Blame for README.md

---
license: other
language:
  - ja
tags:
  - japan
  - company-data
  - corporate-registry
  - open-data
  - b2b-leads
---

# RegBase — Japan New-Company Sales List · Free Sample (2026-11-06, 679 companies)

Japan's National Tax Agency (国税庁) publishes the national corporate registry as
open data. Every day it announces new corporate-number assignments — but a large
share of those announcements are **late publications of companies that were
actually designated months or years earlier**. A raw "new registrations" file
therefore mixes genuinely new companies with old ones.

**RegBase's enriched list** keeps only the companies whose designation date is
the publication date itself, and only the two standard operating forms
(株式会社 / 合同会社). This dataset is the **complete free sample** of that
product: the full one-day file for the 2026-11-06 publication — all 679
companies, not a truncated extract.

## How this sample was made (exclusion arithmetic, from the source data)

The 2026-11-06 publication announced **1,404** new designations
(処理区分 01). The filter removed:

| Step | Records |
| --- | --- |
| New designations announced on 2026-11-06 | 1,404 |
| Removed: designation date earlier than the publication date (late publications of older companies) | −673 |
| Designated on the publication date itself | 731 |
| Removed: entity types other than 株式会社 (301) / 合同会社 (305) | −52 |
| **This sample (genuinely new companies)** | **679** |

Kept by entity type: 株式会社 468, 合同会社 211. The full disclosure,
including per-prefecture counts, is in `summary.md`.

## Per-field fill counts (measured on the 679 records)

| Field | Filled |
| --- | --- |
| Corporate number （法人番号） | 679 |
| Company name （商号） | 679 |
| Company name, kana （商号カナ） | 673 |
| Entity type （法人種別） | 679 |
| Designation date （指定年月日） | 679 |
| Prefecture （都道府県） | 679 |
| City / municipality （市区町村） | 679 |
| Postal code （郵便番号） | 679 |
| Street address （丁目・番地等） | 679 |

The kana name is the only incomplete field: 6 companies have no kana reading
in the source publication.

## Files

| File | Contents |
| --- | --- |
| `data/enriched_20261106.csv` | All 679 records. UTF-8, **no header row**, 9 columns (schema below). Byte-identical to the product file for 2026-11-06. |
| `summary.md` | The product's own summary: filter conditions, the exclusion counts above, per-prefecture counts, column definitions (Japanese). |
| `manifest.json` | Verification file with a digital stamp (Ed25519) covering the CSV and summary — see "Verify it yourself" below. |
| `regbase-enriched-sample-2026-11-06.zip` | The sample package as a single download: CSV + summary + manifest + Japanese README. |

## Schema (9 columns, in order)

1. `corporate_number` — 13-digit corporate number （法人番号）; import as text to keep leading zeros
2. `name` — company name （商号）
3. `name_kana` — company name in katakana
4. `entity_type` — entity type label （株式会社 / 合同会社）
5. `assignment_date` — designation date (equals the publication date for every row)
6. `prefecture` — prefecture of the registered address
7. `city` — city / municipality
8. `postal_code` — postal code
9. `street_address` — street address （丁目・番地等）

## Verify it yourself

`manifest.json` carries a digital stamp (an Ed25519 signature; format `regbase-manifest/1`).
It lists the SHA-256 hash, byte size and record count of each file, so you can
confirm the files are byte-for-byte what RegBase produced. The signature proves
the files have not changed since signing and were signed with the RegBase key;
it does not vouch for the accuracy of the underlying registry data, which
follows the source publication.

## The product

This sample is one day. The product sells the same file per day (BOOTH) and as
a monthly bundle (Coconala / note):

- BOOTH (single day): https://regbase.booth.pm/items/9114539
- Coconala (monthly bundle): https://coconala.com/services/4493766

## Source and limits

- Source: National Tax Agency corporate-number publication site
  (https://www.houjin-bangou.nta.go.jp/), daily diff data for 2026-11-06.
- No telephone numbers or email addresses: the source publication does not
  contain them.
- No industry/sector column exists in the source data; records cannot be
  filtered by industry.