CNBC's Jim Cramer urges investors to cash out of speculative stocks. "It's a good time to ring the register" on high-risk companies, said Cramer on " Squawk on the Street " on Thursday morning. "I just called a top in speculation because I can't take it anymore." Cramer has become critical of the cohorts in categories like nuclear, quantum computing, flying car developers, and even some health care stocks. Instead, he wants investors to focus on quality, profitable names — such as Nvidia , for example — over unprofitable organizations with massive growth in short periods. We have so many stocks that are up 200% or 300% that we just have to say 'Listen, those are going lower.' And, they should go lower because you should sell them," explained Cramer. His initial warning about speculative st

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