Billionaire investor Bill Ackman, the founder and CEO of Pershing Square Capital Management, has long been known for running a highly concentrated, ultra-selective portfolio. Pershing Square typically holds just 10 to 12 stocks at any given time, favoring deeply entrenched, predictable businesses with massive competitive moats.
Recently, Ackman turned his sights toward the crown jewels of Silicon Valley. He revealed that Pershing Square has systematically used episodic market sell-offs to build massive positions in four of the world’s most dominant “Magnificent Seven” tech giants: Alphabet ($GOOG), Amazon ($AMZN), Meta Platforms ($META), and Microsoft ($MSFT).
According to Ackman, these temporary market corrections have offered investors a rare gift: the opportunity to purchase “some of the most dominant long-term compounding franchises at attractive valuations.” He insists that despite their massive size, these specific stocks offer an “analogous and compelling long-term value at today’s valuation.”
Exploiting the Short-Term Flaws of the Modern Market
Ackman argues that structural shifts in how modern markets operate have created a breeding ground for mispricing—even among the most heavily scrutinized mega-cap stocks. He points to two main culprits behind these sharp, irrational sell-offs:
- The Rise of Passive Indexing: As more capital flows into blind index funds, a massive amount of equity ownership is detached from fundamental research. When the index moves, these stocks move violently regardless of their underlying business strength.
- Leveraged, Short-Term Investors: A vast portion of daily trading volume is controlled by institutional investors who use heavy leverage and have an incredibly low tolerance for short-term volatility. The moment a company reports a minor bump in the road, these players dump shares aggressively to protect their leverage, driving down stock prices well below fair value.
For a long-term, fundamental value investor like Ackman, this institutional impatience is the ultimate buying signal.
Anatomy of the Purchases: How Pershing Square Bought the Dips
Pershing Square didn’t buy these companies at their peaks; they waited for the market to throw a temper tantrum. Here is how Ackman capitalized on specific market overreactions:
1. Alphabet ($GOOG) – The ChatGPT Panic
In late 2022, OpenAI launched ChatGPT, triggering a wave of Wall Street panic that Google’s core search monopoly was dead. Alphabet’s stock plunged substantially as investors feared a swift disruption. Ackman stepped into the wreckage, recognizing that Google’s deeply integrated ecosystem, massive data advantages, and built-in AI capabilities meant the market was severely underestimating its resilience. (Note: While a core part of his historical tech playbook, recent regulatory filings indicate Ackman has shaved down this position to reallocate capital into newer tech opportunities).
2. Amazon ($AMZN) – The Post-“Liberation Day” Retraction
Following tech-sector pullbacks and internal cost-restructuring phases—often colloquially referenced as post-Liberation Day market dynamics—Amazon saw its valuation compressed relative to its massive cash-flow potential. Pershing Square bought into the e-commerce and cloud giant, betting on the long-term compounding power of its dual monopolies: digital retail dominance and Amazon Web Services (AWS).
3. Meta Platforms ($META) – The Capex Backlash
More recently, Meta shocked Wall Street by announcing unexpectedly massive capital expenditure (capex) guidance aimed aggressively at AI infrastructure. Worried about a repeat of the costly “Metaverse” cash-burn era, short-term investors aggressively dumped the stock. Ackman capitalized on this dip, believing the market failed to see that Meta’s AI spending would directly optimize its highly lucrative advertising engine and user engagement across Instagram, Facebook, and WhatsApp.
4. Microsoft ($MSFT) – The 2026 Core Allocation
The newest crown jewel in Ackman’s tech portfolio is Microsoft, which he revealed as a major new core holding for both his main hedge fund and his new closed-end fund, Pershing Square USA.
Microsoft suffered a steep correction early in the year, declining heavily following an earnings report that triggered anxiety regarding AI competition from Google and Amazon. Ackman accumulated shares as the stock fell, ultimately building a multi-billion-dollar position when Microsoft traded at roughly 21 times forward earnings—a valuation practically in line with the broader, slower-growing market multiple.
What the Market is Missing on Microsoft, According to Ackman:
- Commercial Monopolies: Microsoft 365 (Office) and Azure cloud infrastructure make up roughly 70% of the company’s earnings. With over 450 million Microsoft 365 subscribers, enterprise reliance on this software is virtually unshakeable.
- The Hidden Value of OpenAI: Ackman notes that the market is largely ignoring Microsoft’s massive 27% economic stake in OpenAI (the parent company of ChatGPT), an asset worth hundreds of billions of dollars on its own.
- The Copilot Growth Engine: Fears that AI alternatives will erode Microsoft’s market share are overblown; instead, the integration of Copilot AI into the enterprise workflow is poised to drive massive ARPU (Average Revenue Per User) expansion.
The Verdict: Long-Term Compounding Over Short-Term Noise
Bill Ackman’s aggressive push into Big Tech signals a profound evolution for the value investor, moving from traditional legacy brands to high-margin, digital monopolies.
By looking past the immediate anxieties surrounding AI capital expenditures, interest rate fluctuations, and quarterly guidance, Pershing Square has anchored itself to the digital infrastructure of the global economy. For everyday investors, Ackman’s strategy serves as a classic masterclass: when the market’s short-term horizon panics and sells off structural monopolies, the disciplined investor steps up to buy.