Powell Industries (NASDAQ: POWL) director sale under 10b5-1 plan

Rhea-AI Filing Summary

Powell Industries Inc. director Richard E. Williams reported selling 2,250 shares of Common Stock on August 14, 2026 at $203.05 per share in an open-market or private transaction. The sale was effected under a Rule 10b5-1 trading plan adopted on April 6, 2026. Following this transaction, he directly holds 37,380 shares, which include shares subject to a time-based vesting provision.

Insider Trade Summary 10b5-1

Net Seller: 2,250 shares

Net Sell 1 txn

Insider Williams Richard E

Role Director

Sold 2,250 shs ($457K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	2,250	$203.05	$457K

Holdings After Transaction: Common Stock — 37,380 shares (Direct)

Footnotes (2)

1. F1. 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.
2. F2. Includes shares that have a time-based vesting provision.

Key Figures

Shares sold: 2,250 shares Sale price per share: $203.05 per share Shares held after transaction: 37,380 shares +2 more

5 metrics

Shares sold 2,250 shares Non-derivative sale of Common Stock on August 14, 2026

Sale price per share $203.05 per share Price for the 2,250 shares of Common Stock sold

Shares held after transaction 37,380 shares Direct Common Stock holdings following the reported sale

Number of sale transactions 1 transaction Single reported non-derivative sale in this Form 4

10b5-1 plan adoption date April 6, 2026 Date the Rule 10b5-1 trading plan governing this sale was adopted

Key Terms

Rule 10b5-1 trading plan, time-based vesting provision, non-derivative

3 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

time-based vesting provision financial

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

non-derivative financial

"transaction_type: non-derivative for the Common Stock sale"

FAQ

What did POWL director Richard E. Williams report in this Form 4?

He reported a sale of 2,250 shares of Powell Industries Inc. Common Stock on August 14, 2026 at $203.05 per share. After the transaction, he directly holds 37,380 shares, including shares with a time-based vesting provision.

How many POWL shares did Richard E. Williams sell and at what price?

He sold 2,250 shares of Powell Industries Inc. Common Stock at $203.05 per share. The transaction is reported as a sale in an open-market or private transaction and is coded as a disposition of non-derivative securities.

How many POWL shares does Richard E. Williams hold after this transaction?

Following the sale, he directly holds 37,380 shares of Powell Industries Inc. Common Stock. This amount includes shares with a time-based vesting provision, meaning some shares are subject to continued service or time conditions.

Was the POWL stock sale by Richard E. Williams under a Rule 10b5-1 plan?

Yes. The sale was effected under a Rule 10b5-1 trading plan adopted by Richard E. Williams on April 6, 2026. Such plans pre-schedule trades, providing a structured framework for insider transactions over time.

What type of security did Richard E. Williams trade in this POWL Form 4?

He traded Common Stock of Powell Industries Inc. in a non-derivative transaction. The Form 4 shows no derivative securities transactions and indicates that his ownership of these shares is direct rather than indirect through another entity.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/17/2026 - 04:06 PM Accepted by SEC EDGAR 08/17/2026 - 04:06 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).

X

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^*

Williams Richard E

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

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	08/14/2026	08/14/2026	S		2,250(1)	D	$203.05	37,380(2)	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. 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.

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

Remarks:

	Michael W. Metcalf, Power of Attorney for Richard E. Williams	08/17/2026
	** 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)