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  SECURITIES AND EXCHANGE COMMISSION  
  Washington, D.C. 20549  
     
  SCHEDULE 13D/A  

 

Under the Securities Exchange Act of 1934
(Amendment No. 3)*

 

Cytek Biosciences, Inc.

(Name of Issuer)

 

Common Stock, par value $0.001 per share

(Title of Class of Securities)

 

23285D109

 

(CUSIP Number)

 

RA Capital Management, L.P.

200 Berkeley Street, 18th Floor

Boston, MA 02116

Attn: Peter Kolchinsky

Telephone: 617.778.2500

(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

 

September 15, 2023

(Date of Event Which Requires Filing of this Statement)

 

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ¨

 

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Section 240.13d-7 for other parties to whom copies are to be sent.

 

* 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 disclosures provided in a prior cover page.

 

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

 

 

 

 

 

 

CUSIP No.   23285D109
 
  1.

Names of Reporting Persons.

RA Capital Management, L.P.

 
  2. Check the Appropriate Box if a Member of a Group (See Instructions)
    (a)  ¨
    (b)  ¨
 
  3. SEC Use Only
 
  4. Source of Funds (See Instructions)
AF
 
  5. Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
 
  6. Citizenship or Place of Organization
Delaware
 
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With		 7. Sole Voting Power
0
 
8. Shared Voting Power
6,809,404
 
9. Sole Dispositive Power
0
 
10. Shared Dispositive Power
6,809,404
 
  11. Aggregate Amount Beneficially Owned by Each Reporting Person
6,809,404
 
  12. Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   ¨
 
  13. Percent of Class Represented by Amount in Row (11)
4.99%
 
  14. Type of Reporting Person (See Instructions)
IA, PN
           

 

 

 

 

CUSIP No.   23285D109
 
  1.

Names of Reporting Persons.

Peter Kolchinsky

 
  2. Check the Appropriate Box if a Member of a Group (See Instructions)
    (a)  ¨
    (b)  ¨
 
  3. SEC Use Only
 
  4. Source of Funds (See Instructions)
AF
 
  5. Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     ¨
 
  6. Citizenship or Place of Organization
United States
 
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With		 7. Sole Voting Power
0
 
8. Shared Voting Power
6,809,404
 
9. Sole Dispositive Power
0
 
10. Shared Dispositive Power
6,809,404
 
  11. Aggregate Amount Beneficially Owned by Each Reporting Person
6,809,404
 
  12. Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   ¨
 
  13. Percent of Class Represented by Amount in Row (11)
4.99%
 
  14. Type of Reporting Person (See Instructions)
HC, IN
           

 

 

 

 

CUSIP No.   23285D109
 
  1.

Names of Reporting Persons.

Rajeev Shah

 
  2. Check the Appropriate Box if a Member of a Group (See Instructions)
    (a)  ¨
    (b)  ¨
 
  3. SEC Use Only
 
  4. Source of Funds (See Instructions)
AF
 
  5. Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     ¨
 
  6. Citizenship or Place of Organization
United States
 
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With		 7. Sole Voting Power
0
 
8. Shared Voting Power
6,809,404
 
9. Sole Dispositive Power
0
 
10. Shared Dispositive Power
6,809,404
 
  11. Aggregate Amount Beneficially Owned by Each Reporting Person
6,809,404
 
  12. Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
 
  13. Percent of Class Represented by Amount in Row (11)
4.99%
 
  14. Type of Reporting Person (See Instructions)
HC, IN
           

 

 

 

 

CUSIP No.   23285D109
 
  1.

Names of Reporting Persons.

RA Capital Healthcare Fund, L.P.

