Clearwire, a wireless broadband services provider, and Telemar, a Brazilian fixed-line, mobile and broadband operator, have filed to go public, taking the pipeline of telecom flotations in the US to $2.5bn (€1.9bn).

Clearwire is led by chairman and chief executive Craig McCaw, who has been labelled a wireless pioneer. He put together McCaw Cellular Communications, the first nationwide cellular empire in the US, which he sold to AT&T for $11.4bn in 1994.