Armstrong World Industries, Inc.
US ˙ NYSE ˙ US04247X1028

SecurityAWI / Armstrong World Industries, Inc.
InstitutionNeuberger Berman Group LLC
Latest Disclosed Ownership916,010 shares
Latest Disclosed Value $ 150,958,529
Neuberger Berman Group LLC reports 2.80% decrease in ownership of AWI / Armstrong World Industries, Inc.

On May 14, 2026 - Neuberger Berman Group LLC filed a 13F-HR form disclosing ownership of 916,010 shares of Armstrong World Industries, Inc. (US:AWI) valued at $150,958,448 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 942,415 shares of Armstrong World Industries, Inc.. This represents a change in shares of -2.80% during the quarter. The current value of the position is $142,118,952 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)
2026-05-14 2026-03-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 916,010 -26,405 -2.80 150,959 -16.18 0.0587
2026-02-13 2025-12-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 942,415 -54,234 -5.44 180,096 -7.81 0.1341
2025-11-12 2025-09-30 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 996,649 -8,877 -0.88 195,353 19.60 0.1428
2025-08-25 2025-06-30 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common 04247X102 1,005,526 -30,097 -2.91 163,338 11.95 0.1257
2025-08-13 2025-06-30 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 1,005,526 -30,097 163,338 0.0650
2025-05-13 2025-03-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 1,035,623 104,030 11.17 145,899 10.81 0.1222
2025-02-13 2024-12-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 931,593 333,983 55.89 131,662 67.63 0.1045
2024-11-14 2024-09-30 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 597,610 200,982 50.67 78,544 74.87 0.0613
2024-11-14 2024-06-30 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common 04247X102 396,628 253,970 178.03 44,914 153.47 0.0369
2024-08-13 2024-06-30 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 396,628 253,970 44,914 0.0369
2024-11-14 2024-03-31 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common 04247X102 142,658 139,892 5,057.56 17,721 6,438.75 0.0146
2024-05-13 2024-03-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 142,658 139,892 17,721 0.0146
2024-11-14 2023-12-31 13F/A-2 ARMSTRONG WORLD INDUSTRIES Common 04247X102 2,766 2,766 272 0.0002
2024-02-09 2023-12-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 2,766 2,766 272 0.0002
2023-02-13 2022-12-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 0 -3,255 -100.00 0 -100.00
2022-11-15 2022-09-30 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 3,255 575 21.46 258 28.36 0.0003
2022-08-15 2022-06-30 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 2,680 -174 -6.10 201 -21.79 0.0002
2022-05-23 2022-03-31 13F/A-1 ARMSTRONG WORLD INDUSTRIES Common 04247X102 2,854 -13 -0.45 257 -22.82 0.0002
2022-05-13 2022-03-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 2,854 -13 257 0.0001
2022-02-11 2021-12-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 2,867 2,867 333 0.0003
2019-11-13 2019-09-30 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 0 -2,428 -100.00 0 -100.00
2019-08-13 2019-06-30 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 2,428 -2,236 -47.94 236 -36.22 0.0003
2019-05-13 2019-03-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 4,664 -5,152 -52.49 370 -35.20 0.0005
2019-02-12 2018-12-31 13F ARMSTRONG WORLD INDUSTRIES Common 04247X102 9,816 9,816 571 0.0008
2015-02-05 2014-12-31 13F ARMSTRONG WORLD INDUSTRIES COMMON STOCK 04247X102 0 -494,358 -100.00 0 -100.00
2014-11-04 2014-09-30 13F ARMSTRONG WORLD INDUSTRIES COMMON STOCK 04247X102 494,358 104,614 26.84 27,684 23.68 0.0284
2014-08-05 2014-06-30 13F ARMSTRONG WORLD INDUSTRIES COMMON STOCK 04247X102 389,744 148,030 61.24 22,383 73.90 0.0219
2014-05-05 2014-03-31 13F ARMSTRONG WORLD INDUSTRIES COMMON STOCK 04247X102 241,714 241,714 12,871 0.0131
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.