Yahoo's $8 Billion Black Hole - Bloomberg Businessweek

From a stark Yahoo reality check

"Think of Yahoo as a traditional enterprise (with all the assets just mentioned) stuck on top of a small safe deposit box. Inside that box: a huge pile of cash, plus stock certificates of two Asian tech companies. Yahoo owns about 15 percent of Internet giant Alibaba, a stake that would trade on the open market for roughly $29 billion. It also has a 36 percent holding (worth about $9 billion) in Yahoo! Japan, a publicly traded company based in Tokyo that long ago abandoned Yahoo’s search technology for Google’s. If you add up the cash and the stocks, you’ll notice that the value of the contents of the box totals $43 billion. That’s $8 billion more than the market capitalization of Yahoo, $35 billion, which includes the company and the stuff in that imaginary box. The implication: Everything you think of as Yahoo—apps, websites, employees, computers, buildings—has a negative value.
A more charitable analysis, where one imagines Yahoo selling its stock and paying the full corporate tax rate, yields a depressing result: Its operating business might be worth $6 billion."

Yahoo's $8 Billion Black Hole - Bloomberg Businessweek