Concentration: Oracle Holds 26.7% of Intensity Sum — Top-3 Clears 69%; Dollars Still Crown Amazon

Our theme already maps the level of reinvestment: the July intensity research put five hyperscalers inside an 18–37% band; the August update, Q3 mid-guide, and late-Aug 202608 refresh then tracked weighted intensity from ~21.8% to ~27.8%. The spend concentration companion answered the dollar distribution question. This post asks the sharper ratio question: how concentrated is the intensity distribution itself — and is that top of the ladder still cash-flow sustainable?

The interactive dashboard above is a concentration lens, not another KPI strip. Top-1 share is 26.7% of the intensity sum (Oracle at 43.5% of revenue). Top-3 share is 69% (Oracle + Meta + Alphabet). Approximate Big-5 intensity HHI is ~2,121 — elevated versus a five-way equal split (~2,000). Flip the perimeter to capex dollars and Amazon still leads at ~34% — ratios and dollars disagree on who sits at the top.

The concentration scoreboard

Read the table as a family of market shares, not one number. Intensity-sum concentration is a two-firm extreme at the top (Oracle and Meta together clear half the intensity sum) with a flatter middle. Dollar concentration is Amazon-led and thicker at Top-3. Excess-above-norm sharpens the same Oracle/Meta story: the “extra” reinvestment pool is even more top-heavy than the raw intensity sum.

Analysts who only quote Amazon’s absolute program understate how extreme ratios have become at Oracle and Meta. Analysts who only quote Oracle’s 43.5% understate that Amazon still funds the largest share of the physical build.

Intensity ladder: Oracle and Meta own the extreme

Filter the dashboard to Intensity ladder → Late-Aug → Intensity-sum shares. The cumulative curve rises to 26.7% at Top-1 (Oracle), 51.6% at Top-2 (plus Meta at 40.5% intensity / 24.9% of the sum), and 69% at Top-3 (plus Alphabet at 28.3%). Microsoft (26.8%) and Amazon (23.8%) fill the lower rungs — still above the 20% telecom reference, but no longer defining the thick end of the ratio distribution.

That is the first hinge. Dollar posts crown Amazon because AWS-scale revenue can absorb a mid-twenties intensity and still print the largest check. Intensity posts crown Oracle and Meta because smaller revenue bases push the same AI build into the low-to-mid forties. Same vintage, inverted ranking.

Toggle Excess vs cloud norm. Excess top-1 rises to 30.1% and excess top-3 to 73.4% — every point above the 11% pre-AI cloud decade is treated as “extra” reinvestment. Oracle’s 32.5 pp of excess and Meta’s 29.5 pp dominate that pool; Amazon’s 12.8 pp of excess is real but diluted by the giants above.

Dollars vs ratios: two tops, one system

Open Excess concentration for the dual-perimeter bars. Amazon’s dollar share (~34%) towers over its intensity-sum share (~15%). Oracle flips the other way: ~7% of Big-5 dollars, ~27% of the intensity sum. Meta and Alphabet sit in between — large enough to matter in both ledgers, extreme enough to pull the ratio ladder upward.

This is the second hinge. A credit desk that underwrites leverage and FCF conversion should live on the intensity ladder. A supply-chain or power desk that underwrites physical GW and silicon should live on the dollar ladder — and then pair it with the spend concentration companion. Collapsing the two into one “hyperscaler concentration” statistic mis-ranks risk.

Revenue-weighted intensity across the five still prints about 28.5% late-Aug — close to the Big-4 (ex-Oracle) 27.8% in the 202608 intensity update. Weighted averages soften Oracle’s ratio extreme; concentration metrics put it back on the scoreboard.

Multi-year path: top-1 stable, levels climb

Switch to Multi-year path. Top-1 intensity-sum share barely moves: 27.9% in FY24 (then Meta), 28.5% in FY25 (Oracle takes the crown), 26.7% late-Aug. Top-3 holds near 69% across the path. What does climb is the absolute intensity at the top — Oracle from 13% (FY24) to 43.5%, Meta from 22.8% to 40.5% — and the revenue-weighted system intensity from the low twenties toward the high twenties.

HHI on the intensity-sum perimeter sits near 2,100–2,200 across vintages — modestly above a five-way equal split (2,000). This is not a single-name monopoly story. It is a stable two-firm extreme sitting on top of a rising mean.

