As of January 2026 Armstrong World Industries has a market cap of ยฃ5.80 Billion. This makes Armstrong World Industries the world's 2347th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Jan 29th, 2026 the market cap of Armstrong World Industries was reported to be: