically converts on a one-for-one basis into Common Stock upon the closing of the Issuer's initial public offering (the "IPO"), for no additional consideration. The shares of Preferred Stock have no expiration date. ( 2 )Shares held directly by Northern Light Venture Capital V, Ltd. ("NLVC V"). Fund V serves as the nominee for each of Northern Light Venture Fund V, L.P., Northern Light Strategic Fund V, L.P. and Northern Light Partners Fund V, L.P (together, the "NLVC V Funds"). Northern Light Partners V, L.P., a Cayman Islands exempted limited liability partnership, is the general partner of the NLVC V Funds. NLVC V is the general partner of Northern Light Partners V, L.P. Feng Deng is the controlling shareholder of NLVC V and may be deemed to have voting and dispositive power with respect to the shares held by NLVC V.

Remarks: Exhibit 24 - Power of Attorney

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.