Armstrong World Industries, Inc.
US ˙ NYSE ˙ US04247X1028

SecurityAWI / Armstrong World Industries, Inc.
InstitutionMan Group plc
Latest Disclosed Ownership94,167 shares
Latest Disclosed Value $ 15,518,722
Man Group plc reports 13.89% increase in ownership of AWI / Armstrong World Industries, Inc.

On May 15, 2026 - Man Group plc filed a 13F-HR form disclosing ownership of 94,167 shares of Armstrong World Industries, Inc. (US:AWI) valued at $15,518,722 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 82,684 shares of Armstrong World Industries, Inc.. This represents a change in shares of 13.89% during the quarter. The current value of the position is $14,384,009 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 94,167 11,483 13.89 15,519 -1.78 0.0282
2026-02-17 2025-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 82,684 -13,502 -14.04 15,801 -16.19 0.0269
2025-11-14 2025-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 96,186 50,850 112.16 18,853 156.02 0.0328
2025-08-14 2025-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 45,336 4,047 9.80 7,364 26.62 0.0140
2025-05-15 2025-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 41,289 13,196 46.97 5,817 46.50 0.0147
2025-02-14 2024-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 28,093 -10,311 -26.85 3,970 -21.34 0.0104
2024-11-14 2024-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 38,404 -23,910 -38.37 5,047 -28.47 0.0131
2024-08-14 2024-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 62,314 -4,759 -7.10 7,056 -15.30 0.0178
2024-05-15 2024-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 67,073 -81,137 -54.74 8,332 -42.83 0.0210
2024-02-14 2023-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 148,210 14,572 -5.57 0.0406
2023-11-14 2023-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 15,433 90.40 0.0478
2023-08-14 2023-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 110,334 8,105 35.42 0.0250
2023-05-15 2023-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 5,986 37.94 0.0213
2023-02-14 2022-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 63,264 20,954 49.52 4,339 29.45 0.0156
2022-11-14 2022-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 42,310 3,352 -33.68 0.0156
2022-08-15 2022-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 5,054 -33.18 0.0214
2022-05-16 2022-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 84,039 48,206 134.53 7,564 81.78 0.0263
2022-02-14 2021-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 35,833 8,744 32.28 4,161 60.84 0.0134
2021-11-15 2021-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 27,089 166 0.62 2,587 -10.42 0.0091
2021-08-16 2021-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 26,923 1,839 7.33 2,888 27.79 0.0102
2021-05-17 2021-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 25,084 -1,505 -5.66 2,260 14.26 0.0099
2021-02-16 2020-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 26,589 -109,603 -80.48 1,978 -78.89 0.0087
2020-11-16 2020-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 136,192 87,688 180.79 9,371 147.84 0.0369
2020-08-14 2020-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 48,504 -44,514 -47.86 3,781 -48.82 0.0191
2020-05-15 2020-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 93,018 -47,162 -33.64 7,388 -43.92 0.0479
2020-02-18 2019-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 140,180 32,728 30.46 13,173 26.79 0.0433
2019-11-14 2019-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 107,452 -3,848 -3.46 10,390 -3.96 0.0386
2019-08-14 2019-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 111,300 2,353 2.16 10,818 25.03 0.0391
2019-05-15 2019-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 108,947 70,872 186.14 8,652 290.26 0.0328
2019-02-14 2018-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 38,075 -651 -1.68 2,217 -17.77 0.0099
2018-11-14 2018-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 38,726 31,283 420.30 2,696 473.62 0.0098
2018-08-14 2018-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 7,443 418 5.95 470 18.69 0.0019
2018-05-15 2018-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 7,025 7,025 396 0.0018
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.