Bill Ackman Bought Microsoft on a 20% Slide. Is the $384 Rebound Still a Buy?

Ackman bought weakness; the post-earnings move changed the setup

Microsoft still looks compelling, but buying the rebound is a different trade from buying the panic. Ackman bought weakness when Microsoft had fallen about 20% and was trading around $392, well below its 200-day moving average. At that point, the market seemed to be pricing durable fears about Azure and Microsoft's AI competitiveness into a business that was still delivering strong results.

After earnings, the stock's reaction showed how quickly sentiment can reverse. Microsoft added nearly $500 billion in market value in a single session, a sign that investors were willing to reward the company for proving that demand remained intact. The operating evidence backed that shift: Microsoft's AI business is at a $37 billion annual run rate, up sharply from a year earlier, while the market's main objection has been spending anxiety rather than weak customer demand.

Pershing Square's trade matters because it was built on that earlier fear. The fund built the position to roughly $2.4 billion by the end of May, buying into weakness rather than after the crowd re-rated the shares. After a rebound of this size, the risk-reward is no longer about whether Microsoft is a high-quality business. It is about whether the stock can hold its rerating after the immediate relief has faded.

Why the capex scare was rational - and why it may have been amplified

The capex concern was understandable

Microsoft told investors to expect more than $40 billion in capital spending for the quarter, with about two-thirds going to GPUs and other short-lived hardware. That is the kind of spending plan that scares investors because the payoff is uncertain in the short run. If AI demand disappoints, the market can quickly view the buildout as excessive.

That concern was amplified by competitive pressure. Microsoft is not building in a vacuum; competitive pressures from Amazon and Google mean cloud and AI leadership are not guaranteed. Just before the quarter, Wall Street was looking for about $87.7 billion in revenue and $4.24 per share, right at the top of Microsoft's own $86.7 billion to $87.8 billion guidance range. In that context, investors had reason to demand near-flawless execution.

The results gave the rebound substance

Microsoft did more than simply avoid a miss. In the prior quarter, revenue was $82.9 billion and increased 18%, while net income increased 23% and EPS increased 23%. The next report provided an even clearer signal: Azure revenue rose 43%, Azure revenue surpassed $100 billion for the first time, and Microsoft 365 Copilot reached over 30 million paid seats.

That combination matters. Microsoft had already shown an AI business at a $37 billion annual revenue run rate, and the later figures suggested monetization was showing up across the platform, not only in infrastructure spending. That helps explain why the market was willing to add nearly $500 billion in market value in a day after earnings. The rebound was not purely emotional; it had operating support.

At roughly $384, Microsoft looks priced for execution rather than despair

At roughly $384, Microsoft still trades at about 23x trailing earnings and 20x forward earnings despite 23.4% earnings growth, 18.3% revenue growth, Azure up 40%, and Microsoft Cloud revenue of $54.5 billion, up 29%. That is not the valuation of a broken business, but it also leaves less room for mistakes.

The core question for investors now is simpler: can Microsoft keep converting AI demand into cloud growth, platform adoption, and profitable execution? If the answer remains yes, the stock can still work from here. If spending keeps rising faster than visible monetization, the market may once again punish the stock before the fundamentals do.