[Form 4] ARMSTRONG WORLD INDUSTRIES INC Insider Trading Activity

Rhea-AI Filing Summary

Armstrong World Industries (AWI) reported a routine insider equity grant: a director received 435 restricted stock units on 10/29/2025 at a stated price of $0 per unit. Following the transaction, the director beneficially owned 435 units, held directly.

The award was made under the company’s 2016 Directors Stock Unit Plan and vests on the earlier of the next annual shareholders meeting, death or total and permanent disability, or a Change in Control. The grant date fair value was determined using the $191.99 closing price on October 29, 2025.

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

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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^*

HOLLERAN KEVIN

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
10/29/2025

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(1)	10/29/2025		A		435(2)	A	$0	435(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. Restricted stock units granted under the 2016 Directors Stock Unit Plan (the "2016 Plan"), and as part of the Issuer's nonemployee Director Compensation Program. The units vest (contingent upon the Director's continued service as of such date) on the earlier of (i) the date of the next annual shareholders meeting following the grant; (ii) the death or total and permanent disability of the Director; or (iii) the date of any Change in Control (as defined in the 2016 Plan). Vested units will be acquirable by the Director, at the election of the Director: (i) at the vesting of the units on the date of the next annual shareholders meeting following the grant or (ii) at the time of the Director's termination of service.

2. Represents a prorated annual grant of restricted stock units as the equity portion of the Director's retainer for Board service under the Issuer's nonemployee Director Compensation Program. The grant date fair value of the units is calculated under the Financial Accounting Standards Board's Accounting Standards Codification Topic 718 using the closing stock price of the Issuer's common shares on October 29, 2025, which price was $191.99.

3. Includes vested and unvested units as well as units not yet acquirable by the Director. Under the terms of the 2016 Plan, vested units under the 2016 Plan are not acquirable by the Director until, at the election of the Director: (i) the vesting of the units on the date of the next annual shareholders meeting following the grant or (ii) the time of the Director's termination of service.

	/s/ Alan M. Kidd, Attorney-in-fact	10/30/2025
	** 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.

FAQ

What did AWI disclose in this Form 4?

A director received 435 restricted stock units on 10/29/2025, with direct beneficial ownership of 435 units after the transaction.

What are the vesting conditions for the AWI director’s RSUs?

Units vest on the earlier of the next annual shareholders meeting, the director’s death or total and permanent disability, or a Change in Control.

What pricing reference was used for the AWI RSU grant?

Grant date fair value was based on the $191.99 closing price of AWI common shares on October 29, 2025.

Under which plan were the AWI RSUs granted?

They were granted under the 2016 Directors Stock Unit Plan as part of the nonemployee Director Compensation Program.

How are the AWI RSUs settled after vesting?

At the director’s election, units are acquirable at vesting on the next annual shareholders meeting date or at the director’s termination of service.

What is the ownership form of the reported AWI securities?

The 435 units are held in direct ownership.