Finqual – Free SEC-based API for fundamentals, insider and 13F data
Clean SEC data API, but Bloomberg Terminal, FactSet, Alpaca, and yfinance already dominate this category.

Aggregates 13F, insider, and congressional trades with a cleaner UI than Dataroma.
Retail investors, finance analysts
Dataroma · WhaleWisdom · Quiver Quantitative
Clean SEC data API, but Bloomberg Terminal, FactSet, Alpaca, and yfinance already dominate this category.
Insider transaction alerts from SEC Form 4, but retail trading signal detection is crowded.
14-component confidence score filters 214 daily filings down to the 5-10 that matter.
Institutional holdings scraper; FactSet and Bloomberg terminals already own this.
Reverse-engineered ICE's hedge fund product in 9 days, but unproven vs. established screeners.
Open-source congressional tracker when Quiver Quantitative and Capitol Trades charge for access.