MKL

SEC source: 0001096343-23-000192 · wk-form4_1694205288.xml · nonDerivative · entry 5

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,946

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000192 · wk-form4_1694205288.xml · nonDerivative · entry 4

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,956

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,461.42 to $1,462.31, 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 May 31, 2023.

SEC source: 0001096343-23-000192 · wk-form4_1694205288.xml · nonDerivative · entry 3

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,986

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000192 · wk-form4_1694205288.xml · nonDerivative · entry 2

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,993

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,458.57 to $1,459.31, 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 May 31, 2023.

SEC source: 0001096343-23-000192 · wk-form4_1694205288.xml · nonDerivative · entry 1

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,006

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000193 · wk-form4_1694205533.xml · nonDerivative · entry 2

Cunningham Lawrence A · CIK 0001699875 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 483.3142

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 22

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,016

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 21

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,026

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 20

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,036

F15 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,489.51 to $1,489.90, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 19

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,046

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 18

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,056

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 17

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,057

F14 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,478.50 to $1,478.89, 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.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 16

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,077

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,477.03 to $1,477.32, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 15

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,095

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,476.00 to $1,476.98, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 14

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,104

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 13

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,106

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,474.16 to $1,474.36, 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.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 12

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,113

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,473.11 to $1,473.71, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 11

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,126

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,472.01 to $1,472.61, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 10

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,146

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,471.33 to $1,471.54, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 9

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,159

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 8

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,166

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,469.85 to $1,469.98, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 7

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,196

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,468.04 to $1,468.75, 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.

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 6

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,226

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,467.00 to $1,467.46, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 5

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,236

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 4

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,246

F2 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 3

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,252

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,463.00 to $1,463.87, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 2

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,317

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,462.15 to $1,462.85, 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 May 31, 2023.

SEC source: 0001096343-23-000191 · wk-form4_1694032405.xml · nonDerivative · entry 1

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,345

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,461.14 to $1,461.80, 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 May 31, 2023.

SEC source: 0001096343-23-000193 · wk-form4_1694205533.xml · nonDerivative · entry 1

Cunningham Lawrence A · CIK 0001699875 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 473.3142

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 10

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,366

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,485.03 to $1,485.91, 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 May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 9

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,417

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,484.09 to $1,484.92, 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 May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 8

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,460

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,483.52 to $1,483.97, 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 May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 7

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,475

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,482.00 to $1,482.97, 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 May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 6

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,572

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,481.08 to $1,481.99, 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 May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 5

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,670

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,480.36 to $1,480.64, 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.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 4

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,682

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,479.56 to $1,479.92, 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 May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 3

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,692

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,478.93 to $1,478.99, 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 May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 2

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,706

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000190 · wk-form4_1693600240.xml · nonDerivative · entry 1

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,709

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000185 · wk-form4_1693427600.xml · nonDerivative · entry 1

Cunningham Lawrence A · CIK 0001699875 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 463.3142

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 19

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,716

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 18

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,719

F15 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,479.11 to $1,479.86, 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 May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 17

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,747

F14 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,478.13 to $1,478.90, 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.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 16

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,775

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,477.00 to $1,477.49, 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 May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 15

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,815

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 14

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,818

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,475.00 to $1,475.08, 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 May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 13

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,848

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,474.00 to $1,474.90, 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.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 12

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,872

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,473.13 to $1,473.81, 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 May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 11

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,896

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,472.50 to $1,472.90, 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.

F1 · ownership.direct: The reported sale was effected pursuant to a Rule 10b5-1 trading plan adopted May 31, 2023.

SEC source: 0001096343-23-000183 · wk-form4_1693427499.xml · nonDerivative · entry 10

MARKEL STEVEN A · CIK 0001184575 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,916

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1,471.35 to $1,471.72, 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 May 31, 2023.