Russian Internet company Yandex, which operates the largest search engine in Russia, raised the estimated price range for its IPO to $24 - $25, from an earlier estimate of $20 - $22, an unnamed source was quoted as saying in a Reuters report.The increase reflected strong investor demand in the wake of LinkedIn Corp’s (NYSE:LNKD) blowout debut last week on the New York Stock Exchange (NYSE:NYX).At the top end of that range, the company could raise $1.4 billion if lead managers exercise their over-allotment option, which would be the largest float by an Internet company since Google (NASDAQ:GOOG) raised $1.67 billion in 2004.Yandex would be worth between $7.3 billion and $7.6 billion before accounting for the newly raised money, based on its 303.8 million shares outstanding.Yandex controls 65% of the Russian market for Internet search, is that country's No. 1 most popular website, and is ranked 8th in the world for search. It had revenues last year of $445 million, up 43% year-over-year, and profited $135 million, up 90% from the year prior.Morgan Stanley (NYSE:MS), Deutsche Bank (NYSE:DB) and Goldman Sachs (NYSE:GS) are the lead underwriters for the offering.The company will being trading tomorrow, May 24th, on the Nasdaq Stock Market under the symbol "YNDX."