AWI director granted 876 restricted stock units

Loughran Barbara reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Loughran Barbara reported acquisition or exercise transactions in this Form 4 filing.

Armstrong World Industries director Barbara Loughran received an equity grant of 876 restricted stock units as part of her annual Board retainer. The units were granted under the 2016 Directors Stock Unit Plan and the company’s nonemployee Director Compensation Program. They vest contingent on her continued Board service, or earlier upon death, total and permanent disability, or a defined Change in Control. The grant date fair value was based on the company’s June 12, 2026 closing share price of $154.21. After this award, she holds a total of 9,744 units, including vested, unvested and units not yet acquirable.

Insider Trade Summary

Grant/Award: 876 shares

Grant/Award 1 txn

Insider Loughran Barbara

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	876	$0.00	$0.00

Holdings After Transaction: Common Stock — 9,744 shares (Direct)

Footnotes (3)

1. F1. 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. F2. Represents an 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 June 12, 2026, which price was $154.21.
3. F3. 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.

Key Figures

RSU grant size: 876 units Post-grant holdings: 9,744 units Reference share price: $154.21 per share +1 more

4 metrics

RSU grant size 876 units Award of restricted stock units to director on June 12, 2026

Post-grant holdings 9,744 units Total vested, unvested and not-yet-acquirable units after transaction

Reference share price $154.21 per share Closing common share price on June 12, 2026 used for grant date fair value

Transaction code A (grant, award, or other acquisition) Indicates non-derivative grant of common stock units to director

Key Terms

restricted stock units, 2016 Directors Stock Unit Plan, Change in Control, Accounting Standards Codification Topic 718

4 terms

restricted stock units financial

"Restricted stock units granted under the 2016 Directors Stock Unit Plan"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

2016 Directors Stock Unit Plan financial

"Restricted stock units granted under the 2016 Directors Stock Unit Plan (the "2016 Plan")"

Change in Control financial

"the date of any Change in Control (as defined in the 2016 Plan)"

A "change in control" occurs when the ownership or management of a company shifts significantly, such as through a merger, acquisition, or sale of a large part of its assets. This change can impact how the company is run and may influence its future direction. For investors, it matters because it can affect the company's stability, strategy, and value, often signaling potential changes in investment risk or opportunity.

Accounting Standards Codification Topic 718 financial

"fair value of the units is calculated under the Financial Accounting Standards Board's Accounting Standards Codification Topic 718"

FAQ

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

What did AWI director Barbara Loughran report in this Form 4 filing?

Barbara Loughran reported receiving an award of 876 restricted stock units in Armstrong World Industries. The grant represents the equity portion of her annual Board retainer under the company’s nonemployee Director Compensation Program and 2016 Directors Stock Unit Plan.

How many Armstrong World Industries units does Barbara Loughran hold after this grant?

After this grant, Barbara Loughran holds 9,744 units in Armstrong World Industries. This total includes vested and unvested restricted stock units, as well as units that are not yet acquirable under the terms of the 2016 Directors Stock Unit Plan.

How is the grant date fair value of AWI restricted stock units calculated?

The grant date fair value is calculated under Accounting Standards Codification Topic 718 using Armstrong World Industries’ closing common share price. For this award, the calculation used the June 12, 2026 closing price of $154.21 per share to determine the grant’s accounting value.

When do Barbara Loughran’s AWI restricted stock units vest and become acquirable?

The restricted stock units vest on the earlier of the next annual shareholders meeting, death, total and permanent disability, or a Change in Control. Vested units become acquirable either at vesting on that meeting date or at her termination of service, at her election.

What plan governs the restricted stock unit grant to AWI director Barbara Loughran?

The grant is made under Armstrong World Industries’ 2016 Directors Stock Unit Plan, as part of its nonemployee Director Compensation Program. This plan defines vesting conditions, acquirability timing, and Change in Control provisions for directors’ restricted stock unit awards.

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

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Accepted by SEC EDGAR 06/15/2026 - 04:39 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^*

Loughran Barbara

(Last) (First) (Middle)

C/O ARMSTRONG WORLD INDUSTRIES, INC.

2500 COLUMBIA AVENUE

(Street)

LANCASTER PENNSYLVANIA 17603

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/12/2026

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(1)	06/12/2026		A		876(2)	A	$0	9,744(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 an 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 June 12, 2026, which price was $154.21.

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.

Remarks:

See Exhibit 24 - Power of Attorney

	/s/ Alan M. Kidd, Attorney-in-fact	06/15/2026
	** 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)