Shares of InPhonic (NASDAQ: INPC), NASDAQ's top percentage gainer Wednesday, are trading nearly 40% higher. The seller of wireless service and devices is due to report earnings Thursday after the markets close.

Shortly before Wednesday's close, InPhonic was trading at $3.74, 39% higher than Tuesday's $2.69 close.

Today's gains notwithstanding, InPhonic sits well beneath its 52-week high of $14.49, reached in February. Founded in 1999, InPhonic sells its service and products through e-commerce site Wirefly.com and other private online retailer sites. InPhonic compares prices on wireless services and products for customers.