Following the end of each calendar quarter, institutional investors managing over $100 million in stocks have 45 days to file a form 13F with the Securities and Exchange Commission (SEC). This disclosure provides a detailed snapshot of the “smart money” on Wall Street — revealing which stocks major investors bought and sold during the most recent quarter.

According to recent 13F data, several billionaires have been trimming their stakes in data analytics platform Palantir Technologies (PLTR 0.11%) while reallocating capital toward semiconductor powerhouse Nvidia (NVDA 0.86%).

Let’s take a closer look at who’s making these moves in artificial intelligence (AI) stocks, what might be motivating them, and which company could be the better long-term buy.

Which billionaires are selling Palantir stock?

Below is a look at some of the prominent investors who pared back their exposure to Palantir in recent quarters.

• Citadel is a multi-strategy hedge fund that was founded by billionaire Ken Griffin. During the second quarter, the company offloaded 639,935 shares of Palantir, reducing its position by 48%. Interestingly, Citadel also holds both put and call options on the stock — suggesting that its Palantir strategy is less a simple exit and more a tactically hedged position within a broader, sophisticated trading framework.
• Stanley Druckenmiller is a legend on Wall Street, perhaps best known for his tenure managing money for George Soros before turning his focus to his own capital through the Duquesne Family Office. At the start of 2024, Duquesne held 769,965 shares of Palantir. But nearly a year later, the company had fully exited its position. This move wasn’t entirely unexpected. Duquesne has a history of trading Palantir opportunistically, adding or trimming exposure in step with the stock’s sharp volatility.
• Ray Dalio, the billionaire founder of Bridgewater Associates, has taken a similar approach to that of Duquesne. Throughout 2024, Bridgewater’s trading activity in Palantir followed a pattern of cautious trimming and rebalancing. By the first quarter of 2025, however, it had dumped its remaining position — and, as of now, has not reinitiated a stake in the stock.

Which billionaires are buying Nvidia stock after its generational rally?

Between the public debut of OpenAI on Nov. 30, 2022, and Nvidia’s most recent stock split on June 10, 2024, shares of the chipmaker soared by 620%. Nvidia isn’t merely a beneficiary of the AI revolution — it has become the yardstick by which the entire megatrend is measured.

NVDA data by YCharts.

The rally hasn’t stopped there. Since the split, Nvidia’s stock has climbed another 55% as of this writing (Oct. 13). While it might be tempting to assume that such momentum can’t last much longer, several notable billionaires appear to see things differently:

• During the second quarter, Coatue Management — the hedge fund founded by Philippe Laffont — boosted its position in Nvidia by 34%, adding 2,942,694 shares to its holdings.
• Griffin’s Citadel took an even more aggressive stance, purchasing 6,513,348 shares and increasing its stake by an impressive 414%.

Palantir vs. Nvidia: Which AI stock is the better buy?

When considering why some billionaires may be rotating out of Palantir and doubling down on Nvidia, one explanation stands out: Valuation.

NVDA PS Ratio data by YCharts.

As shown in the chart above, Nvidia currently trades at a price-to-sales (P/S) ratio of 28 and a forward price-to-earnings (P/E) multiple of 42.

While the company’s market capitalization has surged to record highs — making it the most valuable company in the world — its valuation multiples have actually moderated. In other words, both its current P/S and forward earnings ratios sit below the peaks reached earlier during the AI revolution.

These same dynamics do not apply to Palantir. As the figures above illustrate, Palantir’s valuation multiples have continued to expand, suggesting that investors are now pricing the stock to perfection amid increasingly bullish growth expectations.

For sophisticated investors like Laffont and Griffin, these trends likely represent an opportunity. They appear to be betting that continued investment in AI infrastructure, along with new trillion-dollar opportunities in fields like robotics, autonomous systems, and even crypto, have yet to be fully reflected in Nvidia’s share price — leaving meaningful upside potential from current levels. In my eyes, savvy investors are choosing to lock in profits and rotate their capital into more reasonably valued assets.

While I think Palantir stands to benefit from broader AI-driven tailwinds, its current valuation profile looks frothy at best and unsustainable at worst. For this reason, I see Nvidia as the better buy over Palantir right now.