Who is leading in quantum computer?

In the race towards the development of quantum computing, who currently holds the frontrunner position? Are we seeing significant progress from established tech giants like Google, IBM, or Microsoft, or is it a smaller startup that's pioneering new technologies? What factors are determining who's ahead, such as the number of qubits, the stability of their systems, or the applications they've been able to demonstrate? And how are these advancements likely to impact the future of cryptocurrency and finance? Could quantum computing potentially render existing encryption methods obsolete, posing a significant threat to the security of digital assets?