Armstrong World Industries, Inc.
US ˙ NYSE ˙ US04247X1028

SecurityAWI / Armstrong World Industries, Inc.
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership335,874 shares
Latest Disclosed Value $ 55,352
Natixis Advisors, L.p. reports 0.69% decrease in ownership of AWI / Armstrong World Industries, Inc.

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 335,874 shares of Armstrong World Industries, Inc. (US:AWI) valued at $55,352,035 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 338,210 shares of Armstrong World Industries, Inc.. This represents a change in shares of -0.69% during the quarter. The current value of the position is $52,110,851 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-13 2026-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 335,874 -2,336 -0.69 55 -14.06 0.0770
2026-02-10 2025-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 338,210 12,151 3.73 65 1.59 0.0916
2025-11-13 2025-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 326,059 -21,972 -6.31 64 12.50 0.0933
2025-08-13 2025-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 348,031 -7,774 -2.18 57 12.00 0.0897
2025-05-08 2025-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 355,805 -163,583 -31.50 50 -31.51 0.0926
2025-02-10 2024-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 519,388 27,275 5.54 73 14.06 0.1372
2024-11-06 2024-09-30 13F ARMSTRONG WORLD INDS IN COM 04247X102 492,113 67,798 15.98 65 33.33 0.1261
2024-08-01 2024-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 424,315 110,111 35.04 48 23.08 0.1045
2024-04-25 2024-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 314,204 87,758 38.75 39 77.27 0.0897
2024-02-06 2023-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 226,446 -1,726 -0.76 22 37.50 0.0586
2023-11-13 2023-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 228,172 32,553 16.64 16 14.29 0.0502
2023-08-15 2023-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 195,619 14,974 8.29 14 16.67 0.0444
2023-05-11 2023-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 180,645 557 0.31 13 0.00 0.0443
2023-01-27 2022-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 180,088 -44,613 -19.85 12 -99.93 0.0467
2022-11-14 2022-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 224,701 3,777 1.71 17,803 7.51 0.0753
2022-08-12 2022-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 220,924 11,733 5.61 16,560 -12.05 0.0728
2022-05-12 2022-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 209,191 3,586 1.74 18,829 -21.14 0.0718
2022-02-08 2021-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 205,605 10,077 5.15 23,875 27.90 0.0912
2021-11-15 2021-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 195,528 9,329 5.01 18,667 -6.53 0.0768
2021-08-12 2021-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 186,199 7,700 4.31 19,972 24.20 0.0932
2021-05-05 2021-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 178,499 725 0.41 16,080 21.59 0.0839
2021-02-12 2020-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 177,774 44,412 33.30 13,225 44.11 0.0762
2020-11-12 2020-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 133,362 90,085 208.16 9,177 171.99 0.0577
2020-08-11 2020-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 43,277 15,312 54.75 3,374 51.91 0.0224
2020-04-27 2020-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 27,965 -40,277 -59.02 2,221 -65.37 0.0181
2020-02-10 2019-12-31 13F ARMSTRONG WORLD INDS INC COM 04247X102 68,242 -5,813 -7.85 6,413 -10.45 0.0452
2019-11-12 2019-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 74,055 -9,159 -11.01 7,161 -11.46 0.0568
2019-08-12 2019-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 83,214 -227 -0.27 8,088 22.06 0.0661
2019-05-15 2019-03-31 13F/A-1 ARMSTRONG WORLD INDS COM 04247X102 83,441 -26,431 -24.06 6,626 3.61 0.0580
2019-05-15 2019-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 83,441 -26,431 6,626
2019-02-13 2018-12-31 13F/A-1 ARMSTRONG WORLD INDS COM 04247X102 109,872 1,445 1.33 6,395 -15.25 0.0631
2019-02-13 2018-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 109,872 1,445 6,395
2018-11-13 2018-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 108,427 -37,978 -25.94 7,546 -18.44 0.0664
2018-08-14 2018-06-30 13F/A-1 ARMSTRONG WORLD INDS COM 04247X102 146,405 1,943 1.34 9,252 13.76 0.0884
2018-08-14 2018-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 146,405 9,252
2018-05-10 2018-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 144,462 32,246 28.74 8,133 19.69 0.0803
2018-02-14 2017-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 112,216 -35,569 -24.07 6,795 -10.27 0.0692
2017-11-14 2017-09-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 147,785 1,341 0.92 7,573 12.41 0.0800
2017-07-27 2017-06-30 13F ARMSTRONG WORLD INDS INC COM 04247X102 146,444 754 0.52 6,737 0.42 0.0729
2017-05-12 2017-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 145,690 75,152 106.54 6,709 127.58 0.0743
2017-02-07 2016-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 70,538 -35,005 -33.17 2,948 -32.40 0.0354
2016-11-04 2016-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 105,543 -4,882 -4.42 4,361 0.88 0.0565
2016-08-01 2016-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 110,425 3,853 3.62 4,323 -16.12 0.0598
2016-05-06 2016-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 106,572 32,006 42.92 5,154 51.14 0.0771
2016-02-12 2015-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 74,566 -5,269 -6.60 3,410 -10.52 0.0559
2015-11-12 2015-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 79,835 1,042 1.32 3,811 -9.22 0.0661
2015-08-14 2015-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 78,793 -694 -0.87 4,198 -8.12 0.0713
2015-05-15 2015-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 79,487 3,214 4.21 4,569 17.18 0.0802
2015-02-05 2014-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 76,273 -3,565 -4.47 3,899 -12.79 0.0730
2014-11-03 2014-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 79,838 -81,716 -50.58 4,471 -51.81 0.0897
2014-08-13 2014-06-30 13F ARMSTRONG WORLD INDS COM 04247X102 161,554 22,154 15.89 9,278 24.97 0.1329
2014-05-13 2014-03-31 13F ARMSTRONG WORLD INDS COM 04247X102 139,400 750 0.54 7,424 -7.06 0.1143
2014-02-12 2013-12-31 13F ARMSTRONG WORLD INDS COM 04247X102 138,650 -2,169 -1.54 7,988 3.22 0.1307
2013-10-30 2013-09-30 13F ARMSTRONG WORLD INDS COM 04247X102 140,819 -1,133 -0.80 7,739 14.08 0.1425
2013-07-19 2013-06-30 13F ARMSTRONG WORLD INDS SPONSORED ADR 04247X102 141,952 141,952 6,784 0.1352
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.