The US stock market welcomed the strong performance of two new stocks this week.On Tuesday Eastern Time, the highly anticipated AI cloud computing company CoreWeave saw its stock price rebound over 25% during intraday trading, attempting to recover from the shadow of its initial public offering (IPO) price drop. Meanwhile, another digital media company, Newsmax, surged more than 12 times within two days of its listing, reminiscent of the "retail investor rally" phenomenon.CoreWeave: The largest tech IPO in the US in nearly three years, debut falls short of expectationsCoreWeave officially landed on NASDAQ last Friday, becoming the largest venture capital-backed tech IPO in the US since 2021.The company's main business is leasing NVIDIA GPU computing power resources to other tech companies, with Microsoft as its largest client. The IPO price was set at $40, lower than the originally planned range of $47 to $55, and the offering size was reduced from the initial plan of 49 million shares to 37.5 million shares.In the context of macroeconomic uncertainty and Trump's renewed tariff policies, CoreWeave CEO Mike Intrator told CNBC that the company adjusted the scale and structure of the offering based on actual buyer interest.However, despite market expectations for its AI infrastructure concept, the stock opened at $39 on its first day, slightly below the $40 offering price, and at one point fell over 6%, ultimately closing flat.Entering Monday of this week, CoreWeave fell again by over 10%, briefly dipping below the offering price, further undermining investor confidence. But on Tuesday, the stock rebounded strongly, with intraday gains exceeding 25%, and the stock price reaching $46.46, pushing its market capitalization above $20 billion.According to its prospectus submitted in March, the company saw revenue growth of over 737% last year, reaching $1.92 billion, but still recorded a net loss of $863 million. Its main competitors include Microsoft, Amazon, Google, and Oracle.Newsmax: First-day surge of 735%, two-day explosion of 1245%Another newly listed company, Newsmax, officially entered the US stock market on Monday, closing its first day up as much as 735%, and was temporarily suspended multiple times due to trading heat. On Tuesday Eastern Time, the stock surged again by over 132%, with the price hitting $193.79, expanding its market capitalization to nearly $25 billion. On March 31, the stock had dropped to $14.00 on its first day of the US IPO, meaning that since its listing on Monday, the stock's volatility reached 1245%.This wave of rising prices recalls the "meme stock frenzy" of 2020 to 2021, when stocks like GameStop and AMC surged in the short term driven by retail investor power, far exceeding fundamental valuationsBloomberg data shows that Newsmax's revenue last year was only $171 million, which means its price-to-sales ratio exceeds 85 times, far surpassing the valuation levels of GameStop and AMC Theatres at their peak.However, the extreme rise of the stock also reminds investors to be cautious of risks. Data shows that in the past five years, only 7 new stocks in the U.S. market saw an increase of over 700% on their first day of trading, but these companies subsequently experienced an average price pullback of 94%, with peak declines even approaching 99%