How Palantir, a favorite in AI, turned into the S&P 500’s top and bottom stock of 2025, rising 144% before losing value for six consecutive sessions

Palantir Technologies’ Rollercoaster Year

This year has been quite a journey for Palantir Technologies, presenting one of the most compelling narratives on Wall Street. By 2025, it emerged as the leading stock in the S&P 500, experiencing a remarkable surge of over 106%, hitting a peak of 144% since the year’s start. This growth, fueled by the company’s solid financials, also marked its first billion-dollar quarter as it garnered momentum from both government and commercial AI contracts.

However, this meteoric rise was followed by a sharp decline. In just six trading sessions, Palantir’s shares took a nosedive, erasing more than 17% of its market cap—the steepest drop since April. This downturn translated to $1.6 billion lost in market capitalization, as reported by S3 Partners, although this still pales in comparison to the $4.5 billion paper loss that short sellers reportedly faced earlier in the year. Recently, Palantir has found itself labeled as one of the worst performers in the S&P 500, highlighting its drastic fall from grace.

Palantir’s stock movements have drawn scrutiny, particularly from short sellers like Citron Research, led by Andrew Left. In a harsh critique, Citron claimed that Palantir’s stock value has diverged significantly from its business fundamentals. Their report famously included a satirical characterization of CEO Alex Karp, raising questions about the company’s valuation.

Citron’s analysis suggested an inflated price-to-sales ratio for Palantir in comparison to AI leader OpenAI, which is eyeing a valuation of $500 billion by 2026. While OpenAI forecasts a revenue of $29.6 billion, Citron pointed out that Palantir’s revenue model—largely dependent on government contracts—could hinder scalability compared to OpenAI’s subscription-based approach. This, they argue, renders Palantir’s stock far more expensive than it should be, despite recent losses.

The report posited that Palantir lacks the growth momentum that other companies, like OpenAI, seem to possess, branding the company more like a defense contractor with less sustainable growth prospects. While Palantir does boast impressive, stable revenue growth, Citron emphasized a growing disparity between its valuation and its underlying business strength.

Ultimately, Palantir’s saga this year serves as a striking example of market highs and lows, propelled by excitement over AI. However, it also serves as a reminder of how quickly fortunes can change—momentum can vanish, leaving investors wary, especially given critical evaluations that expose gaps between stock prices and real-world performance.

The current climate remains paradoxically volatile, as some anticipate a rebound for Palantir. Investors are keenly watching for future revenues, contract renewals, and the sustainability of growth strategies. This volatility paints Palantir as a stock exemplifying both peaks and troughs at the same time.

Meanwhile, broader discussions have surfaced regarding the viability of AI investments. Some reports indicate that despite substantial funding, many generative AI initiatives are struggling, with around 95% of pilot projects reportedly failing.

Even Sam Altman, CEO of OpenAI, stirred the pot by suggesting that the AI market might be in a bubble. Citron noted this declaration, asserting that it reflects the reality many are unwilling to face.