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| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2018 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 0 | -140,100 | 0 | -9,751,000 | |
| 09/30/2018 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 140,100 | -4,377,615 | 9,751,000 | -275,769,000 | $69.60 |
| 07/31/2018 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 2,693,661 | -1,982,003 | 182,899,582 | -80,340,418 | $67.90 |
| 06/30/2018 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 4,517,715 | -157,949 | 285,520,000 | 22,280,000 | $63.20 |
| 03/31/2018 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 4,675,664 | 43,666 | 263,240,000 | -17,227,000 | $56.30 |
| 12/31/2017 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 5,739,634 | 1,281,822 | 347,534,839 | 119,071,839 | $60.55 |
| 09/30/2017 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 4,457,812 | -292,863 | 228,463,000 | 9,932,000 | $51.25 |
| 06/30/2017 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 4,750,675 | 336,960 | 218,531,000 | 15,279,000 | $46.00 |
| 03/31/2017 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 4,413,715 | 746,618 | 203,252,000 | 49,967,000 | $46.05 |
| 12/31/2016 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 3,667,097 | -148,295 | 153,285,000 | -4,367,000 | $41.80 |
| 09/30/2016 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 3,815,392 | -80,388 | 157,652,000 | 5,132,000 | $41.32 |
| 06/30/2016 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 3,895,780 | 3,895,780 | 152,520,000 | 152,520,000 | $39.15 |
| 06/30/2009 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 0 | -182,478 | 0 | -2,009,000 | |
| 03/31/2009 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 182,478 | -805,153 | 2,009,000 | -19,344,000 | $11.01 |
| 12/31/2008 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 987,631 | -50,772 | 21,353,000 | -8,657,000 | $21.62 |
| 09/30/2008 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 1,038,403 | -915,678 | 30,010,000 | -27,088,000 | $28.90 |
| 06/30/2008 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 1,954,081 | 107,942 | 57,098,000 | -8,735,000 | $29.22 |
| 03/31/2008 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 1,846,139 | 24,619 | 65,833,000 | -7,228,000 | $35.66 |
| 12/31/2007 | ARMSTRONG WORLD INDUSTRIES INC | AWI | 1,821,520 | 1,821,520 | 73,061,000 | 73,061,000 | $40.11 |
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