Sec 13f

live Security

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

6 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 (e.g. "N

No parameters required.

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manager_portfolio

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

No parameters required.

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manager_changes

What one institutional manager NEW-ed, EXITED, INCREASED or DECREASED between two 13F quarters — the newsletter primitive: a portfolio snapshot is not news, a change is. Give the manager name; optiona

No parameters required.

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security_flows

Net institutional buying or selling of one security across the loaded 13F quarters — total position value and holder count per quarter, plus which managers newly bought, sold out, added to or trimmed

No parameters required.

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manager_profile

A profile of one institutional manager's 13F book: portfolio concentration (share of value in the top 5 / top 10 positions), turnover between the two most recent loaded quarters, and top positions. Us

No parameters required.

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holdings_coverage

What this 13F dataset currently covers: which SEC release windows and reporting quarters are loaded, how many filings and holdings rows are in each, and total size. Use to check freshness and to know

No parameters required.

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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");