MKL

SEC source: 0001096343-25-000056 · wk-form4_1744923312.xml · nonDerivative · entry 1

MICHAEL JONATHAN E · CIK 0001192701 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26.437

F1 · kind: Shares acquired under the MKL 2020 Employee Stock Purchase Plan.

SEC source: 0001096343-25-000055 · wk-form4_1744923248.xml · nonDerivative · entry 2

Crowley Andrew G. · CIK 0001926618 · President, Markel Ventures

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,961.3124

F2 · shares: Shares acquired under the non-qualified component of the MKL 2020 Employee Stock Purchase Plan.

SEC source: 0001096343-25-000054 · wk-form4_1744923194.xml · nonDerivative · entry 1

Costanzo Brian J. · CIK 0001873434 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 972.0216

F1 · shares: 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).

SEC source: 0001096343-25-000055 · wk-form4_1744923248.xml · nonDerivative · entry 1

Crowley Andrew G. · CIK 0001926618 · President, Markel Ventures

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,952.7345

F1 · shares: 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).

SEC source: 0001096343-25-000041 · wk-form4_1742330109.xml · nonDerivative · entry 1

MICHAEL JONATHAN E · CIK 0001192701 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15

F1 · kind: Restricted stock granted pursuant to the MKL 2024 Equity Incentive Compensation Plan. Shares will vest, subject to certain conditions, on March 15, 2026.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 7

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,436

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,859.86 to $1,860.75, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 6

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,506

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 26

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,668

F21 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,889.86 to $1,890.70, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 25

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,720

F20 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,888.59 to $1,889.04, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 24

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,764

F19 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,887.57 to $1,888.52, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 23

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,875

F18 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,886.45 to $1,887.36, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 22

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,925

F17 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,885.19 to $1,885.75, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 21

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,000

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 20

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,010

F16 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,882.44 to $1,882.89, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 19

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,053

F15 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,877.78 to $1,878.37, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 18

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,073

F14 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,876.59 to $1,877.52, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 17

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,113

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,875.56 to $1,876.50, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 16

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,185

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,873.74 to $1,874.68, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 15

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,222

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,872.70 to $1,873.47, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 14

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,252

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 13

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,257

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 12

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,267

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,868.00 to $1,868.81, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 11

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,289

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 10

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,299

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,863.65 to $1,864.50, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 9

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,371

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,862.50 to $1,863.06, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 8

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,396

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,860.96 to $1,861.72, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 5

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,524

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,857.46 to $1,858.45, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 4

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,552

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,856.26 to $1,856.96, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 3

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,615

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,854.75 to $1,855.62, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 2

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,678

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,853.58 to $1,853.99, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000031 · wk-form4_1740605463.xml · nonDerivative · entry 1

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,698

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000030 · wk-form4_1740519783.xml · nonDerivative · entry 1

MARKEL ANTHONY F · CIK 0001096933 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,000

F1 · balance_after: The total reported for Grantor Retained Annuity Trusts (as well as the direct holding balance of the reporting person) also reflects the contribution of 9,023 shares from the reporting person to Grantor Retained Annuity Trusts, and the distribution of 6,343 shares from Grantor Retained Annuity Trusts to the reporting person.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 12

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,722

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 11

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,729

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,863.49 to $1,863.90, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 10

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,783

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,862.17 to $1,863.14, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 9

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,880

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,861.14 to $1,862.01, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 8

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,998

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,860.09 to $1,861.04, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 7

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,222

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,859.00 to $1,859.99, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 6

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,360

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,857.87 to $1,858.56, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 5

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,537

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,856.04 to $1,856.64, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 4

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,573

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,854.74 to $1,855.55, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 3

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,672

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,853.44 to $1,854.21, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 2

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,738

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,851.24 to $1851.66, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000032 · wk-form4_1740605516.xml · nonDerivative · entry 1

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,783

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,850.00 to $1,850.30, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000029 · wk-form4_1740519320.xml · nonDerivative · entry 13

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,868

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,864.96 to $1,865.07, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000029 · wk-form4_1740519320.xml · nonDerivative · entry 12

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,888

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,863.50 to $1,864.17, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000029 · wk-form4_1740519320.xml · nonDerivative · entry 11

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,918

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000029 · wk-form4_1740519320.xml · nonDerivative · entry 10

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,928

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,860.77 to $1,861.71, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000029 · wk-form4_1740519320.xml · nonDerivative · entry 9

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 65,018

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,859.67 to $1,860.23, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.

SEC source: 0001096343-25-000029 · wk-form4_1740519320.xml · nonDerivative · entry 8

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 65,078

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,858.49 to $1,859.42, inclusive. The reporting person undertakes to provide to any security holder of MKL or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted November 21, 2024.