Is the AI Boom Creating a New Tech Bubble in Disguise?

Is the AI Boom Creating a New Tech Bubble in Disguise?

In an unexpected twist to the artificial intelligence revolution, some of the oldest and most traditional technology companies are becoming the biggest winners on Wall Street.

While investors typically focus on flashy AI startups and chip designers, it’s the humble data storage companies that are stealing the show in 2025.

Seagate Technology Holdings, the hard disk drive manufacturer, has surged 156% year-to-date, claiming the top spot among S&P 500 performers. Its rival Western Digital follows closely with a 137% gain, ranking third in the index. Memory semiconductor maker Micron Technology rounds out the top five with a 93% increase, following a record-breaking 12-day winning streak.

These companies were founded decades before tech luminaries Mark Zuckerberg and Sam Altman were even born, yet they’re now at the center of Wall Street’s AI frenzy. The surge represents a remarkable transformation for businesses that many investors once considered boring and outdated.

Is the AI Boom Creating a New Tech Bubble in Disguise?

From Mainframes to Machine Learning

The technology powering these gains has deep historical roots. Hard disk drives trace their origins to the 1950s, when IBM’s first commercial drive weighed over 900 kilograms and stored just 5 megabytes of data. Today’s drives pack up to 2 terabytes into devices weighing less than 700 grams, making them essential infrastructure for training large language models that require vast amounts of data storage.

Similarly, companies like Micron have evolved from producing basic memory chips to manufacturing high-bandwidth memory (HBM) that serves as a critical component in AI computations. Despite their technical importance, these firms rarely generate the same excitement as consumer-facing tech companies.

“When I talk about these stocks on the phone, I can hear people getting bored,” admits Kim Forrest, founder of Bokeh Capital Partners. “People want to hear about flying cars and robot dogs.”

Infrastructure Investment Drives Demand

The rally reflects the massive infrastructure investments being made by tech giants like Microsoft and Alphabet, which are spending tens of billions annually on semiconductors, networking equipment, data centers, and the electricity to power them. This spending spree has elevated companies across the AI supply chain, with semiconductor leaders like Nvidia and Taiwan Semiconductor Manufacturing Company reaching trillion-dollar market capitalizations.

The infrastructure boom has particularly benefited data storage companies, with Seagate doubling in value as it rolls out massive drives for data centers. The trend extends beyond storage to other traditional tech sectors, with power generation company Vistra gaining 53% this year after surges of 66% in 2023 and 258% in 2024.

Even established software companies are riding the wave. Oracle, the database giant, has climbed into the top 10 S&P 500 companies by market cap, driven by cloud demand. After a recent earnings announcement, Oracle’s shares jumped 36% in a single day, pushing its valuation to dot-com era levels.

Bubble Concerns Mount

The sudden success of these traditional tech companies has some market veterans worried about a potential bubble. Michael O’Rourke, chief market strategist at JonesTradingInstitutional Services and a former dot-com era trader, sees troubling parallels to past market peaks.

“This is typical bubble behavior,” O’Rourke warns. “When the leaders become expensive and money rotates to second and third-tier names, the market cycle is approaching its final phase.”

The valuation concerns are tangible – while all three major storage companies are now profitable, each has reported annual losses within the past three years. At the start of 2025, Western Digital traded at less than six times estimated profits, while Seagate and Micron were valued around 10 times earnings. These multiples have expanded rapidly as stock prices soared.

Wall Street Scrambles to Keep Up

The pace of gains has caught even Wall Street analysts off guard. Despite bullish sentiment toward Seagate, Western Digital, and Micron, analyst price targets haven’t kept pace with the rapid stock appreciation. Some market observers interpret this disconnect as a sign that investors may be approaching a profit-taking phase.

Forrest, despite holding Micron shares due to the company’s competitive advantages in memory markets, acknowledges the current situation feels overheated. She draws parallels to the early internet boom, suggesting that practical AI applications may take longer to develop than many investors expect.

The Long View

While bubble concerns grow, the fundamental drivers supporting these companies remain strong. The AI revolution continues to demand ever-greater computing and storage capacity, and the infrastructure build-out shows no signs of slowing. Whether the current rally represents sustainable growth or speculative excess may depend on how quickly AI applications translate into real-world productivity gains.

For now, the most boring companies in tech are having their moment in the spotlight – but as market history shows, moments like these can be both profitable and perilous for investors caught up in the excitement.