# Signal8

> SEC filing intelligence for US public companies — insider trades (Form 3/4/5), institutional holdings (13F), congressional stock trading (STOCK Act), ETF holdings, and material event tracking. Free to use; data is paywall-free behind a no-cost account.

## Companies
- [Company directory](https://signal8.ai/companies): Browse US public companies with SEC filing intelligence
- [Company profile](https://signal8.ai/companies/{exchange}:{ticker}): Per-ticker overview with financials, insiders, institutions, filings, and news (e.g. /companies/NASDAQ:AAPL)

## Insiders (SEC Form 4)
- [Insider directory](https://signal8.ai/insiders): All SEC corporate insiders with recent Form 3/4/5 activity
- [Insider profile](https://signal8.ai/insiders/{cik}): Per-insider transaction history across all issuers

## Institutions (SEC 13F)
- [Institutional directory](https://signal8.ai/institutions): 13F filers ranked by AUM, holdings count, and quarterly position changes
- [Institution profile](https://signal8.ai/institutions/{cik}): Per-institution portfolio, AUM, and quarterly filings

## Politicians (STOCK Act)
- [Congressional traders](https://signal8.ai/politicians): U.S. senators and representatives ranked by recent trading activity
- [Politician profile](https://signal8.ai/politicians/{slug}): Per-politician trade history and filing-delay analysis

## ETFs
- [ETF directory](https://signal8.ai/etfs): Listed ETFs with holdings, sector weightings, and performance
- [ETF profile](https://signal8.ai/etfs/{exchange}:{ticker}): Per-ETF holdings, dividends, and performance

## SEC Filings & News
- [SEC Filings](https://signal8.ai/sec-filings): Real-time SEC filing feed across all US issuers
- [News](https://signal8.ai/news): Aggregated company news linked to filings
- [Calendar](https://signal8.ai/calendar): Earnings, IPO, and material-event calendar

## API Reference
- [Developer docs](https://signal8.ai/developer/docs): Browsable REST API reference with per-endpoint pages, tier requirements, and examples
- [API endpoint catalogue (JSON)](https://api.signal8.ai/api/v1/public/catalog): Live, keyless machine-readable catalogue of every public endpoint

## MCP Server
- [MCP Server](https://signal8.ai/mcp): Human-facing overview + one-click setup for connecting Signal8's MCP server to Claude, Cursor, and other MCP clients
- [Hosted MCP server](https://mcp.signal8.ai/mcp): Streamable-HTTP MCP endpoint (Bearer auth) exposing Signal8 tools to Claude, Cursor, and other MCP clients
- [Local MCP server](https://signal8.ai/developer/docs): Run with `npx @signal8ai/mcp` (stdio transport, SIGNAL8_API_KEY env) — setup guide in the docs

## Methodology & Glossary
- [PFD methodology](https://signal8.ai/methodology/pfd): How politician net-worth brackets and financial disclosures are derived

## About
- [Pricing](https://signal8.ai/developer/pricing): Plans (free tier covers most data)
- [Contact](https://signal8.ai/contact): Support and inquiries
- [Privacy](https://signal8.ai/privacy)
- [Terms](https://signal8.ai/terms)