NEW YORK — Media and entertainment company CBS Corp. is buying CNet Networks Inc., an online news and information provider, for $1.8 billion in cash in its latest bid to expand its reach on the Internet, the companies announced Thursday.

The price of $11.50 per share for CNet represents a massive premium of 45 percent over CNet's closing stock price on Wednesday, and appears to get CNet out of a nasty battle with one of its largest shareholders, which had been agitating for a shakeup at the company after its stock slumped.

CNet shares soared nearly 44 percent in morning trading.

CBS's CEO Leslie Moonves told reporters on a conference call that acquiring access to CNet's large online audience in order to distribute media content from CBS was "a large part" of CBS' motivation in going after the San Francisco-based online company.

"Our idea is to have our content wherever, whenever you can get it, and adding CNet just makes that happen faster," Moonves said.

Despite the high premium CBS is paying for CNet, CBS's chief financial officer Fred Reynolds called the price "fair" said the acquisition would immediately add to CBS's earnings. CBS will fund the acquisition with cash on hand.

CNet is an early pioneer in the Internet, and now includes a large stable of businesses in the entertainment, news and music areas such as ZDNet, GameSpot.com, TV.com, mp3.com.

Moonves said he saw opportunities for distributing CBS news, music and other content on CNet's online outlets, and also for tapping CNet's significant online advertising sales operation to boost over ad growth for the media company.

CBS has been aggressive in finding new online outlets for its entertainment programming as more people shift their media consumption from traditional outlets like TV and radio to the Internet.

CBS online properties include CBS.com, CBSSports.com and CBSNews.com.

The acquisition, expected to close in the third quarter after shareholder and regulatory approval, would make CBS one of the 10 most popular Internet companies in the U.S., with 54 million unique visitors a month and approximately 200 million uses worldwide, CBS said.

CBS, which is also a major radio broadcaster, inked a deal in March to provide audio programming from all 140 of its radio stations to Time Warner Inc.'s AOL music service.

A group of investors led by New York hedge fund Jana Partners LLC has been agitating for a shake-up at CNet after its shares fell sharply in the past year. Jana Partners has led a proxy fight to get a slate of directors elected to the CNet board.

The investors say CNet's management has failed to take advantage of the company's online presence to grow revenue as quickly as the advertising market is increasing.

A Jana Partners spokesman said the company did not have a comment yet on the CBS bid.

CNet recently reported a narrower first-quarter loss and said revenue grew by 2.6 percent to $91.4 million.

CNet shares jumped $3.46, or 43.5 percent, to $11.40 in morning trading Thursday while CBS shares fell 97 cents, or nearly 4 percent, to $23.85.