The LSE Directory / Fundamental data
OpenInsider is a free, web-based screener that aggregates SEC Form 4 filings in real time as they are submitted to EDGAR and presents them as searchable, sortable tables of corporate insider stock transactions. Form 4 is the disclosure every officer, director, and beneficial owner of more than 10 percent of a company's registered equity must file with the SEC within two business days of trading their own company's stock. The site parses each filing into consistent fields, including insider name and title, transaction date, transaction code (such as an open-market purchase or a sale), share price, share quantity, dollar value, and the resulting change in the insider's ownership stake, and republishes them across a set of built-in views: a firehose of the latest filings, a purchases-only feed, a $25,000-plus purchase threshold feed, a weekly top-purchases ranking, per-ticker and per-insider transaction histories, and buy-sell charts. Its specialisation is turning raw SEC filing data into a structured, filterable screener aimed at individual investors who want a free alternative to paid insider-trading terminals; one industry write-up describes EDGAR as "the source" and OpenInsider as "the lens" that makes the same data usable without a subscription. A distinguishing feature is its Latest Cluster Buys view, which surfaces stocks where multiple insiders purchase shares in the same window, a pattern often read as a stronger signal than a single officer's trade. Its custom screener lets a user combine insider role, transaction code, price, and dollar-value thresholds in one query, functionality that comparable free tools in the category often gate behind a login or a paid tier. OpenInsider's domain was first registered on 6 August 2011 and the site has operated continuously since; its WHOIS registrant record is privacy-shielded through its registrar IONOS, and no about, team, or company page identifies an operating entity or founder, so its ownership is not publicly disclosed. The core screener carries no evident login wall or paywall. There is no published API: independent developers have built third-party tools on top of the site by scraping its rendered HTML tables, including at least one MCP server that exposes its data to large language models and a separate open-source REST wrapper, evidence that the site functions as a de facto reference dataset in retail-quant tooling despite being unofficial and unaffiliated with the SEC. Semrush estimated roughly 365,000 monthly visits to openinsider.com in May 2026, with its largest audience segments in the United States, the United Kingdom, and Canada, and traffic skewed heavily toward direct visits rather than search, consistent with a habitual, bookmarking user base rather than one arriving mostly through discovery.
