Armstrong World Industries, Inc.
US ˙ NYSE ˙ US04247X1028

SecurityAWI / Armstrong World Industries, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership459,191 shares
Latest Disclosed Value $ 75,674,922
Morgan Stanley reports 6.99% decrease in ownership of AWI / Armstrong World Industries, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 459,191 shares of Armstrong World Industries, Inc. (US:AWI) valued at $75,674,677 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 493,726 shares of Armstrong World Industries, Inc.. This represents a change in shares of -6.99% during the quarter. The current value of the position is $70,141,425 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 459,191 -34,535 -6.99 75,675 -19.80 0.0046
2026-05-27 2025-12-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 493,726 33,157 7.20 94,351 4.51 0.0056
2026-02-13 2025-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 493,726 33,157 94,351 0.0056
2026-05-27 2025-09-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 460,569 72,183 18.59 90,277 43.09 0.0055
2025-11-14 2025-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 460,569 72,183 90,277 0.0055
2025-08-15 2025-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 388,386 31,001 8.67 63,090 25.31 0.0041
2025-05-15 2025-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 357,385 7,767 2.22 50,349 1.90 0.0036
2025-05-15 2024-12-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 349,618 22,754 6.96 49,412 15.02 0.0035
2025-02-14 2024-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 349,618 22,754 49,412 0.0035
2025-05-14 2024-09-30 13F/A-2 ARMSTRONG WORLD INDS INC COM 04247X102 326,864 17,821 5.77 42,960 22.75 0.0031
2025-02-14 2024-09-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 326,864 17,821 42,960 0.0031
2024-11-14 2024-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 326,864 17,821 42,960 0.0004
2025-05-14 2024-06-30 13F/A-2 ARMSTRONG WORLD INDS INC COM 04247X102 309,043 5,854 1.93 34,996 -7.08 0.0027
2024-10-17 2024-06-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 309,043 5,854 34,996 0.0027
2024-08-14 2024-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 309,043 5,854 34,996 0.0027
2024-10-17 2024-03-31 13F/A-2 ARMSTRONG WORLD INDS INC COM 04247X102 303,189 50,910 20.18 37,662 51.84 0.0030
2024-08-16 2024-03-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 303,189 50,910 37,662 0.0004
2024-05-15 2024-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 303,189 50,910 37,662 0.0030
2024-08-16 2023-12-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 252,279 88,987 54.50 24,804 110.97 0.0022
2024-02-13 2023-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 252,279 88,987 24,804 0.0022
2023-11-15 2023-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 163,292 -14,831 -8.33 11,757 -10.14 0.0012
2023-08-14 2023-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 178,123 50,099 39.13 13,085 43.46 0.0013
2023-05-15 2023-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 128,024 21,402 20.07 9,120 24.71 0.0010
2023-02-14 2022-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 106,622 -35,871 -25.17 7,313 -35.23 0.0008
2022-11-14 2022-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 142,493 -14,648 -9.32 11,290 -4.15 0.0015
2022-10-27 2022-06-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 157,141 12,354 8.53 11,779 -9.61 0.0015
2022-08-15 2022-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 157,141 12,354 11,779 0.0015
2022-10-27 2022-03-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 144,787 112,095 342.88 13,032 243.31 0.0018
2022-05-13 2022-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 144,787 112,095 13,032 0.0018
2022-02-14 2021-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 32,692 -25,120 -43.45 3,796 -31.23 0.0005
2021-11-15 2021-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 57,812 33,178 134.68 5,520 108.85 0.0007
2021-08-23 2021-06-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 24,634 -3,925 -13.74 2,643 2.76 0.0003
2021-08-16 2021-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 24,634 -3,925 2,643 0.0001
2021-05-17 2021-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 28,559 -101,356 -78.02 2,572 -73.39 0.0004
2021-02-16 2020-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 129,915 98,831 317.95 9,664 351.80 0.0015
2020-11-13 2020-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 31,084 -1,459 -4.48 2,139 -15.69 0.0004
2020-08-14 2020-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 32,543 -38,415 -54.14 2,537 -54.99 0.0006
2020-05-26 2020-03-31 13F/A-1 ARMSTRONG WORLD INDS COM 04247X102 70,958 31,093 78.00 5,636 50.45 0.0015
2020-05-15 2020-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 70,958 31,093 5,636 432.9623
2020-02-14 2019-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 39,865 863 2.21 3,746 -0.66 0.0009
2019-11-14 2019-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 39,002 -5,385 -12.13 3,771 -12.57 0.0010
2019-08-14 2019-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 44,387 20,025 82.20 4,313 122.89 0.0011
2019-05-15 2019-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 24,362 3,562 17.12 1,935 59.92 0.0005
2019-02-14 2018-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 20,800 -779 -3.61 1,210 -19.44 0.0004
2019-04-23 2018-09-30 13F/A-2 ARMSTRONG WORLD INDS INC COM 04247X102 21,579 -5,785 -21.14 1,502 -13.13 0.0004
2018-11-20 2018-09-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 21,579 0 1,502 0.0004
2018-11-14 2018-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 21,579 -5,785 1,502
2019-04-23 2018-06-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 27,364 15,288 126.60 1,729 154.26 0.0005
2018-08-14 2018-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 27,364 15,288 1,729
2019-04-23 2018-03-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 12,076 1,000 9.03 680 1.49 0.0002
2018-05-14 2018-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 12,076 1,000 680
2019-04-23 2017-12-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 11,076 -932 -7.76 670 8.94 0.0002
2018-02-14 2017-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 11,076 -932 670
2017-11-14 2017-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 12,008 3,376 39.11 615 55.30 0.0002
2017-08-11 2017-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 8,632 -39,814 -82.18 396 -82.25 0.0001
2017-05-22 2017-03-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 48,446 22,211 84.66 2,231 103.56 0.0007
2017-05-12 2017-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 48,446 2,231
2017-02-22 2016-12-31 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 26,235 -824 -3.05 1,096 -2.06 0.0004
2017-02-13 2016-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 26,235 1,096
2016-11-10 2016-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 27,059 81 0.30 1,119 5.87 0.0004
2016-08-12 2016-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 26,978 -625 -2.26 1,057 -20.82 0.0004
2016-05-12 2016-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 27,603 -138,100 -83.34 1,335 -82.38 0.0005
2016-02-09 2015-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 165,703 -378,260 -69.54 7,577 -70.82 0.0027
2016-02-08 2015-09-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 543,963 -609,598 -52.84 25,968 -57.75 0.0096
2015-11-09 2015-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 543,963 25,968
2015-08-12 2015-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,153,561 348,992 43.38 61,461 32.92 0.0213
2015-05-14 2015-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 804,569 -267,788 -24.97 46,238 -15.65 0.0170
2015-02-13 2014-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,072,357 243,431 29.37 54,817 18.09 0.0200
2014-12-16 2014-09-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 828,926 -582,835 -41.28 46,421 -42.74 0.0178
2014-11-14 2014-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 828,926 46,421
2014-08-12 2014-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,411,761 709,378 101.00 81,077 116.77 0.1387
2014-05-13 2014-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 702,383 280,745 66.58 37,402 53.98 0.0157
2014-02-13 2013-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 421,638 257,312 156.59 24,290 168.96 0.0103
2013-11-13 2013-09-30 13F ARMSTRONG WLD COM 04247X102 164,326 -73,872 -31.01 9,031 -20.66 0.0043
2013-08-08 2013-06-30 13F ARMSTRONG WLD COM 04247X102 238,198 238,198 11,383 0.0057
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.