Grid Dynamics (GDYN) COO sells 21,266 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

GRID DYNAMICS HOLDINGS, INC. Chief Operating Officer Yury Gryzlov sold 21,266 shares of common stock on March 10, 2026 in an open-market transaction at a weighted average price of $6.22 per share. The sale was made under a pre-arranged Rule 10b5-1 trading plan adopted on November 13, 2025, indicating it was scheduled in advance. After this sale, Gryzlov directly holds 523,413 shares of the company’s common stock.

Insider Trade Summary 10b5-1

Net Seller: 21,266 shares ($132,275)

Net Sell 1 txn

Insider Gryzlov Yury

Role CHIEF OPERATING OFFICER

Sold 21,266 shs ($132K)

Type	Security	Shares	Price	Value
Sale	Common Stock	21,266	$6.22	$132K

Holdings After Transaction: Common Stock — 523,413 shares (Direct)

Footnotes (1)

1. These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 13, 2025. This transaction was executed in multiple trades at prices ranging from $6.07 to $6.45. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate sale price.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Gryzlov Yury

(Last) (First) (Middle)

C/O GRID DYNAMICS HOLDINGS, INC.

6101 BOLLINGER CANYON ROAD, SUITE 465

(Street)

SAN RAMON CA 94583

(City) (State) (Zip)

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		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF OPERATING OFFICER

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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
Common Stock	03/10/2026		S		21,266(1)	D	$6.22(2)	523,413	D

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		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: 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. These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 13, 2025.

2. This transaction was executed in multiple trades at prices ranging from $6.07 to $6.45. The price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate sale price.

	/s/ Anil Doradla, by power of attorney	03/12/2026
	** Signature of Reporting Person	Date
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.

FAQ

What insider transaction did GDYN COO Yury Gryzlov report?

GDYN Chief Operating Officer Yury Gryzlov reported an open-market sale of 21,266 shares of common stock. The trade occurred on March 10, 2026 at a weighted average price of $6.22 per share, according to the Form 4 filing.

At what prices did the GDYN COO sell his shares?

The GDYN COO’s shares were sold in multiple trades at prices ranging from $6.07 to $6.45 per share. The Form 4 reports a weighted average sale price of $6.22 per share for the 21,266 shares of common stock sold.

How many GRID DYNAMICS (GDYN) shares does the COO hold after the sale?

After the reported sale, GDYN Chief Operating Officer Yury Gryzlov directly holds 523,413 shares of the company’s common stock. This figure reflects his position following the 21,266-share open-market transaction disclosed in the Form 4 filing.

Was the GDYN COO’s stock sale made under a Rule 10b5-1 plan?

Yes. The Form 4 states the GDYN COO’s 21,266-share sale was executed under a Rule 10b5-1 trading plan. That plan was adopted on November 13, 2025, indicating the transaction was pre-scheduled rather than a spontaneous trade.

What type of transaction did GDYN report for its COO on Form 4?

The Form 4 reports an open-market sale of GDYN common stock by Chief Operating Officer Yury Gryzlov. It classifies the transaction with code “S,” meaning a sale in the open market or in a private transaction of 21,266 shares.

Can investors get detailed pricing for the GDYN COO’s share sales?

Yes. The filing notes the sale was executed in multiple trades between $6.07 and $6.45 per share. It states the reporting person will provide full trade-by-trade price and share details upon request to regulators, the issuer, or its security holders.