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Amazon, Expedia soar after earnings (AMZN) was among the most active issues on the stock market Friday, up more than $25 a share or 13 percent in midday trading after posting stronger-than expected earnings.

Expedia, (EXPE), the online travel agency, also soared Friday, by 28 percent at $41.69, even though the company posted a quarterly loss of $3.3 million. The company's adjusted earnings were better than expected, according to Reuters.

On the losing side, Allscripts Healthcare Solutions (MDRX) plunged 43 percent to a bit over $9 a share. Bloomberg reported the company, a provider of electronic health records, fired its chairman, and three directors resigned in protest.

Callaway Golf Co. (ELY), which posted earnings and revised guidance Thursday, was off 16 percent.

Consumer products giant Procter & Gamble (PG), one of the Dow industrials, was off 3 percent. The company cut its profit outlook amid growing competition, according to Reuters.

The Dow was up 30 points shortly before 12 noon, and other, broader indicators were also higher.

For a complete list of today's most active stock issues, click here.