Documentation

Japan Finsight connects your AI (Claude, ChatGPT, Cursor, or Claude Code) to Japan's corporate disclosure record. Once connected, you can ask one question across the whole record: annual reports and top-10 shareholder registers back to fiscal 2018 with year-over-year holder changes, 5%+ stake filings, buybacks, tender offers, from 3,800+ listed companies. All in English, all structured. See coverage for how far back each type of filing goes.

Get connected

Setup takes a few minutes. You'll need your API key: it arrives in a personal email from the founder within 24 hours of subscribing. Every subscription carries a 14-day money-back guarantee. Pick the tool you already use:

• Connect Claude: Claude.ai in your browser (easiest, nothing to install), or the Claude Desktop app
• Connect ChatGPT: in your browser, on any paid ChatGPT plan
• Connect Cursor: for engineers, inside the Cursor editor
• Connect Claude Code: for engineers, in the terminal

Not sure what MCP is? You don't need to know to get connected. The MCP guide explains what happens under the hood and shows what you can ask once you're in.

Reference

• Tools: every public tool, parameters, return shape
• Coverage: every type of filing we ingest, what we extract, and how far back each goes
• Data sources: EDINET API, edinet-tools library, parser methodology

Other

• Changelog: shipped features and fixes

Stuck anywhere? Email data@japanfinsight.com and describe where you got stuck. The founder answers within 24 hours.