It was a recent story that NVIDIA furiously raised it and went so far as to split it.
It is also called the AI stock boom, and while various things are being bought as AI-related, starting with semiconductor stocks, I think stocks that have recently shown a sharp rise in US small-cap stocks are the next hit stocks.　
However, I don't think this AI stock boom will last long because it always feels like a Tesla bubble or leveraged ETF bubble.
It's personal nonsense, so maybe it's better to just listen to half of the story.