In a rare single-night sweep, Microsoft, Meta, and Alphabet all reported quarterly earnings that exceeded expectations, with the combined AI-driven capital expenditure guidance from the three firms swelling toward $725B on a cumulative basis. MSFT posted $281.7B in revenue (+14.9% YoY) with a 68.8% gross margin and $13.64 diluted EPS. META delivered $201.0B (+22.2% YoY) at a 30.1% net margin and $23.49 EPS, while GOOGL topped $402.8B (+15.1% YoY) at a 32.8% net margin and $10.81 EPS — all three showing that aggressive AI investment is not yet compressing profitability.

The significance is that critics had been arguing Big Tech capex was spiraling out of control, and this earnings night offered a concrete rebuttal: margins held, revenues accelerated, and management teams doubled down on spend guidance. The read-through touches AI infrastructure beneficiaries — NVDA, AVGO, AMD on chips; AMZN and MSFT Azure on cloud — as sustained demand signals de-risk the 2025-2026 capex cycle.

The second-order setup is nuanced. If capex continues to scale without proportional revenue lift, margin erosion becomes a 2026 story — but that risk is not yet in the numbers. The more immediate tension is whether the market was already pricing in a strong beat, meaning the 'silencing' effect is partially discounted. MSFT in particular, with its 68.8% gross margin and Azure AI attach rates, looks best-positioned to convert spend into durable earnings power.

What to watch: Azure growth exit rates, Meta's ad-revenue-to-AI-cost spread, and any deceleration in Alphabet's Google Cloud segment. Forward capex guidance revisions will be the key tell — upward revisions that hold margins will sustain the bull case; any margin guide-down will revive the critics.