 
  2. Check the Appropriate Box if a Member of a Group (See Instructions)
    (a)  ¨
    (b)  ¨
 
  3. SEC Use Only
 
  4. Source of Funds (See Instructions)
WC
 
  5. Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     ¨
 
  6. Citizenship or Place of Organization
Delaware
 
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With		 7. Sole Voting Power
0
 
8. Shared Voting Power
5,802,621
 
9. Sole Dispositive Power
0
 
10. Shared Dispositive Power
5,802,621
 
  11. Aggregate Amount Beneficially Owned by Each Reporting Person
5,802,621
 
  12. Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   ¨
 
  13. Percent of Class Represented by Amount in Row (11)
4.25%
 
  14. Type of Reporting Person (See Instructions)
PN
           

 

 

 

Item 1. Security and Issuer

 

Item 1 of the Statement is hereby amended and supplemented as follows:

 

This Amendment No. 3 (this “Amendment No. 3” or this “13D/A”) amends and supplements the statement on the Schedule 13D originally filed with the Securities and Exchange Commission (the “SEC”) on August 6, 2021, and amended on February 28, 2022, and March 14, 2022 (as amended, the “Statement”), filed by RA Capital Management, L.P., Dr. Kolchinsky, Mr. Shah, and RA Capital Healthcare Fund, L.P. with respect to the common stock, $0.001 par value per share (the “Common Stock”), of Cytek BioSciences, Inc., a Delaware corporation (the “Issuer”). Unless otherwise defined herein, capitalized terms used in this Amendment No. 3 shall have the meanings ascribed to them in the Statement. Unless amended or supplemented below, the information in the Statement remains unchanged.

 

Item 2.Identity and Background

 

Item 2 is hereby amended and restated as follows:

 

(a)This 13D/A is being filed on behalf of RA Capital Management, L.P. (“RA Capital”), Peter Kolchinsky, Rajeev Shah, and RA Capital Healthcare Fund, L.P. (the “Fund”). RA Capital, Dr. Kolchinsky, Mr. Shah and the Fund are collectively referred to herein as the “Reporting Persons.” The agreement among the Reporting Persons to file this 13D/A jointly in accordance with Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended, is attached hereto as Exhibit 1.

 

The Common Stock reported herein includes (1) 5,802,621 shares held directly by the Fund, (2) 301,843 shares held in a separately managed account (the “Account”), and (3) 704,940 shares held directly by RA Capital Nexus Fund II, L.P. (the “Nexus Fund II”).

 

RA Capital Healthcare Fund GP, LLC is the general partner of the Fund and RA Capital Nexus Fund II GP, LLC is the general partner of the Nexus Fund II. The general partner of RA Capital is RA Capital Management GP, LLC, of which Dr. Kolchinsky and Mr. Shah are the controlling persons. RA Capital serves as investment adviser for the Fund, the Account, and the Nexus Fund II and may be deemed a beneficial owner, for purposes of Section 13(d) of the Securities Exchange Act of 1934 (the “Act”), of any securities of the Issuer held by the Fund, the Account, or the Nexus Fund II. The Fund and the Nexus Fund II have delegated to RA Capital the sole power to vote and the sole power to dispose of all securities held in the Fund’s and the Nexus Fund II’s portfolio, including the shares of the Issuer’s Common Stock reported herein.  Because the Fund and the Nexus Fund II have divested themselves of voting and investment power over the reported securities they hold and may not revoke that delegation on less than 61 days’ notice, the Fund and the Nexus Fund II disclaim beneficial ownership of the securities they hold for purposes of Section 13(d) of the Act and therefore disclaim any obligation to report ownership of the reported securities under Section 13(d) of the Act. As managers of RA Capital, Dr. Kolchinsky and Mr. Shah may be deemed beneficial owners, for purposes of Section 13(d) of the Act, of any securities of the Issuer beneficially owned by RA Capital. RA Capital, Dr. Kolchinsky, and Mr. Shah disclaim beneficial ownership of the securities reported in this 13D/A other than for the purpose of determining their obligations under Section 13(d) of the Act, and the filing of this 13D/A shall not be deemed an admission that either RA Capital, Dr. Kolchinsky, or Mr. Shah is the beneficial owner of such securities for any other purpose.

 

(b)The address of the principal business office of each of the Reporting Persons is 200 Berkeley Street, 18th Floor, Boston, MA 02116.

 

(c)The Fund is a private investment vehicle. RA Capital provides investment management services to the Fund, the Account, and the Nexus Fund II. The principal occupation of Dr. Kolchinsky and Mr. Shah is investment management.

 

(d)During the last five years, none of the Reporting Persons has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

 

(e)During the last five years, none of the Reporting Persons has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree of final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

 

(f)See Item 6 of the cover pages.

