Amazon, Alphabet and Microsoft were profiled on September 22 as the cloud giants investors are weighing into month-end. This guide gives you a framework to measure your real cloud exposure, spot where the three overlap so you stop double-counting, and benchmark each name against the broader tech sector. It reports what happened and what you can check, not what to buy or sell.
What actually happened with the three cloud giants on September 22?
On September 22, Amazon (AMZN), Alphabet (GOOGL) and Microsoft (MSFT) were grouped together in coverage as the cloud names investors are reassessing ahead of month-end. The framing was straightforward: three companies that dominate cloud infrastructure, all reporting again in late October, all riding the same AI capital-spending wave.
The mechanical point for a holder is this: these are not three independent bets. Amazon Web Services (AWS), Microsoft Azure and Google Cloud Platform (GCP) compete for the same enterprise budgets, so a shock to cloud demand tends to hit all three at once.
That correlation is the single most useful thing to understand before you look at your own holdings. If you own all three, you may have less diversification than the ticker count suggests.
What is cloud exposure, and why does it hide in a portfolio?
Cloud exposure is the share of your portfolio's value whose earnings depend materially on cloud-computing revenue. It hides because cloud sits inside much larger companies rather than as a standalone line item.
None of these three is a pure cloud play. Cloud is a segment inside a sprawling business:
- Amazon: AWS produced roughly 60% of Amazon's operating income in recent quarters despite being a minority of revenue, so the profit engine is far more cloud-weighted than the top line implies.
- Microsoft: Azure sits inside the Intelligent Cloud segment, alongside server products and enterprise services, blended with Office, Windows and gaming.
- Alphabet: Google Cloud only turned consistently profitable recently and is still small next to Search advertising, which drives the majority of Alphabet's operating income.
So when you say you own "cloud stocks," what you actually own is one ad business, one enterprise-software business and one retail-plus-infrastructure business that happen to share a fast-growing cloud arm.
How do AWS, Azure and Google Cloud compare on the numbers?
AWS remains the largest cloud provider by revenue, Azure is second and growing fastest of the big three, and Google Cloud is third but has moved into steady profitability. Here is the like-for-like snapshot holders reference most.
| Company | Cloud arm | Position | Cloud's role in profit |
|---|---|---|---|
| Amazon (AMZN) | AWS | #1 by revenue | Majority of operating income |
| Microsoft (MSFT) | Azure | #2, fastest large-cap grower | Large, bundled in Intelligent Cloud |
| Alphabet (GOOGL) | Google Cloud | #3 by revenue | Newly profitable, small share |
The takeaway is not a ranking of which is "best." It is that the profit sensitivity to cloud differs sharply. A cloud slowdown hurts Amazon's earnings mix most directly, dents Microsoft meaningfully, and matters least to Alphabet, where advertising still carries the company.
How do you measure your real cloud exposure without double-counting?
Add up the portfolio weight of every holding with cloud earnings, then check for overlap through funds, so the same dollar isn't counted twice. Double-counting is the most common error, and it usually comes from ETFs.
Step 1: List every direct holding with cloud earnings
Start with the obvious three, then widen the net. Names with real cloud revenue include:
- AMZN, MSFT, GOOGL (the big three infrastructure providers)
- Oracle (ORCL) and Salesforce (CRM) on the software side
- Snowflake (SNOW) and Datadog (DDOG), which run on top of the big three
Step 2: Look through your ETFs
This is where the double-counting lives. If you hold an S&P 500 fund, a Nasdaq-100 fund and a technology sector ETF, all three carry heavy weights in AAPL, MSFT, AMZN and GOOGL. As of 2026, the Nasdaq-100 alone has roughly a third of its weight in its five largest names, most of which are cloud-linked.
So a portfolio that looks like "three ETFs plus a bit of Microsoft" can quietly be 25% or more exposed to the same handful of mega-cap tech names.
Step 3: Consolidate to see the true number
The only way to see the real figure is to combine direct shares and fund look-through into one view. If you're using PortfolioTrackr, you can hold positions from multiple accounts in one place and see aggregate weight by ticker across everything you own, which surfaces overlap you'd otherwise miss reading three broker apps separately. Our guide on why a portfolio tracker beats a spreadsheet covers why manual consolidation breaks down once funds are involved.
Why do overlapping cloud holdings reduce your diversification?
Overlapping holdings reduce diversification because correlated assets fall together, so owning more of them doesn't spread risk the way the position count suggests. Three cloud giants that share customers and the same AI spending cycle tend to move as a cluster.
The practical consequences of concentration you didn't intend:
- Shared demand risk: a pullback in enterprise cloud budgets pressures AWS, Azure and GCP together.
