The13f MCP server

the13f-mcp

Model Context Protocol server for the13f. Brings

institutional 13F intelligence into Claude Desktop, Cursor, VS Code +

Continue, and any MCP-compatible host — no HTTP code required on your side.

Important limitations

Research data only. Sourced from publicly disclosed SEC Form 13F filings, which lag quarter-end by up to 45 days. Past institutional positioning does not predict future performance. Nothing here constitutes investment advice. Every tool's response includes a disclaimer field; the host LLM should surface it alongside any analysis it produces.

Install

uvx the13f-mcp

Or pip install the13f-mcp if you prefer to manage Python environments yourself. Python 3.11+ required.

Get a free API key

Free, no payment, no credit card:

1. Visit
2. Enter your email and solve the Cloudflare Turnstile challenge
3. Copy your pf13f key — shown once**
4. Paste it into your MCP host's config as THE13FAPIKEY (see below)
5. Restart the host

Free tier: 100 read calls per day; quota rolls at UTC midnight. Signal and report tools arrive in later minor versions when paid tiers launch.

Configure your MCP host

Claude Desktop

Edit ~/Library/Application Support/Claude/claudedesktopconfig.json (macOS) or %APPDATA%/Claude/claudedesktopconfig.json (Windows):

{
  "mcpServers": {
    "the13f": {
      "command": "uvx",
      "args": ["the13f-mcp"],
      "env": {
        "THE13F_API_KEY": "pf13f_..."
      }
    }
  }
}

Restart Claude Desktop. The13f tools should appear in the MCP tool list.

Cursor

Settings → MCP → Add Server. Paste the same JSON block into the "Custom" field.

VS Code with Continue

Settings → experimental.modelContextProtocolServers → add a stdio transport running uvx the13f-mcp with THE13FAPIKEY in env. The key reveal page at shows a copy-paste-ready snippet with the key already filled in.

Available tools — v0.1.0 (Read tier, free)

Planned tools — later versions

The free-tier Read tools are enough to explore the data and build prompts against it. Signal and report tools deliberately wait on the paid-tier billing plumbing.

Example prompts

"Pull Berkshire Hathaway's top 20 positions as of Q4 2025 and summarize

what grew the most quarter-over-quarter."

"I own AAPL, MSFT, and NVDA equal-weight. Find the 5 institutional

managers whose portfolios most closely resemble mine."

"What sector did 13F filers most aggressively reduce last quarter? Show

me the top three managers leading the reduction."

The MCP host's LLM picks the right tool, fills in arguments, surfaces the disclaimer, and returns the result as structured JSON.

Environment variables

Shortened. The full README is on GitHub.