Reuters: Yahoo announced it is looking at cashing in its stake in Yahoo Japan, which could be worth almost $9 billion before tax. The news boosted Yahoo’s stock price. The Internet company has hired advisers to help it evaluate options for the stake, said CEO Marissa Mayer. Investors have been urging Mayer to monetize the Yahoo Japan stake separately, after she announced plans to spin off the Alibaba stake in January, which could be worth $40 billion. The advisers will help Yahoo “determine the most promising opportunities to maximize value” for the Yahoo Japan stake, said Mayer.