Tellabs, Inc. is a telecommunications company that designs and manufactures equipment for service providers.

Ranked among the BusinessWeek InfoTech 100, Tellabs is part of the NASDAQ-100

NASDAQ-100

The NASDAQ-100 is a stock market index of 100 of the largest non-financial companies listed on the NASDAQ. It is a modified capitalization-weighted index. The companies' weights in the index are based on their market capitalizations, with certain rules capping the influence of the largest components...

 Index, NASDAQ Global Select Market, Ocean Tomo 300 Patent Index and the S&P 500

S&P 500

The S&P 500 is a free-float capitalization-weighted index published since 1957 of the prices of 500 large-cap common stocks actively traded in the United States. The stocks included in the S&P 500 are those of large publicly held companies that trade on either of the two largest American stock...

. Over one third of the world's wireless calls travel via networks owned by Tellabs customers such as T-Mobile

T-Mobile

T-Mobile International AG is a German-based holding company for Deutsche Telekom AG's various mobile communications subsidiaries outside Germany. Based in Bonn, Germany, its subsidiaries operate GSM and UMTS-based cellular networks in Europe, the United States, Puerto Rico and the US Virgin Islands...

 and Verizon Communications

Verizon Communications

Verizon Communications Inc. is a global broadband and telecommunications company and a component of the Dow Jones Industrial Average...

Along with stand-alone products, Tellabs offers integrated systems to telecom service providers, Multi-Service Operators (MSOs) and wireless companies that cover a variety of functions.