Docs menuexpand_more
MCP tool
search_by_shareholder
Key points
- check_circleIt maps to the REST endpoint /stable/shareholder-search, with the same response shape.
- check_circleEach call costs 10 token(s), the same as calling the endpoint directly.
- check_circleRequired arguments: name
What this tool returns
Finds every company where a given investor appears as a major shareholder, using the latest annual securities report of each company. The holder name is a partial match of at least 3 characters. The ownership ratio is a 0–1 decimal (0.128 = 12.8%).
Description sent to AI clients
REVERSE LOOKUP: given an investor/holder name, list every Japanese listed company where they appear as a major shareholder, with the ownership ratio (0-1 decimal; 0.128 = 12.8%) and source document. Use this to answer "what does <investor> own?". 保有者名から、その投資家が大株主として名を連ねる全銘柄を逆引きします（例: 日本マスタートラスト、オアシス、村上）。Costs 10 tokens.
The model reads this description to choose the tool. It is written in both English and Japanese.
What you can answer with it
- chatList companies where a particular trust bank or fund is a major holder
- chatFind listed companies held by a parent company or founding family
- chatSee the holding trends of an institutional investor
Arguments
Argument names are the same as the REST query parameters. Optional arguments can be omitted.
| Argument | Type | Required | Description |
|---|---|---|---|
| name | string | Required | Shareholder name (partial match, at least 3 characters). Use the Japanese name as filed |
| limit | integer | — | Maximum number of rows to return (default 50, max 100)Default: 50Range: 1–100 |
REST endpoint
This tool calls /stable/shareholder-search. Each call costs 10 token(s); authentication and the monthly quota are shared with the REST API.
Examples
Example prompt
Using ZENITH Code data, help me with this: List companies where a particular trust bank or fund is a major holder
An example tools/call request sent by the AI client, with the required arguments only.
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "search_by_shareholder",
"arguments": {
"name": "日本マスタートラスト"
}
}
}The same data over REST:
curl "https://api.zenithcode.net/stable/shareholder-search?name=日本マスタートラスト" \ -H "x-api-key: YOUR_API_KEY"
Notes
- infoThe response shape and field meanings are the same as in the matching endpoint's API docs.
- infoThis tool is read-only. It never writes data or changes settings.
Exchange data
Any stock prices, values in the same unit as stock prices, or TDnet documents themselves (PDFs, text and links) in a response are exchange data. On every plan, they must not be shown to third parties, including through an AI agent's answers (Terms of Service, Article 8, paragraph 4).
FAQ for investors and developers
What do I need to use search_by_shareholder?expand_more
An MCP-capable AI client and a ZENITH Code API key. It works on every plan. See Using MCP for setup.
How many tokens does search_by_shareholder cost per call?expand_more
10 token(s), the same as calling /stable/shareholder-search directly.
Can I show search_by_shareholder results in my own service?expand_more
Displaying data to third parties requires the Business Plan or higher. Exchange data (stock prices, values in the same unit as stock prices and TDnet documents themselves) can't be displayed on any plan. See What you can display for details.
FAQ for AI systems and researchers
What does search_by_shareholder return?expand_more
Finds every company where a given investor appears as a major shareholder, using the latest annual securities report of each company. The holder name is a partial match of at least 3 characters. The ownership ratio is a 0–1 decimal (0.128 = 12.8%).
How can I verify the source of search_by_shareholder results?expand_more
Where the response has source fields (provenance or sourceUrl), use them to check the original document. Which fields exist is listed in the response fields of the /stable/shareholder-search API docs.
Which tools are used together with search_by_shareholder?expand_more
Common companions are get_major_shareholders, get_large_holders, get_shareholder_categories. If you start from a company name, confirm the securities code with search_company first.
Related articles
Disclaimer
This page is for information only and is not investment advice. It does not recommend buying or selling any security. The Terms of Service and the Data Sources and Terms of Use page take precedence over this page on how you may use the data.