Armstrong (NYSE: AWI) COO converts 3,532 RSUs, withholds 1,316 shares

Rhea-AI Filing Summary

Armstrong World Industries senior vice president and chief operating officer Mark A. Hershey converted 3,532 Restricted Stock Units into the same number of shares of common stock on February 27, 2026. The derivative securities had a stated price of $0 and convert into common stock on a one-for-one basis.

To cover tax obligations triggered by this vesting, 1,316 common shares were withheld at $173.50 per share. After these transactions, Hershey directly owned 57,193 shares of Armstrong common stock. The RSUs were originally granted on March 1, 2023 and vest on the third anniversary of the grant under the company’s 2022 Equity and Cash Incentive Plan.

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

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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^*

Hershey Mark A

(Last) (First) (Middle)

C/O ARMSTRONG WORLD INDUSTRIES, INC.

2500 COLUMBIA AVENUE

(Street)

LANCASTER PA 17603

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ARMSTRONG WORLD INDUSTRIES INC [ AWI ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP & Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

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

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

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

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	02/27/2026		M		3,532	A	$173.5(1)	58,509	D
Common Stock	02/27/2026		F		1,316(2)	D	$173.5	57,193	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
Restricted Stock Units	(1)	02/27/2026		M			3,532	(3)	(3)	Common Stock	3,532	(4)	0	D

Explanation of Responses:

1. Restricted Stock Units convert into common stock on a one-for-one basis.

2. Represents the number of shares withheld by the Issuer to satisfy the Reporting Person's tax obligations incurred upon the vesting of certain restricted stock units granted to the Reporting Person under the 2022 Equity and Cash Incentive Plan.

3. On March 1, 2023, the Reporting Person was granted 3,532 Restricted Stock Units, which vest on the third anniversary of the grant (contingent upon the Reporting Person's employment with the Issuer on the scheduled vesting date, except as provided for under the Issuer's 2022 Equity and Cash Incentive Plan).

4. Price of Derivative Security is $0.

	/s/ Alan M. Kidd, Attorney-in-fact	03/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did Armstrong (AWI) executive Mark A. Hershey do in this Form 4?

Mark A. Hershey converted 3,532 Restricted Stock Units into common stock and had 1,316 shares withheld for taxes. These transactions reflect equity compensation vesting rather than open-market buying or selling.

How many Armstrong (AWI) shares does Mark A. Hershey own after these transactions?

After the reported transactions, Mark A. Hershey directly owns 57,193 shares of Armstrong World Industries common stock. This figure reflects the RSU conversion and the shares withheld to satisfy tax obligations on the vesting event.

What price was used for the Armstrong (AWI) RSU-related share transactions?

The derivative Restricted Stock Units had a stated price of $0, while the related common stock transactions used a price of $173.50 per share. That price applied to both the RSU conversion and the shares withheld for taxes.

Were the Armstrong (AWI) Form 4 transactions open-market buys or sells?

No. The filing shows a derivative exercise/conversion of Restricted Stock Units and a tax-withholding disposition. These are compensation-related events, not discretionary open-market purchases or sales of Armstrong shares.

When were the reported Armstrong (AWI) Restricted Stock Units granted and how do they vest?

The filing states that 3,532 Restricted Stock Units were granted on March 1, 2023. They vest on the third anniversary of the grant, subject to continued employment, under Armstrong’s 2022 Equity and Cash Incentive Plan.