2/24/2018 S-1 Table of Contents Moreover, as we continue to innovate and optimize our go­to­market strategy, we have successfully increased monetization for subsequent cohorts. Comparing January cohorts from the last three years, at virtually every point in time after signup, the January 2017 cohort generated a higher monthly subscription amount than the January 2016 cohort, which in turn generated a higher monthly subscription amount than the January 2015 cohort. Our Global, Diversified Customer Base The growing need for a unified home for content and the viral nature of our business have allowed us to scale globally. We have paying users across 180 countries, and we generated approximately half of our revenue in 2017 from customers outside the United States. Our customer base is highly diversified, and in the periods presented, no customer accounted for more than 1% of our revenue. Our customers include individuals, teams, and organizations of all sizes, from freelancers and small businesses to Fortune 100 companies. They work across a wide range of industries, including professional services, technology, media, education, industrials, consumer and retail, and financial services. Within companies, our platform is used by all types of teams and functions, including sales, marketing, product, design, engineering, finance, legal, and human resources. 63 https://www.sec.gov/Archives/edgar/data/1467623/000119312518055809/d451946ds1.htm 71/235