Public competition desk

U.S. competition observatory

A one-page view of concentration across markets, where the evidence is missing, and which firms are connected. Use the underlying sources to investigate questions, not to infer a legal violation from a score.

4 markets45 sources0 HHI gaps

Observatory indexChoose the evidence universe

4 public domains

Research desk

See who holds markets and where

Read firm-share structure beside state conditions, sector signals, and auditable market rows.

4in view1filters4sources

Refine market sliceSector, geography, concentration, vintage, status, and confidence1 active4 in view

Market structure

Who holds each market

Tiles are sized by sourced firm-level share. Switch markets to see concentration as structure, not just a single HHI number.

Browse all markets

Defined market

U.S. search engine usage

Digital platforms · United States

Highly concentrated

HHI

7,359

0–10,000 scale

Top firm

85.2%

Largest share

CR4

99.4%

Top 4 firms

2026periodStatCounter Global Statssource6sourced firms

Reusable evidence packetSearch engines5 routes

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

Open full profile

Cross-system state atlas

Two markets, one geography, no composite score.

Compare individual-insurance concentration with a reproducible statewide FDIC branch-deposit screen, then inspect the exact state record behind either layer.

Systems: 2
States: 51
Rows: 102
Sources: 2

Paired relationship plane

Insurance HHI x statewide bank-deposit HHI

Selected jurisdictionDelawareDEPaired readingsInsurance 5,925Banking 4,967Evidence handoffSouthInspector active

MidwestNortheastSouthWestPearson r 0.247 / descriptive only

5Both above31Insurance only0Banking only15Both below

Threshold cohort / 5 jurisdictions

Both systems above 2,500

Threshold-defined cohort in alphabetical order; both exact readings remain separate and are not combined.

Selected jurisdiction / South

Delaware

DE / two bounded systems

FDIC / 2025

Bank-deposit HHI

4,967#1 / 51

Highly concentrated statewide deposit screen.

Leading holder: 67.8%
Deposits: $538.5B
Organizations: 30
Branches: 217

Largest reported holder: Capital One Financial Corporation

KFF / 2024

Individual-insurance HHI

5,925#4 / 51

Leader 75% / 3 insurers above 5%.

Open state evidence profile

FDIC dossier KFF dossier

FDIC source KFF source

Sector priority board

Where concentration becomes policy work

Sectors are ranked by public HHI signals, data completeness, and the next public-interest action needed to keep markets fair.

Sectors

Profiles

Review

Gaps

Digital platforms

4 market profiles

Priority review

5,624

Avg HHI

High

Gaps

HHI intensity5,624

Profile coverage4

Public action

Prioritize agency review

High concentration should move toward agency questions and remedy review.

Focus this sector

Markets at a glance

Only sourced metrics are shown in ranking views.

Each row is a public evidence packet: exact metrics, source status, data freshness, action cue, and a machine-readable route. No composite score is used; signal basis lists the published metric flags behind each cue.

ranked rows

high concern

data gaps

source-backed

Rank	Market	HHI	CR4	Top firm	Class	Signal basis	Evidence	Action
1	U.S. search engine usage Digital platforms · United States 1 source	7,359	99.4%	85.2%	Highly concentrated	HHI >= 2,500 CR4 >= 60% Top firm >= 35%	Public estimate StatCounter Global Stats Reviewed Jul 17, 2026 Open rows	Investigate Probe entry barriers, switching costs, pricing, and remedies.
2	U.S. generative AI assistant usage Digital platforms · United States 1 source	4,804	94.8%	67.1%	Highly concentrated	HHI >= 2,500 CR4 >= 60% Top firm >= 35%	Public estimate StatCounter Global Stats Reviewed Jun 23, 2026 Open rows	Investigate Probe entry barriers, switching costs, pricing, and remedies.
3	U.S. mobile operating-system web usage Digital platforms · United States 1 source	5,337	100.0%	63.1%	Highly concentrated	HHI >= 2,500 CR4 >= 60% Top firm >= 35% HHI +180 since 2023	Public estimate StatCounter Global Stats Reviewed Jul 20, 2026 Open rows	Investigate Probe entry barriers, switching costs, pricing, and remedies.
4	U.S. social-media referral traffic Digital platforms · United States 1 source	4,995	94.4%	68.9%	Highly concentrated	HHI >= 2,500 CR4 >= 60% Top firm >= 35% HHI +1,602 since 2023	Public estimate StatCounter Global Stats Reviewed Jul 20, 2026 Open rows	Investigate Probe entry barriers, switching costs, pricing, and remedies.

#1 · Digital platforms

U.S. search engine usage

United States

HHI

7,359

CR4

99.4%

Top firm

85.2%

Signal basis

HHI >= 2,500
CR4 >= 60%
Top firm >= 35%

Highly concentratedEstimated from public dataInvestigate

StatCounter Global Stats

1 source · reviewed Jul 17, 2026

Probe entry barriers, switching costs, pricing, and remedies.

Profile

Reuse evidenceCite · API · files

JSON CSV

#2 · Digital platforms

U.S. generative AI assistant usage

United States

HHI

4,804

CR4

94.8%

Top firm

67.1%

Signal basis

HHI >= 2,500
CR4 >= 60%
Top firm >= 35%

Highly concentratedEstimated from public dataInvestigate

StatCounter Global Stats

1 source · reviewed Jun 23, 2026

Probe entry barriers, switching costs, pricing, and remedies.

Profile

Reuse evidenceCite · API · files

JSON CSV

#3 · Digital platforms

U.S. mobile operating-system web usage

United States

HHI

5,337

CR4

100.0%

Top firm

63.1%

Signal basis

HHI >= 2,500
CR4 >= 60%
Top firm >= 35%
HHI +180 since 2023

Highly concentratedEstimated from public dataInvestigate

StatCounter Global Stats

1 source · reviewed Jul 20, 2026

Probe entry barriers, switching costs, pricing, and remedies.

Profile

Reuse evidenceCite · API · files

JSON CSV

#4 · Digital platforms

U.S. social-media referral traffic

United States

HHI

4,995

CR4

94.4%

Top firm

68.9%

Signal basis

HHI >= 2,500
CR4 >= 60%
Top firm >= 35%
HHI +1,602 since 2023

Highly concentratedEstimated from public dataInvestigate

StatCounter Global Stats

1 source · reviewed Jul 20, 2026

Probe entry barriers, switching costs, pricing, and remedies.

Profile

Reuse evidenceCite · API · files

JSON CSV