Explore market concentration.

See how concentrated each market is, how that has changed, and who the largest firms are. Every figure keeps its market definition and source; concentration alone does not establish harm or unlawful conduct.

Open workbench Housing data gap

markets

sectors

threshold review

data gaps

Sector intelligence

Where the next public case starts

Compare

TransportationDisclosure gap13readinessDemand disclosure Food and agricultureDisclosure gap26readinessDemand disclosure Real estateDisclosure gap26readinessDemand disclosure

Open workbench Housing data gap

Structure × evidence atlas

Read concentration and public-evidence posture together

Horizontal position is latest published HHI. Vertical rows are categorical evidence states; missing HHI stays in its own lane.

Profiles128 sectors

Published HHI8exact numeric axis

HHI withheld4explicit categorical lane

Public sources170 selected to compare

Focused profile

Search engines

Digital platforms · 2026

HHI: 7,359
Review flags: 3
Sources: 1

Open profile

HHI not published0Below 1,80001,800-2,5000Above 2,5004

Latest published HHI · 0-10,000 numeric scale after the withheld lane

Digital platforms 4Food and agriculture 1Health care 1Health insurance 1Real estate 1Software 1Telecommunications 2Transportation 1

Focused profile

Search engines

Digital platforms · 2026

HHI7,359

Review flags3

Participants7

Sources1

Estimated public screen

Public inputs support a descriptive estimate, with uncertainty retained.

Definition: Public proxy
Use: Screen only
Publisher: StatCounter Global Stats
Accessed: Jul 17, 2026

Profile Source

Comparison set

0/4

Add two profiles to open a full comparison.

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Open data packet

Pull the atlas into notebooks, spreadsheets, source review, or the public data console.

JSONMarkets API12 profile rows CSVDownload rowsspreadsheet-ready ConsoleData workbenchinspect fields SourcesSource ledger17 public records

Why this atlas exists

Concentrated markets turn daily needs into extraction.

Mission

49.7%renter households cost-burdenedMore than 21 million U.S. renter households spent over 30% of income on housing costs in 2023.Census ACS 2023 33.4%consumer spending went to housingHousing averaged $26,266 in 2024, the largest household expense in the Consumer Expenditure Survey.BLS Consumer Expenditures 2024 20 stateswhere one PBM held at least half a marketFTC staff reported a single top PBM had at least 50% retail pharmacy network-management share in 20 states.FTC PBM interim report

markets

sectors

threshold review

data gaps

Sector intelligence

Where the next public case starts

Compare

TransportationDisclosure gap13readinessDemand disclosure Food and agricultureDisclosure gap26readinessDemand disclosure Real estateDisclosure gap26readinessDemand disclosure Health careDisclosure gap13readinessDemand disclosure

Browse sector pressure

Digital platforms4 markets · 4 threshold review · 0 gapsLeadSearch engines Transportation1 market · 1 threshold review · 1 gapLeadDomestic airlines Telecommunications2 markets · 1 threshold review · 0 gapsLeadWireless service Real estate1 market · 0 threshold review · 1 gapLeadRental housing Food and agriculture1 market · 0 threshold review · 1 gapLeadBeef meatpacking Health insurance1 market · 1 threshold review · 0 gapsLeadIndividual insurance

Digital platform systems

Inspect recurring products without merging their markets.

Search referrals, browser page views, mobile operating systems, social referrals, and AI assistant usage retain separate denominators, source histories, and interpretation limits.

Systems: 5
Anchors: 17
Sources: 5

Open platform systems

Public market power atlas

Explore where public evidence shows concentrated power, where the record is strong enough for scrutiny, and where missing data should become a government disclosure agenda.

4 live

Profiles

Compare profiles Rank markets Open source ledger

Profiles

Review threshold

Evidence gaps

Public mandate

Competition policy starts with the market people actually face.

Live filter

Investigate

high power

Disclose

missing shares

Monitor

public baseline

Government duty4 markets in scope

Do not wait for perfect disclosure: use public evidence to identify bottlenecks, require reusable market-share data, and keep concentrated markets on the public record.

Concentration action queue

4 markets in view, 4 in the all signals layer. HHI, source coverage, and the government lane re-rank together.

HHI scale · 0-10,000Evidence · public source rowsLane · investigate, disclose, monitorHow to read

Review thresholdModerateLowerData limited

4 live

Priority docket4 visible

1Search enginesHHI 7,359 · CR4 99.4% · 1 sourceDigital platformsInvestigate 2Mobile operating systemsHHI 5,337 · CR4 100.0% · 1 sourceDigital platformsInvestigate 3Social referralsHHI 4,995 · CR4 94.4% · 1 sourceDigital platformsInvestigate 4AI assistantsHHI 4,804 · CR4 94.8% · 1 sourceDigital platformsInvestigate

SectorsDigital platforms

Filtered atlas

all signals in the live filter set

Filtered summary

4Review threshold

0Moderate HHI

0Data gaps

Threshold-review sectors

Digital platforms4

Showing top 4 of 4 all signals marketsSource-backed profiles

Latest source access

Jul 21, 2026

Public evidence ledger

Freshest vintage

2026

4 HHI-ranked in this view

Agency-ready

Verified with high confidence

Evidence packets

22 related briefings

Sector pressure

Which sectors drive this evidence set?

The matrix reads the current filters by sector, action posture, public-data gaps, and agency-ready evidence.