 

 

 

 

Item 5.Interest in Securities of the Issuer

 

Item 5 of the Statement is hereby amended and restated in its entirety to read as follows:

 

(a)The information set forth in rows 11 and 13 of the cover pages to this 13D/A is incorporated by reference. The percentage set forth in row 13 is based on 136,360,208 outstanding shares of Common Stock, as reported by the Issuer in its Form 10-Q filed with the Securities and Exchange Commission on August 8, 2023.

 

(b)The information set forth in rows 7 through 10 of the cover pages to this 13D/A and Item 2 above is incorporated by reference.

 

(c)The following table lists the Reporting Persons’ transactions in Common Stock that have not previously been reported during the sixty day period prior to the filing of this 13D/A:

 

Transaction Purchaser Date No. Shares Price
Sell The Fund 14-September-2023 112,332 $7.15
Sell The Fund 15-September-2023 776,288 $7.02
Sell The Fund 18-September-2023 87,030 $6.76
Cover The Fund 18-September-2023 3,793,064 $7.00
Cover The Account 18-September-2023 164,776 $7.00
Cover Nexus Fund II 18-September-2023 384,827 $7.00
Sell The Fund 19-September-2023 170,000 $6.47

 

(d)Not Applicable

 

(e)As a result of the transactions described herein, on September 19, 2023, each of the Reporting Persons ceased to be the beneficial owner of more than five percent of the Common Stock. The filing of this Amendment No. 3 represents the final amendment to the Schedule 13D and constitutes an exit filing for each of the Reporting Persons.

 

Item 7. Joint Filing Agreement

 

Item 7 of the Statement is hereby amended and supplemented as follows:

 

Exhibit 1        Joint Filing Agreement  

 

 

 

 

 

SIGNATURES

 

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

 

Dated: September 19, 2023  
   
RA CAPITAL MANAGEMENT, L.P.  
   
By: /s/ Peter Kolchinsky  
Name: Peter Kolchinsky  
Title: Authorized Signatory  
   
PETER KOLCHINSKY  
   
/s/ Peter Kolchinsky  
   
RAJEEV SHAH  
   
/s/ Rajeev Shah  
   
RA CAPITAL HEALTHCARE FUND, L.P.  
   
By: RA Capital Healthcare Fund GP, LLC  
Its: General Partner  
   
By: /s/ Peter Kolchinsky  
Name: Peter Kolchinsky  
Title: Manager  

 

 

 

 

EXHIBIT 1

 

JOINT FILING AGREEMENT

 

This Joint Filing Agreement, dated as of September 19, 2023, is by and among RA Capital Management, L.P., Peter Kolchinsky, Rajeev Shah, and RA Capital Healthcare Fund, L.P. (the foregoing are collectively referred to herein as the “Filers”).

 

Each of the Filers may be required to file with the United States Securities and Exchange Commission a statement on Schedule 13G and/or 13D with respect to Common Stock, $0.001 par value per share of Cytek Biosciences, Inc. beneficially owned by them from time to time.

 

Pursuant to and in accordance with Rule 13(d)(1)(k) promulgated under the Securities Exchange Act of 1934, as amended, the Filers hereby agree to file a single statement on Schedule 13G and/or 13D (and any amendments thereto) on behalf of each of such parties, and hereby further agree to file this Joint Filing Agreement as an exhibit to such statement, as required by such rule.

 

This Joint Filing Agreement may be terminated by any of the Filers upon one week’s prior written notice or such lesser period of notice as the Filers may mutually agree.

 

Executed and delivered as of the date first above written.

 

RA CAPITAL MANAGEMENT, L.P.  
   
By: /s/ Peter Kolchinsky  
Name: Peter Kolchinsky  
Title: Authorized Signatory  
   
PETER KOLCHINSKY  
   
/s/ Peter Kolchinsky  
   
RAJEEV SHAH  
   
/s/ Rajeev Shah  
   
RA CAPITAL HEALTHCARE FUND, L.P.  
   
By: RA Capital Healthcare Fund GP, LLC  
Its: General Partner  
   
By: /s/ Peter Kolchinsky  
Name: Peter Kolchinsky  
Title: Manager