Each year Andreessen Horowitz publishes the Marketplace 100, a ranking of the biggest marketplace startups from around the world. 

Using transaction data from Bloomberg Second Measure, they rank winners according to gross merchandise value (GMV) — the total amount of money users spend on their platform.

2020 was an interesting year for marketplace startups, with some (like food delivery) thriving amid the COVID-19 lockdowns while others (like event tickets or travel marketplaces) floundered.