Decision posture4 profiles

Investigatestructural power4

Disclosemissing shares0

Monitorwatch list0

Readyhigh confidence0

Highest-pressure sector

Digital platforms: Concentration pressure

4 filtered profiles, 0 disclosure gaps, 0 agency-ready.

Digital platforms

Investigate

Concentration pressure

4 profiles4 threshold review0 gaps4 HHI rows

4Inv0Disc0Mon0Ready

SectorGeographyStatusConfidenceSort

Profile in focus

U.S. search engine usage

All-platform U.S. search engine usage share from StatCounter Global Stats for April 2026. The market is an observed usage-share proxy, not search advertising revenue.

Digital platformsUnited StatesMedium confidence

Market signal

HHI

7,359

CR4

99.4%

Top firm

85.2%

Highly concentratedEstimated from public dataInvestigate power

Public evidence packet

Observation: 2026
Source data: 2026
Accessed: Jul 17, 2026
Links: 1 sources / 3 reports

Reusable route bundle

Profilefull market dossier Source rows1 linked source Market JSONmachine-readable row Data consolescoped API workbench Action briefturn signal into ask

Government next step

Open a market power inquiry

Prioritize merger history, pricing conduct, entry barriers, and local harm evidence for enforcement review.

Filtered public-interest docket

Turn this filtered set into a government work plan.

The atlas now translates the same filters into action priorities: investigate concentrated power, disclose missing evidence, monitor rising concentration, or keep a public baseline current.

Investigate

Disclose

Monitor

Maintain

Investigate power#1 priority

U.S. search engine usage

Open a market power inquiry

Prioritize merger history, pricing conduct, entry barriers, and local harm evidence for enforcement review.

HHI 7,359CR4 99.4%Top firm 85.2%

Investigate power#2 priority

U.S. mobile operating-system web usage

Open a market power inquiry

Prioritize merger history, pricing conduct, entry barriers, and local harm evidence for enforcement review.

HHI 5,337CR4 100.0%Top firm 63.1%

Investigate power#3 priority

U.S. social-media referral traffic

Open a market power inquiry

Prioritize merger history, pricing conduct, entry barriers, and local harm evidence for enforcement review.

HHI 4,995CR4 94.4%Top firm 68.9%

Investigate power#4 priority

U.S. generative AI assistant usage

Open a market power inquiry

Prioritize merger history, pricing conduct, entry barriers, and local harm evidence for enforcement review.

HHI 4,804CR4 94.8%Top firm 67.1%

Next public question

Can leading firms raise prices, reduce quality, or block entry without losing meaningful share?

Market register

4 filtered · 4 HHI ranked · 4 threshold review · 0 data gaps

Review thresholdData gapsHHI available

Rank	Market	Sector	HHI	CR4	Top firm	Class	Data status	Source basis	Open
1	U.S. search engine usage United States · 2026	Digital platforms	7,359	99.4%	85.2%	Highly concentrated	Estimated from public data	StatCounter Global Stats 1 source · Medium confidence	Open profile
2	U.S. mobile operating-system web usage United States · 2026	Digital platforms	5,337	100.0%	63.1%	Highly concentrated	Estimated from public data	StatCounter Global Stats 1 source · Medium confidence	Open profile
3	U.S. social-media referral traffic United States · 2026	Digital platforms	4,995	94.4%	68.9%	Highly concentrated	Estimated from public data	StatCounter Global Stats 1 source · Medium confidence	Open profile
4	U.S. generative AI assistant usage United States · 2026	Digital platforms	4,804	94.8%	67.1%	Highly concentrated	Estimated from public data	StatCounter Global Stats 1 source · Medium confidence	Open profile

#1 · Digital platforms

U.S. search engine usage

All-platform U.S. search engine usage share from StatCounter Global Stats for April 2026. The market is an observed usage-share proxy, not search advertising revenue.

3 review flags

HHI

7,359

CR4

99.4%

Top firm

85.2%

Highly concentratedEstimated from public dataMedium confidence

#2 · Digital platforms

U.S. mobile operating-system web usage

Mobile operating-system concentration based on the operating systems detected in U.S. mobile page views measured by StatCounter in April 2023-April 2026. The series is a public web-usage proxy rather than device sales, installed base, app-store activity, or operating-system revenue.

3 review flags

HHI

5,337

CR4

100.0%

Top firm

63.1%

Highly concentratedEstimated from public dataMedium confidence

#3 · Digital platforms

U.S. social-media referral traffic

Social-platform concentration based on U.S. page views referred from social-media sites to StatCounter-tracked websites in April 2023-April 2026. The series measures outbound referral traffic, not platform users, time spent, advertising revenue, engagement, or an antitrust market.

3 review flags

HHI

4,995

CR4

94.4%

Top firm

68.9%

Highly concentratedEstimated from public dataMedium confidence

#4 · Digital platforms

U.S. generative AI assistant usage

Consumer generative AI assistant usage concentration from StatCounter Global Stats for May 2026. The market tracks which AI chatbots people use across StatCounter-tracked assistants, an observed usage-share proxy rather than revenue, total user counts, or the broader AI supply chain of chips and cloud.

3 review flags

HHI

4,804

CR4

94.8%

Top firm

67.1%

Highly concentratedEstimated from public dataMedium confidence

Market share treemap

Visualize market structure

A treemap reads concentration at a glance: one dominant tile signals a market held by a single firm, while many even tiles signal real rivalry. Switch markets to compare.

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Defined market