WiMAX provider Clearwire posted a quarterly operating loss due in part to growing marketing expenses as the company works to expand services and sign up new subscribers. Clearwire posted a fourth-quarter adjusted loss of $83.1 million compared with a loss of $62 million for the same period last year, while total revenue rose to $45.4 million from $23.7 million year over year.

The company posted average monthly revenue per user of $36, slightly below what it posted for the fourth quarter last year.

Although its quarterly results were much in line with market expectations, investors and analysts were disappointed the company did not announce a network-sharing agreement with Sprint Nextel. Earlier, the two scrapped their previous WiMAX contract, but both parties have said they are back in talks, and there has been news of possible outside investment.