Jeremy Siegel, a renowned finance professor from the University of Pennsylvania’s Wharton School, has raised a red flag over the soaring valuations of technology stocks, particularly NVIDIA Corp (NASDAQ:NVDA). What Happened: Siegel, also known as the “Wizard of Wharton,” cautioned that the current enthusiasm for tech stocks, including Nvidia, might be a sign of an impending bubble, reported Business Insider. “The beginnings of a speculative bubble may be forming but it is impossible to tell when it will end,” Siegel said in his weekly WisdomTree commentary on Monday. He noted that Nvidia’s sto…