- Shared cost risk: all three are spending heavily on AI data centres, so a market that sours on capex can re-rate the group at once.
- Shared regulatory risk: antitrust scrutiny in the US and EU touches all three, and specifically overhangs Alphabet's Search business.
None of this tells you to change anything. It tells you what a single headline could move in your account on the same day. For a parallel example of how one company's news ripples through a sector, see our breakdown of Alibaba's V900 AI chip and what it means for investors.
How do you benchmark each name against the broader tech sector?
Benchmark each stock by comparing its return and valuation against a broad technology index over the same window, so you can see whether a holding is leading or lagging its peers. The comparison only means something when the timeframe and benchmark are held constant.
Pick a consistent benchmark
Most holders use one of these as the tech yardstick:
- The Nasdaq-100 for a mega-cap tech tilt
- A technology sector ETF for a cleaner sector read
- The S&P 500 as the everything-benchmark
Compare on the same clock
Line up each of AMZN, MSFT and GOOGL against your chosen benchmark over identical periods: year-to-date, 1-year and 3-year. A name that trails the benchmark over every window is telling you something different from one that only lagged this quarter.
What benchmarking reports, and what it does not:
- It reports relative performance and valuation gaps.
- It reports whether a position is pulling its weight versus alternatives you already track.
- It does not tell you to trade. The number is context, not an instruction.
PortfolioTrackr shows each holding's return next to a benchmark of your choice, so you can see the spread without exporting anything into a spreadsheet.
What can you set up to stay on top of these three without watching screens?
You can set price alerts on each holding and on watchlist levels, and let the tracker report each position's status against your own targets. That turns three volatile mega-caps into something you monitor passively.
Alerts on the names you hold
With PortfolioTrackr, every position and every watchlist level is checked once a minute, around the clock, and you hear within a minute of your level being hit. Watchlist alerts are on every plan, useful for names like a fourth cloud stock you're researching but don't yet own.
Status against your own targets
PortfolioTrackr reports status against the levels you set yourself: still below target, Target 1 reached, Target 2 reached, or stop-loss level reached. It reports where the price sits relative to your plan. It does not give buy or sell signals and does not decide for you.
Connecting a broker is optional. You can add AMZN, MSFT and GOOGL by manual entry, voice, text, CSV or a broker screenshot on any plan. If you do want to link accounts, our walkthrough on connecting a brokerage account to a portfolio tracker covers the options across the 42 brokers on the SnapTrade bridge plus the three direct integrations, Alpaca, Bybit and Interactive Brokers.
The bottom line
Amazon, Alphabet and Microsoft were profiled together on September 22 because they share a cloud engine, an AI capex cycle and a set of risks, which means owning all three is more concentrated than it looks.
Here is what a holder can check, none of which is advice:
- Your true cloud weight, direct shares plus fund look-through, in one consolidated view.
- Whether ETFs are quietly double-counting the same mega-caps.
- How each name sits against a consistent tech benchmark over matched windows.
- Whether you have alerts set for the levels that matter to you.
Do the measuring first. The decision, if there is one, is yours to make.
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Frequently asked questions
Are Amazon, Microsoft and Alphabet too correlated to hold together?
They share cloud customers, the same AI spending cycle and overlapping regulatory risk, so they tend to move as a cluster. Owning all three is more concentrated than three tickers suggest. Checking your combined weight, including fund look-through, shows whether the exposure matches what you intended.
How do I find out how much cloud exposure my portfolio really has?
Add up the portfolio weight of every holding with cloud earnings, then look through your ETFs, since index and tech funds carry heavy AMZN, MSFT and GOOGL weights. PortfolioTrackr consolidates positions across accounts so you can see aggregate weight by ticker and surface overlap you'd otherwise miss.
Which cloud provider is the largest, AWS, Azure or Google Cloud?
Amazon Web Services is the largest cloud provider by revenue, Microsoft Azure is second and grows fastest among the big three, and Google Cloud is third but has recently reached steady profitability. AWS also carries the biggest share of its parent company's operating income of the three.
What benchmark should I compare cloud stocks against?
Use one consistent benchmark such as the Nasdaq-100, a technology sector ETF, or the S&P 500, and compare each name over identical windows like year-to-date and one year. Holding the timeframe and benchmark constant is what makes the comparison meaningful rather than misleading.
Can PortfolioTrackr alert me when a cloud stock hits my target?
Yes. PortfolioTrackr checks every position and watchlist level once a minute around the clock, and you hear within a minute of your level being hit. It reports status against your own targets, still below target or Target 1 reached, without giving buy or sell advice. Watchlist alerts are on every plan.