Billionaire Stanley Druckenmiller Sells Micron and Is Piling Into This Other Unstoppable Artificial Intelligence (AI) Chip Stock Instead

As a former top lieutenant to George Soros, Stanley Druckenmiller has built a reputation for delivering big long-term returns through disciplined macro analysis. His primary investment vehicle today is the Duquesne Family Office, which manages a portfolio spanning technology, healthcare, and select cyclical themes.

Investors watch his moves closely because his track record and bold willingness to rotate positions decisively have often preceded major market shifts. The firm's latest 13F filing shows one such rotation: During the second quarter, Duquesne fully exited its position in Micron Technology (NASDAQ: MU) while initiating a new stake in Advanced Micro Devices (NASDAQ: AMD).

Stanley Druckenmiller. Image source: Getty Images.

Why sell Micron stock now?

Micron designs and manufactures advanced memory and storage solutions, including high bandwidth memory (HMB), DRAM, and NAND, that sit at the heart of artificial intelligence (AI) servers. Memory solutions feed data to graphics processing units (GPUs), keeping large language models (LLMs) running efficiently.

Throughout 2026, Micron stock has staged one of the market's most dramatic rallies -- rising 231% and achieving a trillion-dollar market capitalization. Such parabolic ascents often prompt seasoned money managers to take profits. Druckenmiller's complete exit from Micron may signal a view that memory is a more cyclical, capacity-driven segment of the broader AI chip stack.

While HBM demand is real, supply responses could arrive faster relative to next-generation specialized processors designed by AMD. In turn, this could potentially cap further valuation expansion for Micron if growth decelerates. By stepping away after the initial surge, Druckenmiller appears to be treating pure-play memory producers as a trade that is reaching maturity, rather than a multi-year compounder within the AI infrastructure landscape.

The case for buying AMD stock right now

A few years ago, Druckenmiller had built and subsequently fully sold a position in Nvidia. He later acknowledged that the exit was a "big mistake" as he left substantial gains on the table. I think this experience may partially explain the fresh interest in AMD, as the company is Nvidia's closest peer and still scaling the AI adoption curve.

AMD's Instinct accelerators and EPYC server processors are gaining respectable market share as hyperscalers diversify their capex budgets beyond Nvidia's processors. Nevertheless, AMD stock has not yet commanded the same dominant narrative that was once reserved for Nvidia.

During Q2, the company generated revenue of $11.5 billion, up 50% year over year. Meanwhile, AMD's data center segment more than doubled to $6.7 billion and accounted for nearly 60% of total sales. What's most encouraging is that management guided for continued acceleration into the second half of the year as AMD continues to onboard hyperscaler demand.

Should you follow Druckenmiller's lead and buy AMD stock?

AMD stock has already delivered an impressive performance this year, advancing more than 120%. At current levels, AMD trades at a forward price-to-earnings multiple (P/E) of around 63. To put that into context, the broader semiconductor industry boasts a forward P/E of around 26.

AMD PE Ratio (Forward) data by YCharts.

AMD's valuation clearly embeds optimistic expectations for aggressive AI-driven growth and profit margin expansion. Whether its premium is justified will depend on management's execution, measured by market share gains against Nvidia, successful product ramps, and capitalizing on the secular tailwinds supported by accelerating AI infrastructure spending.

For most investors, the prudent path is not simply mimicking Druckenmiller's decisions. Retail investors are best served by weighing AMD's strong fundamentals and competitive momentum against the risk that its elevated valuation leaves little margin for error.

I think building a modest position in AMD alongside a diversified basket of technology stocks, coupled with monitoring the company's quarterly progress, offers a balanced way to participate in the upside rather than simply copying one billionaire's latest filing.

Adam Spatacco has positions in Nvidia. The Motley Fool has positions in and recommends Advanced Micro Devices, Micron Technology, and Nvidia. The Motley Fool has a disclosure policy.