South Korea's top tech behemoth Samsung Electronics Co. said Wednesday its third-quarter operating income is estimated to have risen 79.8 percent from a year earlier, far beating market estimates.

Operating income is estimated at 7.3 trillion won ($6.25 billion) for the July-September period, compared with the 4.06 trillion won posted a year earlier, Samsung said in a regulatory filing.   

The third-quarter operating income also marks a 5.8 percent rise from the 6.9 trillion won posted for the earlier three-month period.

Sales reached 51 trillion won in the three-month period, up 7.48 percent from a year earlier and 5.07 percent from three months earlier.

Samsung didn't offer a net profit estimate for the third quarter. Its finalized earnings will be announced later this month.

The results hovered far above the survey of 16 brokerage houses conducted by Yonhap Infomax, the financial arm of Yonhap News Agency, which put their median operating income estimate at 6.5 trillion won.

Shares of Samsung Electronics closed at 1,151,000 won on the main bourse Tuesday, up 3.23 percent from the previous session. The earnings guidance was released before the local stock market opened. (Yonhap)