Armstrong World Industries, Inc.
US ˙ NYSE ˙ US04247X1028

SecurityAWI / Armstrong World Industries, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership16,394 shares
Latest Disclosed Value $ 2,701,731
Citigroup Inc reports 38.01% decrease in ownership of AWI / Armstrong World Industries, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 16,394 shares of Armstrong World Industries, Inc. (US:AWI) valued at $2,701,731 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 26,447 shares of Armstrong World Industries, Inc.. This represents a change in shares of -38.01% during the quarter. The current value of the position is $2,504,184 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)
2026-05-11 2026-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 16,394 -10,053 -38.01 2,702 -46.56 0.0012
2026-02-13 2025-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 26,447 -6,859 -20.59 5,054 -22.58 0.0022
2025-11-10 2025-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 33,306 -13,360 -28.63 6,528 -13.88 0.0029
2025-08-11 2025-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 46,666 5,600 13.64 7,580 31.03 0.0037
2025-05-12 2025-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 41,066 7,168 21.15 5,785 20.77 0.0030
2025-02-12 2024-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 33,898 1,201 3.67 4,791 11.47 0.0028
2024-11-12 2024-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 32,697 2,215 7.27 4,297 24.51 0.0025
2024-08-12 2024-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 30,482 870 2.94 3,452 -6.17 0.0022
2024-05-10 2024-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 29,612 -7,159 -19.47 3,678 1.74 0.0024
2024-02-09 2023-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 36,771 20,107 120.66 3,615 201.50 0.0025
2023-12-06 2023-09-30 13F/A-1 ARMSTRONG WORLD INDS INC COM 04247X102 16,664 1,967 13.38 1,200 11.12 0.0009
2023-11-09 2023-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 16,664 1,967 1,200 0.0004
2023-08-10 2023-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 14,697 3,277 28.70 1,080 32.72 0.0007
2023-05-11 2023-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 11,420 -990 -7.98 814 -4.47 0.0006
2023-02-09 2022-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 12,410 -2,615 -17.40 851 -28.43 0.0007
2022-11-10 2022-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 15,025 -1,420 -8.63 1,189 -3.49 0.0009
2022-08-10 2022-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 16,445 -1,681 -9.27 1,232 -24.51 0.0009
2022-05-12 2022-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 18,126 -13,623 -42.91 1,632 -55.74 0.0010
2022-02-10 2021-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 31,749 -9,764 -23.52 3,687 -6.96 0.0020
2021-11-10 2021-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 41,513 -5,609 -11.90 3,963 -21.60 0.0023
2021-08-10 2021-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 47,122 2,479 5.55 5,055 25.68 0.0030
2021-05-13 2021-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 44,643 734 1.67 4,022 23.07 0.0026
2021-02-11 2020-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 43,909 1,107 2.59 3,268 10.93 0.0019
2020-11-12 2020-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 42,802 -25,548 -37.38 2,946 -44.71 0.0019
2020-08-12 2020-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 68,350 14,727 27.46 5,328 25.07 0.0042
2020-05-12 2020-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 53,623 -1,513 -2.74 4,260 -17.76 0.0039
2020-02-12 2019-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 55,136 -3,826 -6.49 5,180 -9.15 0.0038
2019-11-08 2019-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 58,962 5,181 9.63 5,702 9.09 0.0045
2019-08-12 2019-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 53,781 -1,210 -2.20 5,227 19.67 0.0042
2019-05-13 2019-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 54,991 3,367 6.52 4,368 45.36 0.0042
2019-02-12 2018-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 51,624 9,839 23.55 3,005 3.30 0.0030
2018-11-13 2018-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 41,785 2,128 5.37 2,909 16.04 0.0026
2018-08-10 2018-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 39,657 2,757 7.47 2,507 20.70 0.0023
2018-05-11 2018-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 36,900 -31,757 -46.25 2,077 -50.04 0.0017
2018-02-12 2017-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 68,657 31,030 82.47 4,157 115.61 0.0033
2017-11-13 2017-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 37,627 -5,895 -13.54 1,928 -3.74 0.0016
2017-08-11 2017-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 43,522 149 0.34 2,003 0.30 0.0018
2017-05-12 2017-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 43,373 -82,008 -65.41 1,997 -61.90 0.0018
2017-02-10 2016-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 125,381 593 0.48 5,241 1.63 0.0047
2016-11-10 2016-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 124,788 -32,456 -20.64 5,157 -16.23 0.0048
2016-08-12 2016-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 157,244 -27,075 -14.69 6,156 -30.95 0.0063
2016-05-13 2016-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 184,319 -97 -0.05 8,915 5.72 0.0100
2016-02-12 2015-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 184,416 -917 -0.49 8,433 -4.68 0.0084
2015-11-13 2015-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 185,333 184,478 21,576.37 8,847 19,132.61 0.0083
2015-08-13 2015-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 855 -2,781 -76.49 46 -77.99 0.0000
2015-05-14 2015-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 3,636 1,639 82.07 209 104.90 0.0002
2015-02-17 2014-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 1,997 -1,644 -45.15 102 -50.00 0.0001
2014-11-14 2014-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 3,641 -26,059 -87.74 204 -88.04 0.0002
2014-08-14 2014-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 29,700 9,973 50.56 1,705 62.23 0.0016
2014-05-15 2014-03-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 19,727 832 4.40 1,051 -3.49 0.0011
2014-02-14 2013-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 18,895 -2,930 -13.42 1,089 -9.17 0.0010
2013-11-14 2013-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 21,825 13,605 165.51 1,199 205.09 0.0011
2013-08-14 2013-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 8,220 8,220 393 0.0004
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.