2018 Disruptor 50: No. 31 Houzz By: CNBC.com News May 22, 2018 at 06:00 AM EDT Houzz says it has more than 40 million monthly unique users and 1.5 million active home-renovation and design pros using its site. Its valuation: around $4 billion. Read More >> Related Stocks: Atyr Pharma Inc