StockFitAPI

StockFit API is a REST data feed for US stock, ETF, and mutual fund (fund) research—covering company financial statements, ownership, insider activity, and SEC filings, plus ETF holdings and related fund analytics. It’s designed to help you build trading terminals, investment apps, quant platforms, and AI-powered research workflows using structured data drawn from official SEC XBRL filings.

Core capabilities include income statement, balance sheet, and cash flow endpoints parsed directly from raw XBRL, along with an SEC Filings API for 10-K, 10-Q, 8-K, DEF 14A, and S-1 IPO prospectuses, as well as Forms 3/4/5 for insider transactions. For ownership research, you can pull institutional ownership (13F), beneficial owners (Schedule 13D/13G), and insider flows (Form 3/4/5). For funds and ETFs, you can access daily ETF holdings (plus quarterly holdings from NPORT-P), including look-through and overlap analysis and fund-flow/fee insights.

A key focus is point-in-time accuracy: values are timestamped to the SEC filing, with an audit trail for every number and coverage that includes each quarter/year, including delisted companies—helpful when you need deterministic, no-lookahead data for backtesting. The API is also “AI-ready,” including an MCP-native workflow so your API key can be treated as an AI tool.

Pricing-wise, there is a free tier available with a free API key and no credit card required. Paid plans unlock additional endpoints such as insider transactions, institutional ownership, executive compensation, and ETF analytics.

What data can I pull with StockFit API?

You can retrieve SEC-sourced fundamentals (income statement, balance sheet, cash flow), SEC filings (10-K/10-Q/8-K, DEF 14A, S-1, Forms 3/4/5), ownership (13F and beneficial owners), and ETF holdings (daily holdings plus quarterly NPORT-P holdings).

Is StockFit a SEC filings API or more than filings?

It’s both. SEC filings are a primary source, and the API also exposes parsed financial statements, earnings-related data, ownership, and ETF/fund holdings and analytics.

Does StockFit provide as-reported (unadjusted) financials?

Yes. It provides financial statements parsed directly from SEC XBRL without adjustments, with values traceable to the underlying 10-K or 10-Q filing.

How does StockFit support point-in-time backtesting?

Values are timestamped to their SEC filing and include an audit trail for each number, helping you avoid look-ahead and survivorship bias when building time-accurate backtests.

Can I use StockFit with AI assistants?

Yes. StockFit supports connecting to an AI assistant via MCP (for example, Claude, Cursor, or VS Code), where your API key becomes an AI tool.

Is there a free tier and what does it include?

Yes. You can get a free API key with no credit card required. The free tier includes company details, financial statements, filings, and more with generous rate limits, while paid plans unlock additional endpoints like insider transactions, institutional ownership, executive compensation, and ETF analytics.