Markel Group CFO acquires 2 shares under employee plan

The ESPP acquisition was exempt under Exchange Act Rule 16b-3(c), and it came from the plan’s qualified component.

Rhea-AI Filing Summary

Markel Group Inc. Chief Financial Officer Brian J. Costanzo acquired 2 common shares on September 30, 2026, under the qualified component of the MKL 2020 Employee Stock Purchase Plan, at $1,455.58 per share. His reported direct holdings after the transaction were 1,634 shares.

A separate holding entry lists 232 shares indirectly through the 401(k) Plan as of September 30, 2026. A footnote reports that he acquired 2 shares under that plan between June 30, 2026, and September 30, 2026.

Insider Trade Summary

Other: 2.061 shares

Other 2 txns

Insider Costanzo Brian J.

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Other	Common Stock F1	2.061	$1,455.58	$3K
holding	Common Stock F2	--	--	--

Holdings After Transaction: Common Stock — 1,634.3004 shares (Direct); Common Stock — 231.821 shares (Indirect, 401(k) Plan)

Footnotes (2)

1. F1. Shares acquired under the qualified component of the MKL 2020 Employee Stock Purchase Plan in a transaction exempt under Exchange Act Rule 16b-3(c).
2. F2. Between June 30, 2026 and September 30, 2026, the reporting person acquired 2.229 shares under the MKL 401(k) plan. The information reported herein is based on the plan balance as of September 30, 2026.

Key Figures

Common shares acquired: 2 shares Price per share: $1,455.58 Direct common shares following transaction: 1,634 shares +2 more

5 metrics

Common shares acquired 2 shares September 30, 2026, under the MKL 2020 Employee Stock Purchase Plan

Price per share $1,455.58 Common stock acquired September 30, 2026

Direct common shares following transaction 1,634 shares Reported after the September 30, 2026 transaction

Indirect common shares through 401(k) Plan 232 shares Plan balance as of September 30, 2026

Common shares acquired under 401(k) Plan 2 shares Between June 30, 2026, and September 30, 2026

Key Terms

qualified component, Employee Stock Purchase Plan, Rule 16b-3(c), 401(k) plan

4 terms

qualified component financial

"acquired under the qualified component of the MKL 2020 Employee Stock Purchase Plan"

Employee Stock Purchase Plan financial

"MKL 2020 Employee Stock Purchase Plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Rule 16b-3(c) regulatory

"transaction exempt under Exchange Act Rule 16b-3(c)"

An SEC rule that lets corporate insiders avoid automatic "short‑swing" profit recovery when they buy or sell their company’s stock under a pre‑approved, written plan that meets specific conditions. For investors, it matters because it clarifies when insider trades are treated as routine, reducing legal uncertainty and helping distinguish trades made for ordinary compensation or pre‑planned reasons from those that might signal opportunistic or timely insider advantage.

401(k) plan financial

"acquired 2.229 shares under the MKL 401(k) plan"

A 401(k) plan is a workplace retirement account that lets employees set aside part of their pay into a tax-advantaged savings pot, often with employers adding matching contributions — like a workplace piggy bank for future income. It matters to investors because the amount people save and how employers fund these plans influence consumer spending, corporate payroll costs and the flow of money into financial markets, which can affect stock prices and company valuations.

FAQ

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

How many MKL shares did CFO Brian J. Costanzo acquire?

Brian J. Costanzo acquired 2 common shares on September 30, 2026, at $1,455.58 per share under the qualified component of the MKL 2020 Employee Stock Purchase Plan. His reported direct holdings after the transaction were 1,634 shares.

What were Brian J. Costanzo’s reported MKL holdings after the transaction?

As of September 30, 2026, Costanzo’s reported holdings were 1,634 common shares directly and 232 shares indirectly through the 401(k) Plan. A footnote reports that he acquired 2 shares under that plan between June 30, 2026, and September 30, 2026.

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

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Available on EDGAR 10/16/2026 - 04:50 PM EDT Accepted by SEC EDGAR 10/16/2026 - 04:50 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).

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^*

Costanzo Brian J.

(Last) (First) (Middle)

C/O MARKEL GROUP INC.

4521 HIGHWOODS PARKWAY

(Street)

GLEN ALLEN VIRGINIA 23060

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MARKEL GROUP INC. [ MKL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2026

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	09/30/2026		J	V	2.061(1)	A	$1,455.58	1,634.3004	D
Common Stock								231.821	I	401(k) Plan(2)

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. Shares acquired under the qualified component of the MKL 2020 Employee Stock Purchase Plan in a transaction exempt under Exchange Act Rule 16b-3(c).

2. Between June 30, 2026 and September 30, 2026, the reporting person acquired 2.229 shares under the MKL 401(k) plan. The information reported herein is based on the plan balance as of September 30, 2026.

Remarks:

	/s/ Karen O. Earls, Attorney-in-fact for Brian J. Costanzo	10/16/2026
	** 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)