The current institutional shareholding score of Armstrong World Industries Inc is 10.00, ranking 1 out of 56 in the Homebuilding & Construction Supplies industry. The latest institutional shareholding proportion is 99.91%, representing a quarter-over-quarter decrease of 4.54%. The largest institutional shareholder is Donald Yacktman, holding a total of 763.71K shares, representing 1.74% of shares outstanding, with 0.09% increase in holdings.