LOS ANGELES -- EBay (NASDAQ: EBAY), the world's largest online auctioneer, sued Craigslist, a competitor in which it holds an ownership stake, in a dispute over whether the Internet bulletin board tried to blunt eBay's control.

EBay alleged in the lawsuit that the board of directors of Craigslist, the Web's dominant classifieds listing service, took "unilateral actions" to dilute eBay's 28.4 percent stake by more than 10 percent, eBay said in a statement.

The suit, filed on Tuesday under seal, asked a Delaware Chancery Court to rescind the unspecified actions to protect eBay's stockholders and preserve its stake in Craigslist.

The suit names as defendants Craigslist founder, Craig Newmark, who runs the company in a famously open-minded style, and Chief Executive Jim Buckmaster. Newmark and Buckmaster are the only members of Craigslist's board of directors.

EBay bought a minority ownership stake in 2004, and launched its own free online classifieds site, called Kijiji, three years later in the United States.

The two services directly compete in the United States and about a dozen countries, with Kijiji tailoring its ads to young families rather than maintaining a Craigslist-style open marketplace.

In an email, Newmark had no comment on the lawsuit, or on whether the dispute involved the companies' business rivalry, saying Craigslist needed "a little time to figure it all out."

An eBay spokeswoman said the disputed board actions concerned "corporate governance issues" and did not involve Kijiji.

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She said eBay could reveal no more about its complaint without Craigslist's permission to protect information about privately held Craigslist governed by confidentiality restrictions.

Shares of eBay closed up 26 cents at $30.89 Tuesday on Nasdaq.

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