[Form 4] ARMSTRONG WORLD INDUSTRIES INC Insider Trading Activity

Rhea-AI Filing Summary

Armstrong World Industries, Inc. (AWI)11/21/2025, the director reported a disposition of 300 shares of common stock at a stated price of $0 under transaction code G. Following this transaction, the director beneficially owns 3,941 stock units directly.

The remaining holdings are governed by the company’s 2016 Directors Stock Unit Plan, which states that vested units include vested and unvested units and units not yet acquirable. Under this plan, vested units become acquirable at the director’s election either on the one-year anniversary of the grant or at the time the director’s service ends.

11/24/2025 - 04:40 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^*

Osborne William H

(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)
11/21/2025

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	11/21/2025		G	V	300	D	$0	3,941(1)	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. Includes vested and unvested units as well as units not yet acquirable by the Director. Under the terms of the 2016 Directors Stock Unit Plan, as amended (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 at the one-year anniversary of the grant or (ii) the time of the Director's termination of service.

	/s/ Alan M. Kidd, Attorney-in-fact	11/24/2025
	** 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 insider transaction did Armstrong World Industries (AWI) report on this Form 4?

The Form 4 reports that a director of Armstrong World Industries (AWI) disposed of 300 shares of common stock on 11/21/2025 at a stated price of $0 under transaction code G.

How many Armstrong World Industries (AWI) shares or units does the director hold after the transaction?

After the reported transaction, the director beneficially owns 3,941 stock units of Armstrong World Industries, held directly.

What is the significance of transaction code G in the AWI Form 4?

The Form 4 lists the transaction as code G with a disposition of 300 common shares at $0. The filing does not further explain the code’s meaning beyond reporting it as the transaction type.

What does the 2016 Directors Stock Unit Plan mean for the AWI director’s units?

Under the 2016 Directors Stock Unit Plan, vested units include vested and unvested units and units not yet acquirable. Vested units can become acquirable at the director’s election either on the one-year anniversary of the grant or at the time of the director’s termination of service.

Is the AWI Form 4 filed by one or multiple reporting persons?

The Form 4 is indicated as being filed by one reporting person, not as a joint or group filing.

What is the reported relationship of the insider to Armstrong World Industries (AWI)?

The reporting person is listed as a Director of Armstrong World Industries, Inc. on the Form 4.