Powell Industries VP Mauney sells 301 common shares

The reported stock-price figures are averages tied to different periods: one trading day and one month.

Rhea-AI Filing Summary

At Powell Industries Inc., Vice President, R&D William Marshall Mauney Jr. reported a sale of 301 common shares on September 30, 2026, and a grant/award acquisition of 525 shares on October 1, 2026. The sale’s reported $187.67 per-share figure represents the average of the day’s high and low stock prices; the award’s $181.67 per-share figure represents the average closing stock price from September 1 through September 30. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Seller: 301 shares

Net Sell 2 txns

Insider Mauney William Marshall Jr

Role Vice President, R&D

Sold 301 shs ($56K)

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F4, F2, F3	525	$181.67	$95K
Sale	Common Stock F1, F2, F3	301	$187.67	$56K

Holdings After Transaction: Common Stock — 11,077 shares (Direct)

Footnotes (4)

1. F1. Represents the average of the high and low stock price on 09/30/2026.
2. F2. Includes shares that have a time-based vesting provision.
3. F3. 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. F4. Represents the average closing stock price from September 1, 2026 - September 30, 2026.

Key Figures

Shares sold: 301 shares Average of high and low stock price: $187.67 per share Grant/award acquisition: 525 shares +1 more

4 metrics

Shares sold 301 shares September 30, 2026; common stock

Average of high and low stock price $187.67 per share September 30, 2026

Grant/award acquisition 525 shares October 1, 2026; common stock

Average closing stock price $181.67 per share September 1 through September 30

Key Terms

time-based vesting provision, 3-for-1 forward split, average closing stock price, average of the high and low stock price

4 terms

time-based vesting provision financial

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

3-for-1 forward split financial

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

average closing stock price financial

"Represents the average closing stock price from September 1 - September 30."

average of the high and low stock price financial

"Represents the average of the high and low stock price on 09/30/2026."

FAQ

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

How many POWL shares did William Marshall Mauney Jr. sell?

He reported selling 301 common shares on September 30, 2026. The reported $187.67 per-share figure represents the average of the day’s high and low stock prices, and no Rule 10b5-1 plan is reported.

How many POWL shares did William Marshall Mauney Jr. receive as an award?

He reported a grant/award acquisition of 525 common shares on October 1, 2026. The reported $181.67 per-share figure represents the average closing stock price from September 1 through September 30.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 10/02/2026 - 04:41 PM Accepted by SEC EDGAR 10/02/2026 - 04:41 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

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

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

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

1. Name and Address of Reporting Person^*

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)
09/30/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/30/2026	10/01/2026	S		301	D	$187.67(1)	10,552(2)(3)	D
Common Stock	10/01/2026	10/01/2026	A		525	A	$181.67(4)	11,077(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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the average of the high and low stock price on 09/30/2026.

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

Remarks:

	Michael W. Metcalf, Power of Attorney for William Marshall Mauney, Jr.	10/02/2026
	** 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)