Powell Industries (POWL) VP trims stake with 2,500-share open-market sale

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Powell Industries Vice President of R&D William Marshall Mauney Jr. reported open-market sales of a total of 2,500 shares of common stock on May 11, 2026 at prices around the low $320s per share. After these transactions, he directly holds 10,853 common shares, including shares with time-based vesting provisions and adjusted for the company’s 3-for-1 forward stock split effective on April 2, 2026.

Insider Trade Summary

Net Seller: 2,500 shares ($809,218)

Net Sell 7 txns

Insider Mauney William Marshall Jr

Role Vice President, R&D

Sold 2,500 shs ($809K)

Type	Security	Shares	Price	Value
Sale	Common Stock	927	$321.86	$298K
Sale	Common Stock	386	$322.70	$125K
Sale	Common Stock	176	$323.82	$57K
Sale	Common Stock	313	$324.87	$102K
Sale	Common Stock	623	$325.97	$203K
Sale	Common Stock	66	$327.06	$22K
Sale	Common Stock	9	$327.69	$3K

Holdings After Transaction: Common Stock — 12,426 shares (Direct, null)

Footnotes (1)

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. Includes shares that have a time-based vesting provision. 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. 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. 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. 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. 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. 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. 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.

Key Figures

Total shares sold: 2,500 shares Post-transaction holdings: 10,853 shares Sale price example: $321.86 per share +3 more

6 metrics

Total shares sold 2,500 shares Net open-market sales on May 11, 2026

Post-transaction holdings 10,853 shares Common stock directly held after May 11, 2026 trades

Sale price example $321.86 per share One of several reported average sale prices on May 11, 2026

Highest reported sale price $327.69 per share Average price for a 9-share sale of common stock

Largest single trade size 927 shares Open-market sale at $321.86 per share

Stock split ratio 3-for-1 forward split Effective April 2, 2026 for Powell Industries common stock

Key Terms

open-market sale, 3-for-1 forward split, time-based vesting provision, average price, +1 more

5 terms

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

3-for-1 forward split financial

"reflect the impact of the issuer's 3-for-1 forward split of its Common Stock"

time-based vesting provision financial

"Includes shares that have a time-based vesting provision."

average price financial

"The price reported in Column 4 is an average price; shares were sold in multiple transactions."

reporting person regulatory

"Reporting person, upon request, will provide Powell Industries, Inc. or the staff"

Form 4 Insider Transactions: What Each Field Means →

05/13/2026 - 04:14 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mauney William Marshall Jr

(Last)

(First)

(Middle)

8550 MOSLEY ROAD

(Street)

HOUSTON

TEXAS

77075

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
POWELL INDUSTRIES INC [ POWL ]

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

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Vice President, R&D

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/11/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/11/2026	05/11/2026	S		927	D	$321.86⁽¹⁾	12,426⁽²⁾⁽³⁾	D
Common Stock	05/11/2026	05/11/2026	S		386	D	$322.7⁽⁴⁾	12,040⁽²⁾⁽³⁾	D
Common Stock	05/11/2026	05/11/2026	S		176	D	$323.82⁽⁵⁾	11,864⁽²⁾⁽³⁾	D
Common Stock	05/11/2026	05/11/2026	S		313	D	$324.87⁽⁶⁾	11,551⁽²⁾⁽³⁾	D
Common Stock	05/11/2026	05/11/2026	S		623	D	$325.97⁽⁷⁾	10,928⁽²⁾⁽³⁾	D
Common Stock	05/11/2026	05/11/2026	S		66	D	$327.06⁽⁸⁾	10,862⁽²⁾⁽³⁾	D
Common Stock	05/11/2026	05/11/2026	S		9	D	$327.69⁽⁹⁾	10,853⁽²⁾⁽³⁾	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. 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.

2. Includes shares that have a time-based vesting provision.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

Remarks:

	Michael W. Metcalf, Power of Attorney for William Marshall Mauney, Jr.	05/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Powell Industries (POWL) report for William Marshall Mauney Jr.?

Powell Industries reported that Vice President of R&D William Marshall Mauney Jr. sold 2,500 shares of common stock in open-market transactions on May 11, 2026. These trades were executed at prices in the low $320s per share.

How many Powell Industries (POWL) shares does Mauney hold after the May 11, 2026 sales?

Following the reported sales, Mauney directly holds 10,853 shares of Powell Industries common stock. This figure includes shares subject to time-based vesting and reflects adjustments from the company’s 3-for-1 forward stock split effective April 2, 2026.

At what prices did Mauney’s May 11, 2026 Powell Industries (POWL) trades occur?

The Form 4 shows sales at reported prices such as $321.86, $322.70, $323.82, $324.87, $325.97, $327.06 and $327.69 per share. Footnotes note these are average prices for multiple trades within specified intraday price ranges.

What is the total number of Powell Industries (POWL) shares Mauney sold on May 11, 2026?

Across seven open-market transactions on May 11, 2026, Mauney sold a total of 2,500 shares of Powell Industries common stock. Individual trades ranged from 9 to 927 shares, each reported with its own average sale price.

Does the Powell Industries (POWL) Form 4 mention stock splits affecting Mauney’s holdings?

Yes. A footnote explains that Mauney’s reported share numbers are adjusted for Powell Industries’ 3-for-1 forward split of its common stock, which was effected on April 2, 2026. This adjustment impacts both prior holdings and post-transaction totals.

Are any of Mauney’s Powell Industries (POWL) shares subject to vesting conditions?

The filing notes that Mauney’s reported holdings include shares with a time-based vesting provision. This means some shares will become fully owned over time based on continued service, rather than being immediately unrestricted.