Sec 13f

live Security

SEC 13F — institutional ownership, asked security-first.

3 tools
0ms auth
free tier 50 calls/day

Tools

who_owns

Which institutional managers hold a given US-listed security, ranked by position size — the reverse of every 13F API, which requires you to name the manager first. Give a company name, ticker or CUSIP

No parameters required.

▶ Try it
manager_portfolio

Every 13F position reported by one institutional manager, largest first — the classic manager-first view, over the same hosted table. Give the manager name ("Berkshire Hathaway", "Pershing Square"). R

No parameters required.

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holdings_coverage

What this 13F dataset currently covers: the SEC release window loaded, how many filings and holdings are in it, and the reporting quarter. Use to check freshness before relying on an ownership answer.

No parameters required.

▶ Try it

Test with curl

The gateway speaks JSON-RPC 2.0 over HTTP POST. You can test any pack directly from the terminal.

List available tools
bash 
curl -X POST https://gateway.pipeworx.io/sec-13f/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
Call a tool
bash 
curl -X POST https://gateway.pipeworx.io/sec-13f/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"who_owns","arguments":{}}}'

Use with the SDK

Install @pipeworx/sdk to call tools from any TypeScript/Node project.

TypeScript 
import { Pipeworx } from '@pipeworx/sdk';
const px = new Pipeworx();
const result = await px.call("who_owns", {});
ask_pipeworx 
// Or ask in plain English:
const answer = await px.ask("sec 13f — institutional ownership, asked security-first");