What is StockFit API?

StockFit API is a structured data platform that delivers financials, ownership, ETF holdings, and SEC filings for US equities—all sourced directly from official SEC XBRL filings. Every number is point-in-time accurate, timestamped to its original filing, and fully traceable. The API covers income statements, balance sheets, cash flow statements, earnings calendars, insider and institutional ownership, ETF portfolio composition, business model classifications, executive compensation, and more. Data is updated daily from SEC EDGAR and served through a simple REST API with clear JSON responses.

Who it's for

• Quantitative researchers – who need normalized, point-in-time financial data without look-ahead bias for backtesting and signal generation.
• Investment analysts – who want traceable ownership flows, insider transactions, and quality scores like Altman-Z and Piotroski-F to evaluate companies.
• Fintech and research tool builders – who require comprehensive SEC filing coverage, earnings calendars, and ETF overlap analysis to power their own applications.

Key features

Financials API

Income statement, balance sheet, and cash flow statement data parsed directly from raw XBRL without adjustments. Growth rates, health scores, and chart-ready time series are included, with every value traceable back to its underlying 10-K or 10-Q filing.

Ownership API

Institutional and insider transaction flows in a single view. Covers 13F holders, beneficial owners, Form 3/4/5 transactions, and share class data, making it easy to track who is buying or selling.

ETF Holdings API

Full look-through and overlap analysis using NPORT-P filings. Includes portfolio composition, fund flows, fee history, and AI exposure models for understanding ETF positioning.

SEC Filings API

Access to 10-K, 10-Q, 8-K, DEF 14A, S-1 IPO offerings, Forms 3/4/5, and more. Features a predicted filing calendar, section extraction, and search by ticker, CIK, CUSIP, FIGI, or company name.

What stands out

"Every value timestamped to its SEC filing – no adjusted metrics, no look-ahead bias."

This commitment to raw, traceable data sets StockFit API apart from providers that adjust or smooth financials. Quants and researchers can trust that historical values reflect exactly what was reported at the time, enabling accurate backtesting and signal construction without contamination from restatements or retroactive changes.

Worth checking out if…

You need reliable, point-in-time SEC data for US equities and ETFs, especially if you are building backtesting models, researching insider and institutional ownership patterns, or developing tools that require traceable financial statements and filing calendars.