Sprint resells access to Clearwire's WiMAX network as "Sprint 4G."
The company said in a regulatory filing on Thursday that it had about $1.11 billion in available cash and short-term investments as of Dec. 31 after selling stock and debt in the past few months. It doesn't expect cash flow from its operations this year, and said it believes it will need to raise "substantial additional capital" to fund its business beyond the next 12 months.
The company said it is unsure how much more money it will need, but that the main factor in determining that amount will depend on how much money it receives from Sprint for its services.
Sprint agreed to use Clearwire's new 4G network, called Long-Term Evolution, back in December. The announcement had been a lifeline for Clearwire, whose WiMax network has been bypassed by all phone companies except Sprint.
Clearwire said that how much money it needs depends on whether or not it successfully constructs and completes its LTE network to meet Sprint's requirements and how much Sprint uses its WiMAX network after 2013. The company said it has become increasingly dependent on its wholesale partners, particularly Sprint.
Clearwire said that it is looking at various options for securing more money, which could including asset sales or making some more equity securities offerings.
The company also disclosed in the filing that it may lose some or all of the sales it receives through Comcast Corp. and Time Warner Inc. this year because of the companies' deals with Verizon Wireless. Clearwire said the wholesale subscribers from Comcast and Time Warner made up less than 5 percent of its total wholesale subscribers as of Dec. 31.
Clearwire's deficit at year's end was about $1.62 billion. It had 914 employees at that time.
Overland Park, Kan.-based Sprint owns 54 percent of Kirkland, Wash.-based Clearwire.