This fintech stock has been on a tear, climbing 66% so far in 2025.The U.S. is the world's largest economy. So, it makes sense that investors searching for lucrative opportunities would focus on this country. However, there are also some wonderful businesses with a presence in other parts of the world. Nu Holdings (NU 0.60%) is one of them. It's a financial services innovator that has reached a market cap of $84 billion (as of Dec. 5). Investors should be paying attention, as this business might make for an ...