This is a difficult question to answer as it depends on a number of factors, including what you define as a fintech company and what criteria you use to judge them. However, here are a few fintech companies that are often considered to be leaders in the space:
-SoFi: A personal finance company that offers student loan refinancing, mortgages, and other financial products.
-Betterment: An investment company that offers automated investing and financial advice.
-Acorns: A micro-investing app that allows users to invest spare change from purchases into a diversified portfolio.
-Coinbase: A digital currency exchange that allows users to buy and sell cryptocurrencies.
-Stripe: A payments company that provides infrastructure for businesses to accept online payments.