Antitrust Radar
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Latest accessAug 202645 public source recordsHigh-HHI profiles7/12current profiles at 2,500+ HHIHousing stress49%renters cost burdenedOpen rows235,81062 JSON and CSV endpointsView all updates

Public-interest competition observatory

Antitrust Radar

Latest recorded source access Aug 2026 · 235,810 public rows · 45 source records

Open-access research on market concentration, industry change, and competition policy. Researchers and journalists can explore the data, inspect our methods, and download evidence for their own analysis. Each finding includes its sources and limits.

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State competition atlas

Where is insurer concentration highest?

ACA individual insurance, 2024. Select a state to inspect its public record.
Use arrow keys to move between state records, then follow the selected state evidence link for sources and history.
HHIBelow 1,0004,000+
6,945Highly concentratedKFF 2024
HHI >= 2,50036/51
U.S. benchmark3,650
SourceKFF 2024
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Source: KFF · 2024

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Where is insurer concentration highest? · 2024
Jurisdictionmarket HHI
6,945
6,102
5,965
5,925
5,804
5,695
5,648
5,433
5,385
5,304
5,025
4,983
4,975
4,878
4,225
4,167
4,116
3,963
3,955
3,916
3,864
3,666
3,644
3,547
3,450
3,414
3,396
3,387
3,255
3,222
2,957
2,868
2,831
2,811
2,793
2,561
2,464
2,437
2,413
2,410
2,389
2,353
2,334
2,311
2,222
2,213
2,071
1,772
1,619
1,582
1,474
75%+industries more concentrated since the late 1990sGLM · Review of Finance · 2019 22.7Mrenter households cost burdened in 2024JCHS 2026 22% / 4%institutional rental share: Jacksonville / SeattleGAO 2026 · 2024 six-metro study
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Antitrust Radar