Alphabet and Microsoft reported strong sales for quarters ending September 30, but the useful comparison is how much cash they produced and spent while building AI infrastructure. Their cloud categories are defined differently. Their capital spending also has different timing and business mixes. This is a cash bridge, not a ranking of which company has the better AI business. Alphabet Q3 release · Microsoft fiscal Q1 release
Sales and operating momentum
Alphabet reported $127.58 billion of quarterly revenue, up 25% from a year earlier. Google Cloud revenue was $30.7 billion, up 103%, including sales of TPU systems that were not separately quantified in the release. Microsoft reported $92.3 billion of revenue, up 19%, and $45.9 billion of operating income, up 21%. Microsoft Cloud revenue was $63.9 billion, up 30%, while Azure and other cloud services grew 48%.
Google Cloud and Microsoft Cloud are not the same product perimeter, so setting their dollar totals side by side does not establish a cloud-market-share winner. The reported growth rates describe each company's own category.
Cash generated and cash invested
Alphabet generated $42.29 billion of operating cash and spent $51.36 billion on purchases of property and equipment. Its company-reported free cash flow, using that subtraction, was negative $9.07 billion for the quarter. Its trailing-12-month free cash flow remained positive $19.75 billion. One investment-heavy quarter does not erase the trailing cash generation, but the near-term cash burden is real.
Microsoft generated $58.00 billion of operating cash and reported $39.37 billion of additions to property and equipment. Subtracting those two reported lines yields $18.63 billion. That is our simple cash bridge, not a Microsoft-labeled free-cash-flow metric. It omits any other cash-flow adjustments a chosen definition might make. The two bridges are a useful picture of investment intensity; they do not settle relative valuation.
Alphabet reported diluted earnings of $2.12 a share versus $2.87 a year earlier. Its release attributes a $0.55 per-share effect to an $8.7 billion equity-securities loss, so the EPS decline should not be described as an operating collapse. Microsoft reported GAAP diluted EPS of $4.92, up 32%; its separate adjusted EPS was $4.89, up 18%, after an adjustment related to OpenAI investments. These EPS definitions and share prices are not directly comparable across companies.
What the chart should test
Both earnings releases followed the completed October 28 regular session. Alphabet closed that session at $324.89, below its 50-day average of $341.51 and 200-day average of $341.20. The price charts below end on October 28, before the results. In separately observed October 29 regular-session prints, Alphabet traded around $285, roughly 12% below its October 28 close, while Microsoft traded around $525, roughly 1% below its prior close. Those are intraday observations, not completed candles or continuously updated quotes, and the different reactions alone do not identify a cause. Alphabet's observed print was already below the October 28 chart's July 23 six-month intraday low of $314.90. A daily close back above that dated level is the first reclaim test; the $324.89 October 28 close is a higher reference level. Microsoft likewise needs a daily close back above its $531.01 October 28 close to show repair. These are conditions to watch, not predicted targets. The post-report session lows will be known only after October 29 completes.
The next quarter should answer whether revenue growth and contracted demand outrun the cash spent on infrastructure. Market research only, not a recommendation to buy or sell.