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🇯🇵 Japan EDINET Insider Filings — 5% Rule (大量保有報告書) & Buybacks

Sweep Japan's insider-flow disclosures directly from the FSA's EDINET API v2: large-shareholder reports (大量保有報告書) and change reports (変更報告書) under the 5% rule, plus treasury-share buyback (自社株買い) filings — the canonical ownership and insider-activity records mandated by Japan's Financial Instruments and Exchange Act (金融商品取引法). Filter by date window, filer name, or 4-digit TSE ticker, and optionally enrich each filing with parsed XBRL so you get holding percentages, share counts, and change deltas instead of just document metadata. Free FSA EDINET key required.

• ✅ Official FSA EDINET REST API v2 (api.edinet-fsa.go.jp) — structured JSON, no HTML scraping
• ✅ 5% rule register: large-shareholder reports + change reports
• ✅ Treasury-share buyback (自己株券買付状況報告書) coverage
• ✅ Optional XBRL enrichment → holdings %, shares, change delta
• ✅ Filter by date, filer, or 4-digit TSE ticker

A low-cost, programmatic data source for Japan's insider and shareholder disclosure register — clean JSON you can plug straight into a research, surveillance, or compliance pipeline.

Use cases

• Event-driven / activist research — track 5%+ stake builds and changes (大量保有報告書 / 変更報告書) in Japanese names.
• Compliance surveillance — monitor large-holding and concert-party disclosures for counterparties during onboarding and ongoing review.
• Quant signals — derive features from treasury-buyback announcements and ownership-change deltas.
• Cross-shareholding tracking — follow keiretsu cross-holding unwinds, each of which files as a change report.

Inputs

Example input

{
"apiKey":"YOUR_EDINET_V2_KEY",
"doc_type":"large_shareholder",
"date_from":"2026-05-22",
"date_to":"2026-05-29",
"issuer_ticker":"7203",
"max_filings":25,
"enrich_xbrl":true
}

Example output (one row)

{
"doc_id":"S100ABCD",
"filing_date":"2026-05-27",
"doc_type":"large_shareholder",
"doc_type_code":"350",
"doc_type_jp":"大量保有報告書",
"doc_type_en":"Large Shareholding Report",
"filer_name_jp":"○○アセットマネジメント株式会社",
"filer_name_en":"XX Asset Management Co., Ltd.",
"issuer_name":"トヨタ自動車",
"issuer_ticker":"7203",
"edinet_code":"E02144",
"holdings_pct":5.12,
"holdings_shares":167000000,
"change_pct":1.04,
"large_shareholder":true,
"large_shareholder_change":false,
"treasury_buyback":false,
"data_source":"edinet_api_v2_xbrl",
"doc_url":"https://api.edinet-fsa.go.jp/api/v2/documents/S100ABCD?type=1"
}

XBRL-derived fields (holdings_pct, holdings_shares, change_pct) may be null when enrich_xbrl is off or the XBRL element is unparseable.

doc_type_code reference

Getting your free EDINET API key

1. Visit https://api.edinet-fsa.go.jp/
2. Click APIキーを発行する (Issue API key).
3. Enter email + phone (SMS code is for fraud prevention only).
4. Confirm via the verification email.
5. Copy the 40-char key from your dashboard.

Rate limit: ~3 requests/second per key. The actor never logs or persists the key and sends it only to api.edinet-fsa.go.jp.

FAQ

What's the 5% rule? Any holder crossing 5% of a TSE-listed company's voting shares must file a large-shareholding report (大量保有報告書) to the FSA within 5 business days; later moves of ≥1% trigger change reports (変更報告書).

Do I need an EDINET key? Yes — a free FSA EDINET API v2 subscription key (no fee, no card).

Does it parse XBRL? Yes — enrich_xbrl (default on) extracts holdings %, shares, and change delta from the filing's XBRL instance.

Which document types are covered? Large-shareholder reports, change reports, and treasury-share buyback reports (officer/periodic reports via doc_type=officer_trade).

How far back does EDINET go? Roughly 5 years of retained filings via the API.

日本語の説明

金融庁(FSA)の EDINET API v2 から、日本のインサイダー・株主開示を直接取得します。5%ルールに基づく大量保有報告書・変更報告書、および自己株券買付状況報告書(自社株買い)を対象とし、提出日・提出者名・4桁の証券コードで絞り込めます。enrich_xbrl を有効にすると、各報告書の XBRL を解析し保有割合・株式数・変動率を付与します。無料の EDINET API v2 サブスクリプションキーが必要です。

Related actors — APAC market-disclosure / exchange-filings family

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