1. Unum Group, of Chattanooga, the world’s biggest disability insurance company, has a market value of $7.1 billion
2. Mohawk Industries, the world’s biggest floorcovering company, based in Calhoun, Ga., has a market value of $3.8 billion.
3. CBL & Associates Properties Inc. in Chattanooga, one of the nation’s biggest shopping center development and management firms, has a market value of $2.4 billion
4. Astec Industries of Chattanooga, the nation’s biggest asphalt equipment maker, has a market value of $718.3 million.
5. Miller Industries Inc., of Chattanooga, the biggest tow truck manufacturer, has a market value of $171.9 million.