POWL

SEC source: 0000080420-26-000113 · wk-form4_1790972991.xml · nonDerivative · entry 2

COPE BRETT ALAN · CIK 0001663174 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 515,034

F3 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000115 · wk-form4_1790973035.xml · nonDerivative · entry 2

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,499

F3 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000117 · wk-form4_1790973070.xml · nonDerivative · entry 1

JOHNSON JAMES EDGAR JR · CIK 0002137357 · Vice President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,725

F1 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000119 · wk-form4_1790973103.xml · nonDerivative · entry 2

McKertcher Terry B · CIK 0002025133 · Vice President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,199

F3 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F4 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000121 · wk-form4_1790973140.xml · nonDerivative · entry 2

Ni Ping · CIK 0002024984 · Corp Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,039

F3 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F4 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000125 · wk-form4_1790973339.xml · nonDerivative · entry 2

Birchall John · CIK 0002025235 · Managing Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,502

F3 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F4 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000129 · wk-form4_1790973463.xml · nonDerivative · entry 2

HOGLUND PETER G · CIK 0002028888 · Vice Pres, Global Service

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,770

F3 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000127 · wk-form4_1790973422.xml · nonDerivative · entry 2

TUNINETTI DAVIDE · CIK 0002056270 · CHIEF HUMAN RESOURCE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,711

F4 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000131 · wk-form4_1790973660.xml · nonDerivative · entry 2

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,077

F4 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000123 · wk-form4_1790973227.xml · nonDerivative · entry 2

Eckenrode David L · CIK 0002025273 · Assistant Secretary/Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,264

F3 · price: Represents the average closing stock price from September 1, 2026 - September 30, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F4 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000113 · wk-form4_1790972991.xml · nonDerivative · entry 1

COPE BRETT ALAN · CIK 0001663174 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 507,934

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000115 · wk-form4_1790973035.xml · nonDerivative · entry 1

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,499

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000119 · wk-form4_1790973103.xml · nonDerivative · entry 1

McKertcher Terry B · CIK 0002025133 · Vice President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,599

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000121 · wk-form4_1790973140.xml · nonDerivative · entry 1

Ni Ping · CIK 0002024984 · Corp Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,839

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000125 · wk-form4_1790973339.xml · nonDerivative · entry 1

Birchall John · CIK 0002025235 · Managing Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,102

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000129 · wk-form4_1790973463.xml · nonDerivative · entry 1

HOGLUND PETER G · CIK 0002028888 · Vice Pres, Global Service

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,295

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000127 · wk-form4_1790973422.xml · nonDerivative · entry 1

TUNINETTI DAVIDE · CIK 0002056270 · CHIEF HUMAN RESOURCE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,111

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000131 · wk-form4_1790973660.xml · nonDerivative · entry 1

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,552

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000123 · wk-form4_1790973227.xml · nonDerivative · entry 1

Eckenrode David L · CIK 0002025273 · Assistant Secretary/Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,099

F1 · price: Represents the average of the high and low stock price on 09/30/2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000111 · wk-form4_1786997170.xml · nonDerivative · entry 1

Williams Richard E · CIK 0001668421 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 37,380

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on April 6, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000109 · wk-form4_1786738222.xml · nonDerivative · entry 1

COPE BRETT ALAN · CIK 0001663174 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 512,733

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 26, 2025.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000098 · wk-form4_1783714243.xml · nonDerivative · entry 1

COPE BRETT ALAN · CIK 0001663174 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 517,233

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 26, 2025.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000096 · wk-form4_1783368883.xml · nonDerivative · entry 1

COPE BRETT ALAN · CIK 0001663174 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 521,673

F1 · shares: Board approved, one-time RSU incentive to continue service past retirement eligibility.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000091 · wk-form4_1782937230.xml · nonDerivative · entry 8

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 78,900

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F11 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $287.16-$287.96, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000091 · wk-form4_1782937230.xml · nonDerivative · entry 7

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 79,399

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F10 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $286.14-$287.14, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000091 · wk-form4_1782937230.xml · nonDerivative · entry 6

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 80,634

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F9 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $285.12-$286.12, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000091 · wk-form4_1782937230.xml · nonDerivative · entry 5

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 81,331

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F8 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $284.11-$283.09, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000091 · wk-form4_1782937230.xml · nonDerivative · entry 4

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 81,802

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F7 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $283.08-$283.98, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000091 · wk-form4_1782937230.xml · nonDerivative · entry 3

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 82,207

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F6 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $281.95-$282.88, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000091 · wk-form4_1782937230.xml · nonDerivative · entry 2

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 82,594

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F5 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $280.74-$281.52, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000091 · wk-form4_1782937230.xml · nonDerivative · entry 1

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 83,213

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F2 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $279.73-$280.69, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000089 · wk-form4_1782770897.xml · nonDerivative · entry 1

HOGLUND PETER G · CIK 0002028888 · Vice Pres, Global Service

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,394

F1 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0001219199-26-000005 · primary_doc.xml · nonDerivative · entry 1

POWELL THOMAS W · CIK 0001219199 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 564,736

F1 · kind: The reporting person contributed 33,958 shares of POWL common stock to an exchange fund in exchange for shares of the exchange fund. The POWL common stock was valued at $294.49 per share for the purpose of determining the number of shares of the exchange fund issuable to the reporting person.

F1 · price: The reporting person contributed 33,958 shares of POWL common stock to an exchange fund in exchange for shares of the exchange fund. The POWL common stock was valued at $294.49 per share for the purpose of determining the number of shares of the exchange fund issuable to the reporting person.

SEC source: 0000080420-26-000087 · wk-form4_1781294648.xml · nonDerivative · entry 1

COPE BRETT ALAN · CIK 0001663174 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 485,673

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 26, 2025.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000084 · wk-form4_1780345602.xml · nonDerivative · entry 1

Singh Mohit · CIK 0001897234 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,730

F1 · balance_after: Includes shares that have a time-based vesting provision.

F2 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000076 · wk-form4_1778876587.xml · nonDerivative · entry 1

COPE BRETT ALAN · CIK 0001663174 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 490,113

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 26, 2025.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000074 · wk-form4_1778876500.xml · nonDerivative · entry 3

Williams Richard E · CIK 0001668421 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,630

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 11, 2026.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000074 · wk-form4_1778876500.xml · nonDerivative · entry 2

Williams Richard E · CIK 0001668421 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,770

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 11, 2026.

F5 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $300.00-301.00, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000074 · wk-form4_1778876500.xml · nonDerivative · entry 1

Williams Richard E · CIK 0001668421 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,510

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 11, 2026.

F2 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $298.88-299.00, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

F4 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000072 · wk-form4_1778703249.xml · nonDerivative · entry 7

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,853

F9 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $327.68-$327.71, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000072 · wk-form4_1778703249.xml · nonDerivative · entry 6

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,862

F8 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $326.66-$327.45, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000072 · wk-form4_1778703249.xml · nonDerivative · entry 5

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,928

F7 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $325.44-$326.54, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000072 · wk-form4_1778703249.xml · nonDerivative · entry 4

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,551

F6 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $324.47-$325.10, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000072 · wk-form4_1778703249.xml · nonDerivative · entry 3

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,864

F5 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $323.44-$324.39, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000072 · wk-form4_1778703249.xml · nonDerivative · entry 2

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,040

F4 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $322.43-$323.40, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000072 · wk-form4_1778703249.xml · nonDerivative · entry 1

Mauney William Marshall Jr · CIK 0002025220 · Vice President, R&D

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,426

F1 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $321.39-$322.39, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

F3 · balance_after: The reported number of shares have been adjusted to reflect the impact of the issuer's 3-for-1 forward split of its Common Stock effected on April 2, 2026.

SEC source: 0000080420-26-000058 · wk-form4_1776113226.xml · nonDerivative · entry 1

COPE BRETT ALAN · CIK 0001663174 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 164,851

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 26, 2025.

F2 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $233.81 - $233.98, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F3 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000056 · wk-form4_1775160706.xml · nonDerivative · entry 20

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,800

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F18 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $541.18-$541.56, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000056 · wk-form4_1775160706.xml · nonDerivative · entry 19

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 27,850

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F17 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $539.89-$540.57, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.

SEC source: 0000080420-26-000056 · wk-form4_1775160706.xml · nonDerivative · entry 18

METCALF MICHAEL WILLIAM · CIK 0001760055 · Exec Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,025

F1 · shares: The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2025.

F16 · price: The price reported in Column 4 is an average price; shares were sold in multiple transactions. Reporting range is $538.83-$539.83, inclusive. Reporting person, upon request, will provide Powell Industries, Inc. or the staff of the Securities & Exchange Commission full information regarding the number of shares sold at each price within the ranges set for in this footnote.

F2 · balance_after: Includes shares that have a time-based vesting provision.