The Q3 mid-guide and late-Aug desk step moved Amazon, Alphabet, and Meta intensities up without breaking the Oracle/Meta ordering. Concentration shape was sticky; concentration altitude was not.

Sustainability: high intensity, thin FCF

Open Sustainability. The scatter plots intensity against free-cash-flow margin with bubble size ∝ capex dollars. Microsoft still prints the comfortable corner — 26.8% intensity with ~21% FCF margin. Amazon sits near the floor on FCF (~0.3%) despite “only” 23.8% intensity — scale without cushion. Oracle pairs the highest intensity (43.5%) with ~3% FCF. Meta (40.5% intensity / ~13% FCF) is the stretched middle: still cash-generative, but deep inside the foundry-like ≥35% band.

All five names sit above the 20% telecom reference. Two (Oracle, Meta) sit in the extreme band the theme has tracked since the July research baseline. That is the third hinge: concentration of intensity at the top is also concentration of cash-flow stress — not identically ranked (Amazon’s FCF stress is a scale story), but overlapping enough that the top of the intensity ladder is where funding questions get sharpest.

Pair this panel with the late-Aug intensity update for vintage deltas and with the AI financing theme for how debt is absorbing the gap when FCF no longer covers the build.

Who is exposed — and what would change the story

Exposed: equity desks that treat “hyperscaler capex” as a single Amazon-led beta when ratio stress sits at Oracle/Meta; credit desks that underwrite Amazon’s FCF squeeze without noticing Oracle’s intensity extreme; policy and power desks that use intensity rankings to infer watt shares (they will mis-rank Amazon); theme readers who quote only the weighted 28.5% average and miss that Top-2 already holds half the intensity sum.

Relative winners under current meters: Microsoft on the sustainability scatter (high intensity with FCF cushion); Amazon on physical build share even while trailing on ratios; suppliers priced to dollar concentration rather than ratio concentration; credit structures that can term out Oracle/Meta’s multi-year intensity without assuming a quick mean-reversion to the cloud decade’s 11%.

What would change the story: Oracle or Meta intensity compressing back toward the mid-twenties (Top-1 share would fall even if dollars stayed elevated); Amazon intensity rising into the thirties without FCF recovery (dollar and ratio tops would align — a worse systemic signal); a sustained HHI break above ~2,400 on the intensity-sum perimeter; revenue-weighted intensity rolling over while Top-1 stays extreme (a bifurcation into “cheap scale” vs “expensive specialists”). None of those cleanly appear in the late-Aug 202608 tape — the path still shows sticky Top-1/Top-3 shares on a rising mean.

Caveats and methodology

• Intensity = gross PP&E purchases ÷ total revenue on the same desk vintage as the companion intensity updates. Microsoft FY26 intensity is disclosed; Amazon / Alphabet / Meta late-Aug prints are desk-scaled from Q3 mid-guides; Oracle FY26 guide intensity is held.
• Intensity-sum shares treat each firm’s intensity as a weight in a five-point distribution. They answer “how concentrated is the ratio ladder,” not “what share of global IT capex.” Capex-dollar shares answer the second question inside the Big-5 perimeter.
• Excess intensity subtracts an 11% pre-AI cloud norm used across the theme. Changing the benchmark (e.g. to the 20% telecom norm) re-scales excess shares but does not flip Oracle/Meta leadership on the late-Aug tape.
• HHI uses percentage-point shares of the chosen perimeter and is comparable only within that perimeter. Equal five-way share ⇒ HHI = 2,000.
• FCF margin = (operating cash flow − capex) ÷ revenue. Lease accounting, customer prepayments (Oracle), and finance-lease principal can move reported FCF without changing the physical buildsee the spend theme’s economic vs accounting notes.
• This is a concentration cut, not a restatement of weighted intensity levels. For vintage deltas on the 27.8% Big-4 weighted print, use the 202608 intensity update.

Primary sources: Microsoft FY26 Form 10-K (held intensity; FCF path); Amazon, Alphabet, and Meta late-Aug CY26 midpoint steps aligned with the companion intensity and spend trackers; Oracle FY26 guide intensity; prior theme vintages in capex intensity update (202608), Q3 intensity mid-guide, August intensity update, and intensity research; dollar-distribution context from AI capex spend concentration.