<p>China&rsquo;s sovereign wealth fund bought a stake in Airbnb through its latest funding round, which valued the home-sharing startup at $31 billion.</p> <p>The state-backed China Investment Corporation contributed 10 percent to the latest $1 billion funding round, according to a filing with U.S. securities regulators cited by Sky News.</p> <p>CIC, which owns stakes in companies such as Heathrow Airport Holdings and London&rsquo;s private Thames Water utility, is one of 40 investors in the San Francisco company&rsquo;s&nbsp;latest round.</p>