| Industry | HHI | Largest firms |
| PC operating systems | 9,182 | Microsoft, Linux |
| Wid | 5,098 | Boeing, Airbus |
| Diamond mining | 2,338 | De Beers, Alrosa, Rio Tinto |
| Automobiles | 1,432 | GM, Ford, Chrysler, Toyota, Honda, Nissan, VW |
| Movie distributors | 1,096 | Buena Vista, Sony Pictures, 20th Century Fox, Warner Bros., Universal, Paramount, Lionsgate |
| Internet service providers | 750 | SBC, Comcast, AOL, Verizon, Road Runner, Earthlink, Charter, Qwest |
| Retail grocers | 321 | Walmart, Kroger, Sears, Target, Costco, Walgreens, Ahold, Albertsons |
Source: Canadian Government; Diamond Facts 2006; www.w3counter.com; Planet retail; Autodata; Reuters; ISP Planet; Swivel. Data cover 200