Grid Dynamics COO sells 3,918 shares at $8

GDYN’s chief operating officer reported a small Rule 10b5-1 plan sale of common stock, retaining over half a million shares afterward.

Rhea-AI Filing Summary

GRID DYNAMICS HOLDINGS, INC. (GDYN) reported that its chief operating officer, Yury Gryzlov, sold 3,918 shares of common stock on September 3, 2026 at a price of $8.00 per share. After this sale, he held 503,070 shares directly. The sale was made under a Rule 10b5-1 trading plan adopted on November 13, 2025.

Insider Trade Summary 10b5-1

Net Seller: 3,918 shares

Net Sell 1 txn

Insider Gryzlov Yury

Role CHIEF OPERATING OFFICER

Sold 3,918 shs ($31K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	3,918	$8.00	$31K

Holdings After Transaction: Common Stock — 503,070 shares (Direct)

Footnotes (1)

1. F1. These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 13, 2025.

Key Figures

Shares sold: 3,918 shares Sale price per share: $8.00 per share Transaction value: $31,344 +2 more

5 metrics

Shares sold 3,918 shares Common stock sale on September 3, 2026 by the chief operating officer

Sale price per share $8.00 per share Common stock sale on September 3, 2026

Transaction value $31,344 3,918 shares sold at $8.00 per share

Shares held after transaction 503,070 shares Direct holdings of the chief operating officer after the sale

Rule 10b5-1 plan adoption date November 13, 2025 Plan under which the September 3, 2026 sale was executed

Key Terms

Rule 10b5-1 trading plan, common stock, reporting person

3 terms

Rule 10b5-1 trading plan regulatory

"These shares were sold pursuant to a Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

common stock financial

"These shares were sold pursuant to a Rule 10b5-1 trading plan adopted"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

reporting person regulatory

"trading plan adopted by the Reporting Person on November 13, 2025"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did GDYN report for Yury Gryzlov?

GDYN reported that chief operating officer Yury Gryzlov sold 3,918 shares of common stock on September 3, 2026 at $8.00 per share, leaving him with 503,070 shares held directly after the transaction.

Was the GDYN insider sale made under a Rule 10b5-1 trading plan?

Yes. The filing states that the 3,918-share sale by GDYN chief operating officer Yury Gryzlov was made pursuant to a Rule 10b5-1 trading plan adopted on November 13, 2025.

How many GDYN shares does the chief operating officer hold after this sale?

After the September 3, 2026 sale, GDYN chief operating officer Yury Gryzlov directly holds 503,070 shares of GRID DYNAMICS HOLDINGS, INC. common stock, according to the filing.

What was the total value of the GDYN shares sold by the chief operating officer?

Based on the reported 3,918 shares sold at $8.00 per share on September 3, 2026, the transaction value was approximately $31,344.

Does the Form 4 show any option exercises or derivative transactions for GDYN’s officer?

No. The Form 4 reports only a single sale of 3,918 shares of common stock by GDYN chief operating officer Yury Gryzlov and shows no derivative or option transactions in this filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 09/03/2026 - 05:03 PM EDT Accepted by SEC EDGAR 09/03/2026 - 04:52 PM EDT Learn about SEC filing dates

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 CALIFORNIA 94583

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/03/2026

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

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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	09/03/2026		S		3,918(1)	D	$8	503,070	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.

Remarks:

	/s/Anil Doradla, by power of attorney	09/03/2026
	** 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.
* Form 4: SEC 1474 (03-26)