FORM 4 [ ] 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 OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Beijing Teamsun Technology Co. Ltd. 2. Issuer Name and Ticker or Trading Symbol GRID DYNAMICS HOLDINGS, INC. [ GDYN ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                    __X__ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)         (First)         (Middle)
ROOM 501, 5/F, NO. 23 BUILDING, 10 E. BLOCK XIBEIWANG EAST RD.
3. Date of Earliest Transaction (MM/DD/YYYY)
7/6/2021
(Street)
HAIDIAN DISTRICT, BEIJING, F4 0000
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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
Common Stock  7/6/2021    S    4800000 (1) D $15.03 (2) 14690295 (3)(4) D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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

Explanation of Responses:
(1)  In connection with the Issuer's public offering, 4,800,000 shares were sold by GDD International Holding Company to the underwriters of the public offering.
(2)  Pursuant to an underwritten public offering of the Issuer's common stock (the "Offering"), on June 30, 2021, the Issuer, the selling stockholders named in the Underwriting Agreement (as defined below) and the underwriters of the Offering (the "Underwriter"), entered into an Underwriting Agreement (the "Underwriting Agreement"). Pursuant to the Underwriting Agreement, GDD International Holding Company ("GDD") sold 4,800,000 shares of common stock of the Issuer to the Underwriters. The per share sale price reported in this Form 4 does not reflect underwriting discounts.
(3)  These securities are directly held by GDD, which is a wholly-owned subsidiary of GDB International Investment Limited, which is a wholly-owned subsidiary of Automated Systems Holdings Limited, which is a subsidiary controlled by Teamsun Technology (HK) Limited, which is a wholly-owned subsidiary of Beijing Teamsun Technology Co., Ltd. (collectively, the "Teamsun Entities").
(4)  Each of the Teamsun Entities may be deemed to beneficially own the securities directly owned by GDD, although each of the Teamsun Entities (other than GDD) disclaims beneficial ownership of such securities, except to the extent of their respective pecuniary interest therein. Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, each of the Reporting Persons (other than GDD) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Beijing Teamsun Technology Co. Ltd.
ROOM 501, 5/F, NO. 23 BUILDING
10 E. BLOCK XIBEIWANG EAST RD.
HAIDIAN DISTRICT, BEIJING, F4 0000

X

Teamsun Technology (HK) Ltd
UNIT 907, 9TH FLOOR, TAI YAU BUILDING
181 JOHNSTON ROAD
WANCHAI, K3 00000

X

Automated Systems Holdings Ltd
15/F., TOPSAIL PLAZA
11 ON SUM STREET
SHATIN, K3 00000

X

GDB International Investment Ltd
15/F., TOPSAIL PLAZA
11 ON SUM STREET
SHATIN, K3 00000

X

GDD International Holding Co
15/F., TOPSAIL PLAZA
11 ON SUM STREET
SHATIN, K3 00000

X


Signatures
BEIJING TEAMSUN TECHNOLOGY CO., LTD., By: /s/ Wang Weihang, Director 7/8/2021
**Signature of Reporting Person Date
TEAMSUN TECHNOLOGY (HK) LIMITED By: /s/ Wang Weihang, Director 7/8/2021
**Signature of Reporting Person Date
AUTOMATED SYSTEMS HOLDINGS LIMITED By: /s/ Wang Yueou, Director 7/8/2021
**Signature of Reporting Person Date
GDB INTERNATIONAL INVESTMENT LIMITED By: /s/ Wang Yueou, Director 7/8/2021
**Signature of Reporting Person Date
GDD INTERNATIONAL HOLDING COMPANY By: Wang Yueou, Director 7/8/2021
**Signature of Reporting Person Date
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