Satellite service provider Hughes Electronics (GMH) was down 7.1% in midafternoon after the company said its net loss more than doubled during the second quarter due to lower-than-expected net subscriber additions, a slowing retail market and losses from its satellite subsidiary.

The company, a unit of

General Motors

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, also cut its third-quarter and full-year revenue expectations. Hughes cut expectations for subscriber growth for its


service for the second time.