NEW YORK – Uber is eyeing a valuation above $100 billion for its much-anticipated share offering due in 2019, which would be the biggest-ever in the tech sector, sources familiar with the plan said Tuesday. The sources told AFP the global ride-sharing giant is considering speeding up its plans for an initial public offering (IPO) to the first half of 2019, rather than the second half of the year. Uber, which operates in over 60 countries, is already the largest of the venture-backed "unicorns" valued at more than $1 billion, which until recently was considered rare without tapping stock markets. Its most recent investment -- a $500 million injection from Japanese auto giant Toyota -- was made at a reported valuation of $72 billion. Earlier Tuesday, the Wall Street Journal reported that bankers were proposing a valuation as high as $120 billion for Uber, which has been a disruptive force in many cities where regulators and taxi operators have challenged its business model.