Can you invest in fusion?

I'm curious, can you actually invest in fusion as a form of energy production or technology? I've heard about the potential benefits of nuclear fusion, but I'm not sure if there's a direct way for individuals or investors to get involved. Is there a stock market for fusion-related companies, or are there other avenues for investing in this exciting field? I'd love to learn more about the opportunities, if any, that exist for those looking to support and profit from the advancement of fusion technology.