Armstrong World Industries, Inc.
US ˙ NYSE ˙ US04247X1028

SecurityAWI / Armstrong World Industries, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership1,414,904 shares
Latest Disclosed Value $ 233,176,179
State Street Corp reports 3.05% increase in ownership of AWI / Armstrong World Industries, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,414,904 shares of Armstrong World Industries, Inc. (US:AWI) valued at $233,176,179 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,372,982 shares of Armstrong World Industries, Inc.. This represents a change in shares of 3.05% during the quarter. The current value of the position is $216,777,442 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.

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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 1,414,904 41,922 3.05 233,176 -11.13 0.0081
2026-02-13 2025-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,372,982 -2,613 -0.19 262,377 -2.69 0.0088
2025-11-14 2025-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,375,595 -7,243 -0.52 269,630 20.03 0.0093
2025-08-14 2025-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,382,838 -63,053 -4.36 224,628 10.28 0.0084
2025-05-15 2025-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,445,891 -59,191 -3.93 203,697 -4.24 0.0084
2025-02-14 2024-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,505,082 50,932 3.50 212,713 11.30 0.0084
2024-11-14 2024-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,454,150 51,839 3.70 191,119 20.35 0.0078
2024-08-14 2024-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,402,311 -38,625 -2.68 158,798 -11.28 0.0069
2024-05-15 2024-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,440,936 15,373 1.08 178,993 27.71 0.0080
2024-02-14 2023-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,425,563 709,783 99.16 140,161 171.97 0.0068
2023-11-14 2023-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 715,780 5,595 0.79 51,536 -1.22 0.0029
2023-08-14 2023-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 710,185 -5,147 -0.72 52,170 2.37 0.0027
2023-05-15 2023-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 715,332 22,781 3.29 50,960 7.28 0.0029
2023-05-15 2022-12-31 13F/A-99 ARMSTRONG WORLD INDS INC COM 04247X102 692,551 -15,716 -2.22 47,502 -15.35 0.0028
2023-05-15 2022-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 692,551 -15,716 47,502 0.0028
2022-11-15 2022-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 708,267 49,432 7.50 56,116 13.63 0.0035
2022-08-15 2022-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 658,835 -46,184 -6.55 49,386 -22.18 0.0030
2022-05-16 2022-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 705,019 23,434 3.44 63,459 -19.82 0.0031
2022-02-14 2021-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 681,585 240 0.04 79,146 21.67 0.0038
2021-11-15 2021-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 681,345 -2,315 -0.34 65,048 -11.29 0.0034
2021-08-16 2021-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 683,660 103,300 17.80 73,329 40.25 0.0039
2021-07-09 2021-03-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 580,360 -327 -0.06 52,285 21.04 0.0030
2021-05-17 2021-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 580,360 -327 52,285 0.0030
2021-02-16 2020-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 580,687 15,022 2.66 43,197 10.98 0.0026
2020-11-10 2020-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 565,665 -194,536 -25.59 38,923 -34.32 0.0027
2020-08-14 2020-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 760,201 -51,104 -6.30 59,265 -8.02 0.0043
2020-06-19 2020-03-31 13F/A-1 ARMSTRONG WORLD INDS COM 04247X102 811,305 3,571 0.44 64,434 -15.11 0.0056
2020-05-11 2020-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 811,305 3,571 64,434 5,658.6026
2020-02-06 2019-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 807,734 19,475 2.47 75,903 -0.42 0.0052
2019-11-14 2019-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 788,259 7,481 0.96 76,225 0.44 0.0057
2019-08-14 2019-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 780,778 52,560 7.22 75,892 31.22 0.0057
2019-05-15 2019-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 728,218 -72,630 -9.07 57,835 24.06 0.0045
2019-02-12 2018-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 800,848 -33,175 -3.98 46,617 -19.69 0.0042
2018-11-09 2018-09-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 834,023 27,505 3.41 58,048 13.88 0.0045
2018-08-14 2018-06-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 806,518 -43,469 -5.11 50,973 6.52 0.0043
2018-05-15 2018-03-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 849,987 -73,514 -7.96 47,854 -14.42 0.0041
2018-02-14 2017-12-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 923,501 252,983 37.73 55,916 62.71 0.0045
2017-11-14 2017-09-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 670,518 -344,466 -33.94 34,365 -26.40 0.0030
2017-08-14 2017-06-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,014,984 32,325 3.29 46,689 3.17 0.0041
2017-05-15 2017-03-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 982,659 -83,162 -7.80 45,254 1.58 0.0040
2017-02-09 2016-12-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,065,821 -74,991 -6.57 44,552 -5.49 0.0042
2017-01-13 2016-09-30 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,140,812 -145,365 -11.30 47,140 -6.38 0.0048
2016-11-14 2016-09-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,140,812 47,140
2016-08-12 2016-06-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,286,177 88,003 7.34 50,355 -13.12 0.0054
2016-05-20 2016-03-31 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,198,174 -236,049 -16.46 57,962 -11.62 0.0063
2016-05-12 2016-03-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,198,174 57,962
2016-02-16 2015-12-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,434,223 -311,935 -17.86 65,585 -21.33 0.0072
2015-11-16 2015-09-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,746,158 159,202 10.03 83,366 -1.41 0.0097
2015-08-13 2015-06-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,586,956 -215,440 -11.95 84,558 -18.37 0.0090
2015-05-15 2015-03-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,802,396 273,907 17.92 103,584 32.57 0.0106
2015-02-11 2014-12-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,528,489 86,084 5.97 78,135 -3.27 0.0078
2014-11-12 2014-09-30 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,442,405 -34,796 -2.36 80,776 -4.78 0.0087
2014-11-10 2014-09-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,442,405 80,776
2014-08-12 2014-06-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,477,201 69,871 4.96 84,832 13.20 0.0092
2014-05-15 2014-03-31 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,407,330 34,503 2.51 74,943 -5.24 0.0085
2014-05-13 2014-03-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,407,330 74,943
2014-02-06 2013-12-31 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,372,827 -34,349 -2.44 79,083 2.27 0.0088
2014-02-06 2013-12-31 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,694,692 85,973
2013-11-12 2013-09-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,407,176 -407,003 -22.43 77,330 -10.80 0.0095
2013-08-08 2013-06-30 13F ARMSTRONG WORLD INDUSTRIES Common equity shares 04247X102 1,814,179 1,814,179 86,697 0.0113
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.