The owner of Quora is Adam D'Angelo and is also the founder of Quora.
Adam D'Angelo is also the major shareholder of Quora.
According to crunchbase Quora also has 11 investors with $141 million in equity investment.
The investors in Round A,B & C represent approximately 30% of the ownership.
The 100+ employees probably have stock options and some ownership.
Quora makes quite a bit of money through ad sales and is a highly profitable website and gets a lot of search and website traffic.