Data infrastructure / open access

Public data catalog

Download the records behind the research, including market shares, concentration measures, official events, and source references. Coverage and missing values are documented for each dataset.

Latest reviewAug 15, 202645 sources Endpoint rows235,809JSON + CSV Dataset families62public endpoints CSV releasereadysummary export

Source-to-API route

Public records become reusable evidence.

JSON CSV

01Sources45 records 02Markets12 profiles 03Metrics8 HHI rows 04API62 endpoints

Source-to-API route

Public records become reusable evidence.

JSON CSV

Record rows235,808HHI8Gaps4

Data desk

Query rows and trace their custody

Filter public endpoints, inspect schemas, and follow datasets from source review into reusable outputs.

62datasets235,808record rows5desks

Open data observatory

Source records move through market definitions, concentration calculations, confidence labels, and public data endpoints — 45 source records, 12 market profiles, 235808 record rows plus a 1 row summary endpoint across 62 API endpoints.

Source-to-API route

Trace public records into reusable data.

JSON CSV

01Sources45 records 02Markets12 profiles 03Metrics8 HHI rows 04API62 endpoints

Record rows

235,808

Sources

Endpoints

Bulk library55 endpoint families + schemas JSONmetadata + rows CSVspreadsheet export API Labrun + copy requests Notebooklineage and analysis handoff

Aug 15, 2026

Latest source review

Dataset families

Source types

Public data access

Use the observatory data directly.

Public-interest exploration needs the underlying data to be inspectable. These JSON and CSV endpoints expose the same public records that power profiles, rankings, reports, and the evidence ledger.

Active query packet

HSR monthly activity routes to 120 rows with JSON, CSV, notebook, and citation reuse.

Route 100%Full dataset

All public rows are available for audit, download, or reuse.

/api/public/merger-monthly

JSON CSV Inspect

Datasets

Aug 2026

Freshness

Dataset finder

62/62

dataset rows

120

Source scope

all sources

Report scope

all reports

Active endpoint

dataset-wide

Live public route

120 rows returned from HSR monthly activity; dataset-wide public route.

Route 100%Full dataset

All public rows are available for audit, download, or reuse.

ScopeFull public datasetDataset-wide public route DatasetHSR monthly activity8 declared fields FilterswideFull public dataset JSON120 rows/api/public/merger-monthly CSVexport/api/public/merger-monthly?format=csv

JSON + CSV

Typed rows, filtered exports, and confidence labels.

Source limits

Incomplete or estimated evidence stays visible.

Reusable

Copy the endpoint, notebook, or citation packet.

DatasetsChoose dataset

62 of 62 dataset families

Selected dataset

HSR monthly activity

Fiscal-month transaction and filing counts for the federal premerger notification program across FY2016-FY2025.

Endpoint rows

120

Scope

Full public dataset

dataset rows

120

endpoint rows

120

dataset rows

120

source

all

report

all

fields

Dataset scope

Use this endpoint's dataset-specific filters rather than market scope.

Source scope

HSR monthly activity declares source custody in its endpoint contract.

Report scope

HSR monthly activity has no shared market-report parameter.

Open JSON Download CSV

Open data needs public interpretation.

The API is a starting point, not a legal conclusion. Pair downloads with methodology notes, source records, and the data-gaps report when citing market concentration.

Methodology Source ledger