Enterprise solutions providers SkyBitz and AirClic were among the companies in the Top 10 of the inaugural Wireless Fast 50. The rankings were compiled by Deloitte & Touche USA and the CTIA to spotlight the industry's fastest-growing wireless companies.

The rankings are based on revenue growth over the past five years. (The top 25 are below.)

01 SIRIUS Satellite Radio New York, NY 79,060%

02 SkyBitz Sterling,VA 40,314%

03 TeleNav Sunnyvale, CA 16,666%

04 BTI Systems Ottawa, ON 16,610%

05 Tira Wireless Toronto, ON 16,610%

06 MyThum Interactive Toronto, ON 13,900%

07 Boingo Wireless Santa Monica, CA 13,398%

08 NetMotion Wireless Seattle,WA 7,504%

09 Ethertronics San Diego, CA 6,603%

10 AirClic Newtown, PA 5,895%

11 XM Satellite Radio Holdings Washington, DC 4,525%

12 mBlox Sunnyvale, CA 3,689%

13 Airvana Chelmsford, MA 3,628%

14 Roamware San Jose, CA 3,228%

15 SiGe Semiconductor Methuen, MA 3,221%

16 Vibes Media Chicago, IL 2,341%

17 WebTech Wireless Burnaby, BC 1,888%

18 Redline Communications Markham, ON 1,417%

19 Enfora Richardson, TX 1,276%

20 Atheros Communications Santa Clara, CA 1,259%

21 Axesstel San Diego, CA 1,106%

22 MetroPCS Communications Dallas, TX 1,096%

23 Tranzeo Wireless Technologies Pitt Meadows, BC 1,072%

24 Vertical Communications Cambridge, MA 815%

25 DragonWave Kanata, ON 683%

Sirius Satellite Radio reaches 7.1 million customers with its service and topped the list, followed by SkyBitz, TeleNav, BTI Systems and Tira Wireless.

SkyBitz provides satellite-based global positioning for transportation security. The company uses wireless asset tracking to keep tabs on 135,000 trailers and containers in North America.

BTI Systems enables wireless carriers to distribute data to end-users through its fiberoptic microWDM solutions.

Tira Wireless provides mobile content development tools for developers and publishers.

No. 10-ranked AirClic offers solutions for tracking people, processes and action in the field service arena.

The growth of the companies featured in the rankings reflects a number of industry trends, according to Deloitte:

* Wireless device usage is surpassing that of landlines.

* Mobile devices increasingly are being used for applications beyond voice.

* Mobility is changing the way people work, communicate and think about entertainment which is, in turn, disrupting business models.

To qualify for the Wireless Fast 50, companies must have had operating revenues of at least $50,000 in 2002 and $5 million in 2006. A company can be headquartered anywhere in the world. It must own proprietary wireless technology or proprietary wireless intellectual property that contributes to a significant portion of the company's operating revenues or devote a significant proportion of revenues to the research and development of wireless technology. Using other companies' wireless technology or intellectual property in a unique way does not qualify.

-SUSAN NUNZIATA