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28 September 2026

What AMD’s surge, Buffett’s caution and CarMax’s rise mean for markets

AMD’s 9% jump, Buffett’s caution on lofty returns, and CarMax’s 48% rally underline shifting market dynamics.

What AMD’s surge, Buffett’s caution and CarMax’s rise mean for markets

On a bustling Monday, three distinct stories reshaped the narrative of today’s equity markets. Advanced Micro Devices (AMD) surged more than nine percent as demand for its compute solutions intensified, veteran investor Warren Buffett reminded the world of the perils of unrealistic return expectations, and used-car giant CarMax logged a 48-percent year-to-date gain after a leadership change. Together, they offer a snapshot of the forces steering technology, valuation sentiment and consumer-auto trends.

AMD’s compute boom fuels a double-digit rally

The chipmaker’s shares climbed to $610.42, driven largely by a resurgence in data-center spending. Heavy-weight workloads emerging from platforms such as Meta’s Muse require not only graphics processing but also the general-purpose compute power that AMD’s EPYC CPUs and Instinct accelerators deliver. In the most recent quarter, AMD’s data-center revenue doubled to $6.7 billion, marking a 107 % year-over-year increase and lifting total company revenue by half to $11.5 billion.

Cloud provider Nebius underscored the trend by raising prices for AMD EPYC Genoa capacity by 25%, a move that reflects tightening supply and robust demand. The price hike, paired with parallel increases for Nvidia GPUs, highlights the central role of CPUs in coordinating applications, moving data and supporting accelerator-heavy tasks. Analyst Forrest Norrod points out that AMD’s “full-stack” strategy—combining processors, accelerators, networking and software—positions the firm to capture a broader slice of the expanding compute budget.

Looking ahead, rumors of a next-generation gaming GPU scheduled for 2027 could give AMD a temporal edge if rivals delay their launches. However, the stock now trades at more than twice the value suggested by conservative fair-value models, meaning future appreciation hinges on sustained deployment growth.

Buffett’s reminder about inflated return expectations

In his 1999 shareholder letter, Warren Buffett warned that investors were becoming “wildly optimistic” about the next decade’s equity returns. A Gallup poll quoted in his 2000 missive showed that the average investor expected a 19 % annual gain—far above the historical long-term average of roughly 10 % for the S&P 500.

Those lofty expectations were forged during a period when the index posted gains of 34 % in 1995, 20 % in 1996, 31 % in 1997, 27 % in 1998 and 20 % in 1999. The subsequent tech-bubble collapse brutally corrected the optimism, proving Buffett’s cautionary note. Today, while markets are not repeating the exact conditions of the late 1990s, the lesson remains relevant: basing portfolio projections on unusually high historical returns can lead to under-saving and misplaced risk.

Buffett advises investors to anchor asset allocation to their time horizon and risk tolerance, avoiding drastic shifts such as moving from full-equity exposure to cash simply because valuations appear lofty. The core message is not to shun equities, but to keep enthusiasm in check with disciplined, realistic expectations.

CarMax’s resurgence under new leadership

Used-car retailer CarMax has outperformed the broader market, delivering a 48 % gain in 2026 versus the S&P 500’s 13 % rise. The turnaround follows the appointment of former executive Keith Barr as CEO in February, after the previous chief was dismissed amid weakening sales.

Analysts anticipate Barr will elaborate on a four-pillar strategy during the upcoming earnings call, while recent figures show Q2 profit up nearly 12 % and revenue up 6.7 % year-over-year. Nevertheless, the macro backdrop is less forgiving: higher Federal Reserve rates, elevated fuel prices and a cautious consumer base pressure auto financing and spending.

Comparatively, peers such as Carvana, AutoNation and Group 1 Automotive have posted double-digit declines, making CarMax’s performance stand out, albeit at a forward price-to-earnings multiple of about 19—roughly double its 2025 low and higher than even some high-growth tech stocks. The coming weeks will reveal whether the rally reflects a structural shift in the used-car market or a short-term cycle boost.

Investors monitoring these developments should weigh AMD’s expanding compute portfolio against its premium valuation, keep Buffett’s warning in mind when modeling future returns, and scrutinize CarMax’s ability to sustain growth amid a tightening credit environment.

Author

Ryan Bennett