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Canonical indicator / market-hhi

Tracked market HHI

Source-reported or reproducibly calculated HHI anchors from documented market profiles.

Curated marketsHHI (0-10,000)Calendar or release yearLatest available by entity

Snapshot median

4,227Middle of 8 bounded observations
Observations
26
8 bounded entities
Coverage
2017-2026
8 observed periods
Sources
8
Federal Communications Commission / StatCounter Global Stats
Exact pair
r 0.749
17 entity-period matches

01 / Measurement contract

Definition before comparison

The unit, universe, period, and source boundary travel with every observation.

What this series measures

Source-reported or reproducibly calculated HHI anchors from documented market profiles.

HHI remains definition-dependent. Ranking tracked markets is a descriptive screen across separately documented product, geography, and denominator contracts, not a legal market-power comparison.
Indicator ID
market-hhi
Unit
HHI (0-10,000)
Observation dimension
Market
Grouping field
Sector
Period basis
Calendar or release year
Ranking contract
Use the latest available row for each entity

02 / Observed variation

Entity distribution and ranked anchors

Latest available by entity; absent and withheld values do not enter the distribution.

Minimum
1,501
25th percentile
3,596.5
Median
4,227
75th percentile
5,080.5
Maximum
7,359

Observed variation

Each view keeps the same indicator, unit, and evidence boundary.
Selected interval3,258.4 to 3,844.23 observations / 37.5% of the snapshot
Ranked reference rowsHHI (0-10,000)
  1. 01Search enginesus-search-engine-usage / 20267,359
  2. 02Mobile operating systemsus-mobile-operating-system-usage / 20265,337
  3. 03Social referralsus-social-media-referral-traffic / 20264,995
  4. 04AI assistantsus-ai-assistant-usage / 20264,804
  5. 05Individual insuranceus-aca-individual-health-insurance / 20243,650
  6. 06Browsersus-browser-usage / 20263,612
  7. 07Wireless serviceus-mobile-wireless-service / 20233,550
  8. 08Fixed broadbandus-fixed-broadband-access / 20241,501

03 / Coverage and quality

Where the series has evidence

Observed rows are counted explicitly by period, group, verification status, and confidence level.

Period ledger8 observed periods
20171 entity11 source
20201 entity11 source
20212 entities22 sources
20221 entity11 source
20236 entities66 sources
20246 entities66 sources
20254 entities44 sources
20265 entities55 sources
Evidence stateAll indicator observations

Data status

30.8%Verified / 869.2%Estimated public / 18

Confidence

34.6%High / 965.4%Medium / 17
SectorLatest bounded snapshot, largest groups first
GroupRowsAverageRange
Digital platforms45,623.84,804 to 7,359
Telecommunications22,525.51,501 to 3,550
Health insurance13,6503,650 to 3,650
Software13,6123,612 to 3,612

04 / Exact paired lens

Tracked market HHI and CR4

Same-release HHI and four-firm share anchors for tracked market profiles.

Same entity + same period0.749Pearson correlation across 17 exact pairs

-1 inverse 0 +1 aligned

Pairing rule
Same documented market and release year
Companion indicator
Market CR4
Matched current-series rows
17 / 26 (65.4%)
Unpaired current-series rows
9; excluded from correlation

Interpretation boundaryOnly common-release observations are paired. Missing sides are excluded rather than forward-filled, and separately defined markets remain descriptive screens rather than interchangeable legal markets.

05 / Source custody

Evidence behind the series

8 source families, 1 contextual reference, and 6 encoded methodology notes.

Agency report

Internet Access Services: Status as of December 31 2024

Federal Communications Commission

Rows
5
Years
2020-2024
Accessed
Jul 21, 2026
Public dataset

Mobile operating system market share in United States of America, April 2023-April 2026

StatCounter Global Stats

Rows
4
Years
2023-2026
Accessed
Jul 20, 2026
Public dataset

Social media referral share in United States of America, April 2023-April 2026

StatCounter Global Stats

Rows
4
Years
2023-2026
Accessed
Jul 20, 2026
Public dataset

Browser market share in United States of America, April 2023-April 2026

StatCounter Global Stats

Rows
4
Years
2023-2026
Accessed
Jul 17, 2026
Public dataset

Search engine market share in United States of America, April 2023-April 2026

StatCounter Global Stats

Rows
4
Years
2023-2026
Accessed
Jul 17, 2026
Public dataset

AI chatbot market share in United States of America May 2026

StatCounter Global Stats

Rows
1
Years
2026
Accessed
Jun 23, 2026
Agency report

2024 Communications Marketplace Report

Federal Communications Commission

Rows
3
Years
2017-2023
Accessed
May 16, 2026

Contextual reference register

Interpretive context, kept outside source custody.

1 declared reference
Legal guidance2023

2023 Merger Guidelines

U.S. Department of Justice and Federal Trade Commission

Why linked
The joint agency guidance describes factors and frameworks the agencies often use when reviewing mergers and acquisitions. It explains why HHI can matter in a merger screen but supplies none of this indicator's market observations.
Boundary
The Guidelines are non-binding, and individual matters turn on applicable law and facts. An Antitrust Radar market-HHI row does not establish a relevant market, a structural presumption, liability, or likely competitive effects.

Context is not measurement custody.These works explain a legal or research frame. They add zero observations and do not alter this indicator's source counts, values, ranks, or coverage.

Reusable indicator packetExact rows, stable identifier, and explicit route contract
Canonical URL
/indicators/market-hhi
Indicator filter
indicator=market-hhi
License
Antitrust Radar compilation: CC BY 4.0; upstream terms remain in force
Method notes encoded on rowsNo inferred methodology is substituted
  1. 01

    Use FCC source-reported weighted average HHI; do not infer carrier shares.

  2. 02

    Use the source-reported December national HHI as the annual market-profile anchor; retain subnational medians in the linked geographic series.

  3. 03

    HHI is computed from six named StatCounter shares and a residual Other category that closes coverage to 100 percent.

  4. 04

    HHI is computed from every category in the pinned StatCounter April mobile operating-system row; source labels and rounding are preserved.

  5. 05

    HHI is computed from every category in the pinned StatCounter April social-media row; the denominator is outbound referral traffic to sampled third-party websites.

  6. 06

    Use the KFF source-reported national HHI as a bounded profile anchor and retain the separately reported jurisdiction measures in the linked geography system.

Indicator evidence guardrail

One measure, one contract

This profile documents one bounded indicator at a time. Its ranks, distributions, histories, and paired views remain inside the stated universe, period basis, source, unit, and methodology; they are descriptive research screens, not legal findings or components of a composite score.

HHI remains definition-dependent. Ranking tracked markets is a descriptive screen across separately documented product, geography, and denominator contracts, not a legal market-power comparison.

Read methodology