Bitcoin rival Blockchain start-up Ripple built a digital payments network for real-time financial transactions.
It suddenly has billions of dollars worth of cryptocurrency on its balance sheet.
Ripple owns about 61 percent — or $16 billion worth — of XRP.
If that were factored into the company's valuation, Ripple would be worth more than all but four U.S. start-ups — Uber, Airbnb, Palantir and WeWork.