Armstrong World Industries, Inc.
US ˙ NYSE ˙ US04247X1028

SecurityAWI / Armstrong World Industries, Inc.
InstitutionCerity Partners LLC
Latest Disclosed Ownership24,770 shares
Latest Disclosed Value $ 4,082,092
Cerity Partners LLC reports 16.03% decrease in ownership of AWI / Armstrong World Industries, Inc.

On May 15, 2026 - Cerity Partners LLC filed a 13F-HR form disclosing ownership of 24,770 shares of Armstrong World Industries, Inc. (US:AWI) valued at $4,082,096 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 29,497 shares of Armstrong World Industries, Inc.. This represents a change in shares of -16.03% during the quarter. The current value of the position is $3,783,618 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 24,770 -4,727 -16.03 4,082 -27.57 0.0029
2026-02-11 2025-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 29,497 -10,410 -26.09 5,637 -27.95 0.0082
2025-10-22 2025-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 39,907 12,788 47.16 7,822 77.57 0.0127
2025-08-13 2025-06-30 13F ARMSTRONG WORLD INDS INC Stock 04247X102 27,119 6,195 29.61 4,405 49.47 0.0079
2025-04-30 2025-03-31 13F ARMSTRONG WORLD INDS INC Stock 04247X102 20,924 4,165 24.85 2,948 24.98 0.0060
2025-02-13 2024-12-31 13F ARMSTRONG WORLD INDS INC Stock 04247X102 16,759 -279 -1.64 2,358 5.31 0.0051
2024-11-12 2024-09-30 13F ARMSTRONG WORLD INDS INC Stock 04247X102 17,038 4,044 31.12 2,239 52.21 0.0050
2024-08-13 2024-06-30 13F ARMSTRONG WORLD INDS INC Stock 04247X102 12,994 2,954 29.42 1,471 17.96 0.0039
2024-05-14 2024-03-31 13F ARMSTRONG WORLD INDS INC Equities 04247X102 10,040 3,716 58.76 1,247 100.81 0.0033
2024-01-26 2023-12-31 13F ARMSTRONG WORLD INDS INC Stock 04247X102 6,324 6,324 622 0.0020
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.