Television and radio station operator CBS Corp. said it acquired 78 percent of CNET shares, making the Web site operator a majority-owned subsidiary.
CBS bought the shares for $11.50 apiece as part of its effort to buy San Francisco-based CNet, which provides technology, food and entertainment information through its CNet.com Web site and other consumer information sites.
CBS said it has started a second tender offer to buy the remaining shares. That offer expires at midnight on Wednesday.