FORTUNE LIST | Fastest growing

The Top 10 fastest-growing companies as listed by Fortune magazine:

1. NutriSystem, Horsham, Pa., online diet company.

2. Hansen Natural, Corona, Calif., energy drinks maker.

3. Arena Resources, Tulsa, Okla., oil and gas.

4. Intuitive Metals, Sunnyvale, Calif., surgical robot maker.

5. Titanium Metals, Dallas, metal producer.

6. Apple, Cupertino, Calif., computers, iPhone.

7. RTI International Metals, Weathersfield, specialty metals maker.

8. Dynamic Materials, Boulder, Colo., explosion-welder of incompatible metals.

9. Southern Copper, Phoenix, mining.

10. Global Industries, Carlyss, La., marine construction.