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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.

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

Wireless service

Telecommunications · 2023
HHI
3,550
Review flags
1
Sources
1
HHI not published0Below 1,80011,800-2,5000Above 2,5001
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

Wireless service

Telecommunications · 2023

HHI3,550
Review flags1
Participants0
Sources1

Verified public record

Agency or official record with verified public inputs.

Definition
Agency defined
Use
Screen only
Publisher
Federal Communications Commission
Accessed
May 16, 2026
Profile Source

Comparison set

0/4

Add two profiles to open a full comparison.

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Coordinate custody: HHI supplies the only numeric position. Evidence posture is a published category, not a synthetic score; profiles without HHI remain visible in the withheld lane.

Evidence standard

Open data packet

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

12

markets

8

sectors

8

threshold review

4

data gaps

Browse sector pressure

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.

12

Profiles

8

Review threshold

4

Evidence gaps

Concentration action queue

i

2 markets in view, 2 in the all signals layer. HHI, source coverage, and the government lane re-rank together.

Review thresholdModerateLowerData limited
Priority docket2 visible
Showing top 2 of 2 all signals marketsSource-backed profiles

Latest source access

Jul 21, 2026

Public evidence ledger

Freshest vintage

2026

2 HHI-ranked in this view

Agency-ready

2

Verified with high confidence

Evidence packets

17

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 posture2 profiles
Investigatestructural power1
Disclosemissing shares0
Monitorwatch list1
Readyhigh confidence2

Highest-pressure sector

Telecommunications: Concentration pressure

2 filtered profiles, 0 disclosure gaps, 2 agency-ready.

Telecommunications

Investigate

Concentration pressure

2 profiles1 threshold review0 gaps2 HHI rows
1Inv0Disc1Mon2Ready

Profile in focus

U.S. mobile wireless service

Mobile wireless service competition using FCC-reported weighted average HHI by economic area. Firm-level shares are not shown because the FCC report publishes the concentration metric rather than a full public carrier share table.

TelecommunicationsUnited StatesHigh confidence

Market signal

HHI

3,550

CR4

N/A

Top firm

N/A

Highly concentratedVerified metricInvestigate power

Public evidence packet

Observation
2023
Source data
2023
Accessed
May 16, 2026
Links
1 sources / 2 reports

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

1

Disclose

0

Monitor

1

Maintain

0

Next public question

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

Market register

2 filtered · 2 HHI ranked · 1 threshold review · 0 data gaps

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.

Delta Air Lines

17.80% share · rank 1 · Verified · high confidence

Bureau of Transportation Statistics

Tile area is proportional to each firm’s sourced market share. Hatched tiles are aggregate or residual categories, shown for coverage and excluded from firm-level screens.

U.S. domestic airline passengers

Transportation · United States

Classification withheld

HHI

With­held

Not firm-level

Top firm

17.8%

Largest share

CR4

69.0%

Top 4 firms

2026periodBureau of Transportation Statisticssource10sourced firms
Top-share ledgerCR4 69.0%
  1. Delta Air Lines18%
  2. American Airlines18%
  3. Southwest Airlines17%
  4. United Airlines17%
Reusable evidence packetDomestic airlines5 routes
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