The share price is up big, but Quantum Computing is still a highly speculative investment.Interest in quantum computing stocks has ramped up in 2024 and 2025, and many of the industry's big players have seen their share prices soar. One of the best performers is Quantum Computing (QUBT 23.22%), which is sitting on one-year gains of over 2,800% as of Oct 1.That rapid growth has taken Quantum Computing, also known as QCi, from a micro-cap stock worth about $60 million to a mid cap worth nearly $3 billion. Cou ...