Ackman bets on Microsoft AI — is Mastercard the smarter play?

Bill Ackman boosted his Microsoft stake nearly 10% in Q2 2026, yet analysts say the AI stock is fairly priced—not a bargain. His simultaneous Visa and Mastercard bets signal a broader fintech thesis: dominant payment networks trading near fair value may offer steadier upside than chasing Microsoft after its post-earnings surge.

Billionaire hedge fund manager Bill Ackman just completed one of his biggest portfolio overhauls in years. Pershing Square Capital Management added Netflix, Visa, and Mastercard while increasing its Microsoft position, according to its June 30, 2026 13-F filing. For investors tracking fintech and crypto alerts, the dual bet on AI and payments is the story worth watching.

Key Takeaways

• Ackman's Pershing Square raised its Microsoft stake ~10% in Q2, making it the fund's third-largest holding at roughly 12% of the portfolio.
• Microsoft shares surged after July earnings, lifting its forward P/E from under 20 to about 25—fair, but no longer a deep discount.
• Visa and Mastercard joined the portfolio at ~$1.1 billion each, alongside new Netflix exposure of $934 million.
• Both payment giants trade near fair value with strong 15-year track records, though crypto competition and regulation remain risks.
• Ackman's fund has returned ~16% annually since 2004 versus the market's ~10–11%.

What Did Bill Ackman Change in His Portfolio?

Ackman runs a highly concentrated fund—just 14 holdings as of June 30. Uber ranked first at $2.5 billion, with Microsoft third at $2.3 billion. Amazon, Howard Hughes Holdings, and Meta Platforms rounded out the top tier.

The notable newcomers were Netflix ($934 million), Visa ($1.1 billion), and Mastercard ($1.1 billion). Ackman, whose net worth Forbes recently pegged at $8.9 billion, has averaged roughly 16% annual gains since Pershing Square's 2004 launch—well above the stock market's long-term average.

Is Microsoft Still the Best AI Buy Today?

Microsoft has been a flat investment in 2026 while the S&P 500 returned more than 10%. Buyers who entered at June's lows are up about 30%, but the easy money may have passed.

July earnings changed the calculus. Microsoft reported 18% revenue and operating income growth, with Azure cloud revenue up 43%. Crucially, it did not raise data-center spending guidance—unlike other AI hyperscalers—sending shares sharply higher.

Before earnings, Microsoft traded below 20 times forward earnings. It now sits near 25 times—cheaper than its historical ~30 times, but fair for a company growing below 20% year over year. Analysts call it a solid hold, not today's top AI bargain.

Why Did Ackman Add Visa and Mastercard?

Ackman favors dominant companies at fair or low prices. Visa trades at a P/E of 33, near its five-year average of 32, and is up 17% over the past year. Mastercard's P/E of 33 sits below its five-year average of 37; the stock gained just 1.6% over the same period.

Both payment networks have averaged nearly 22% annual gains over 15 years. As more commerce moves digital, Visa and Mastercard remain entrenched—though crypto adoption and antitrust scrutiny pose long-term threats. For investors weighing Ackman's moves, The Motley Fool's portfolio breakdown offers the full holdings table.

Should Investors Follow Ackman Into Fintech?

Ackman's Microsoft buy reflects confidence in Azure's AI cloud growth, but timing matters. The stock's post-earnings rally removed the discount that made it attractive in April and June.

Mastercard and Visa offer a different angle: steady compounders in global payments rather than pure-play AI hype. Whether that mix outperforms depends on your risk tolerance—but Ackman's biggest overhaul in years makes clear he is not betting on a single theme.