ko.io — SEC 13F Holdings, Insider Trades & Congress Trading Data

# ko.io > Financial data infrastructure for AI agents and developers. Source-traced SEC > and U.S. federal data -- 13F institutional holdings, insider (Form 3/4/5) > trades, congress (STOCK Act) trading, stock fundamentals, fails-to-deliver, > and macro indicators -- served via REST API and an MCP server. Every number > traces back to the underlying SEC filing. Coverage: SEC 13F holdings 2013Q2 to present (85M+ position rows, 11,000+ institutions, quarterly), Form 4 insider transactions (11M+ rows, daily), congress STOCK Act disclosures, XBRL fundamentals for 6,500+ US tickers, plus Treasury / Fed / BLS / EIA / CFTC / FDIC macro series. ## API - [API documentation](https://ko.io/docs/): REST API reference. Base URL https://api.ko.io/api/v1/. Add ?demo=true to any endpoint for keyless trial access. - [OpenAPI spec](https://ko.io/openapi.yaml): machine-readable API schema. - [Data reference](https://ko.io/datasets/): every dataset with fields, coverage, and example payloads. - [Pricing](https://ko.io/pricing/): free and paid tiers. ## MCP server - [MCP setup](https://ko.io/mcp/): connect Claude, Cursor, or any MCP client to https://mcp.ko.io/mcp (Streamable HTTP, 24 tools: list_institutions, get_institution_holdings, get_stock_profile, get_stock_holders, get_stock_activity, get_stock_price, get_stock_financials, get_insider_trades, list_insider_traders, get_congress_trades, get_congress_member, get_crypto_exposure, get_crypto_holders, get_crypto_holder, sec_list_filings, sec_get_filing_index, sec_get_filing_document, get_ftd_data, get_form144_notices, search, get_treasury_yields, get_fed_rates, get_economic_indicators, get_financial_stress). ## Data pages Entity URL patterns (all server-rendered with data tables and JSON-LD): - Stocks: https://ko.io/stock/{TICKER}/ (institutional holders, e.g. /stock/AAPL/) - Institutions: https://ko.io/institution/{slug}/ (13F portfolio, e.g. /institution/berkshire-hathaway-inc-1067983/) - Insider activity by company: https:

openapi: 3.1.0 info: title: ko.io Financial Data API description: | Source-traced SEC and market data for AI agents and quants: 13F institutional holdings, Form 4 insider trades, congressional trades, spot crypto-ETF exposure, stock fundamentals, prices, macro economics, and the EDGAR source-document gateway. 200M+ records from SEC EDGAR, updated daily. Auth: send your key as 'Authorization: Bearer ko_live_...'. Most data endpoints also accept '?demo=true' for a keyl