Single-family new house construction building permits: 1  2003: 20 buildings, average cost: $97,500. 2  2004: 42 buildings, average cost: $77,300. 3  2005: 35 buildings, average cost: $88,800. 4  2006: 8 buildings, average cost: $83,600. 5  2007: 15 buildings, average cost: $93,100. 6  2008: 20 buildings, average cost: $89,000.
Fortune has learned some early Uber shareholders did sell stock back to the company earlier this year, including at least one at around the aforementioned $135 per share price (which works out to a valuation just south of $4 billion).
According to the latest valuation by the Wall Street Journal, Uberâs worth has now risen to $51 billion, securing its spot as the most valuable start-up in the world. Xiaomi follows in a close second with $46 billion, and Airbnb with $25 billion. Below youâll find a chart of the 10 most valuable start-ups in the world.