Apple has reported revenue of $8.34 billion for the third quarter of 2009, up 12% compared to revenue of $7.46 billion for the same quarter of 2008, primarily driven by an increase in iPhone sales.

The company has posted a net profit of $1.23 billion, or $1.35 per diluted share, up 15% compared to a net profit of $1.07 billion, or $1.19 per diluted share for the same period last year. Its gross margin was up to 36.3% from 34.8% for the year-ago quarter. International sales accounted for 44% of the quarter’s revenue.

Apple sold 2.6 million Macintosh computers during the quarter, representing a 4% unit increase over the third quarter of 2008. The company sold 10.2 million iPods during the quarter, down 7% compared to the same period last year while iPhones sold were 5.2 million, representing 626% unit growth over the year-ago quarter.

Steve Jobs, CEO of Apple, said: “We’re making our most innovative products ever and our customers are responding. We’re thrilled to have sold over 5.2 million iPhones during the quarter and users have downloaded more than 1.5 billion applications from our App Store in its first year.”

Looking ahead in fourth quarter of 2009, the company expects revenue to be in the range of $8.7 billion to $8.9 billion and diluted earnings per share in the range of $1.18 to $1.23.