WP Engine has closed $15 million in funding to help with product development led by North Bridge Growth Equity. WP Engine has tens of thousands of customers. WP Engine is a WordPress hosting service that has very reliable uptime and fast servers. WordPress is the largest self-hosted blog platform with over 74 million websites supported. WP Engine has free and paid hosting options. Large customers generally require more support from WP Engine so they pay for premium services. WP Engine receives around 36 million unique visitors per day, which is up from 20 million in October. Some of WP Engine’s customers include New Relic, SoundCloud, Foursquare, and Gap.