SEC Insider Feed: Track insider trading of U.S. publicly listed companies in real time via API

Can you find out the moment a CEO starts aggressively selling their company’s stock? On May 20, 2026, we launched SEC Insider Feed — an API service that captures insider trading data for U.S. publicly listed companies in real time. This article explains what this API is, what it can do, and key insights we uncovered using real-world data. What is insider trading data—and why does it matter? U.S. securities law requires corporate insiders—such as CEOs, CFOs, directors, and shareholders holding more than 10% of outstanding shares—to file Form 4 with the SEC within two business days after buying or selling their company’s stock. These filings are public, but they’re scattered across the SEC’s website and provided in raw, unwieldy formats that are difficult to use directly. Insider trading activity is widely recognized as one of the strongest market signals: ・ A CEO purchasing shares with personal funds → A bullish signal far more reliable than any analyst report. ・ Multiple executives selling simultaneously → A collective ‘rat-exit’ warning sign. ・ Heavy institutional减持 (e.g., by hedge funds) → An early indicator of shifting institutional confidence. The problem? These filings reside in the SEC’s EDGAR system—disorganized, inconsistently formatted, and significantly delayed. If you want to know who sold today, you might need to scroll through dozens of web pages. SEC Insider Feed solves this problem. What is SEC Insider Feed? An API service that scrapes SEC Form 4 data at five-minute intervals and returns structured JSON. Core capabilities: ・ 🔄 Real-time capture — Polls the SEC’s RSS feed every 5 minutes; new filings are ingested and stored within seconds. ・ 📊 Structured data — Includes company name, insider name/title, transaction code, number of shares, dollar value—ready to use out of the box. ・ 🔍 Flexible querying — Filter by ticker symbol, insider name, transaction type, or date range. ・ 📡 Real-time push — Server-Sent Events (SSE) streaming interface delivers new filings instantly to your application. ・ 🤖 AI-ready — Supports MCP integration, enabling natural-language queries. Tech stack: Python 3.12 / FastAPI / SQLAlchemy 2.0 async / PostgreSQL 15 / Deployed on Railway API endpoint: https://sec-insider-api.up.railway.app Quick start: 1. Retrieve the latest insider trades: curl -H "X-API-Key: YOUR_API_KEY" \ 'https://sec-insider-api.up.railway.app/v1/filings?per_page=5' 2. Query insider trades for a specific stock: curl -H "X-API-Key: YOUR_API_KEY" \ 'https://sec-insider-api.up.railway.app/v1/tickers/NVDA'

Understanding Form 4—the official SEC insider trading disclosure form

Disclaimer: The analysis and opinions presented in this article reflect solely the author’s subjective commentary and do not constitute investment advice. The author assumes no legal liability for any investment decisions made based on this content. In previous posts, we discussed insider trading and recommended several websites for tracking such activity. If you missed those, please refer to the links below: How to Track Insider Trading for Chinese-Listed & U.S.-Listed Companies (Note: Futu and Snowball data are unreliable) We’ve received private messages asking about discrepancies among sources—specifically, why certain trades appear on one site but not another. Which source should be trusted? Today’s post addresses exactly that. Let’s take NVIDIA (NVDA) as an example. First, visit Insider Cow—the second site we previously recommended—and search for NVIDIA’s most recent insider trades: You’ll see exclusively sell-side transactions by insiders. Next, go to J3sg—the third site we recommended—and search again for NVIDIA’s recent insider trades: Under the “Action” column, you’ll notice additional entries beyond the AS (Automatic Sale) and S (Sale) codes seen earlier—including many not displayed on the first site. What do these mean? Scroll further down the page to find J3sg’s explanation of Action Codes: Here, B and S are straightforward—Buy and Sell, respectively. But what distinguishes AB (Automatic Buy) and AS (Automatic Sale) from ordinary buys and sells? And what does D (Disposed), which appears frequently on the second site but not the first, actually signify? Moreover, what are GD and GA—codes absent from the Action Code legend altogether? To answer these questions, we must turn to the original source document filed by insiders: Form 4. Take NVIDIA CEO Jensen Huang (“Old Huang”), renowned for his precise execution, as an example. Click the “Form” button next to any of his trade records (or alternatively, go directly to the SEC’s EDGAR database and search for NVDA to view submitted Form 4s). Let’s examine a typical Form 4: The green-highlighted section in the form is self-explanatory—it contains basic personal information like name and title. Our focus lies instead on Table I (Figure 1) and Table II (Figure 2): Table I records non-derivative securities (e.g., common stock), while Table II covers derivative securities (e.g., options or other instruments). We’ll walk through each numbered field in the figure: 1: Security type—for instance, “common stock” (most frequent), “preferred stock,” etc. Most cases involve common stock. 2: Transaction date 3: Transaction code—this is the most critical field. Beyond standard P (Purchase) and S (Sell)—note that the form mandates “Purchase,” not “Buy”—there exist numerous other codes. For example, the “F” shown here stands for “Delivery or withholding of shares to satisfy tax obligations arising from the receipt, exercise, or vesting of securities.” Does that sound confusing? Put simply: Jensen Huang previously received shares—whether via equity incentives or other means—and under U.S. law, such grants trigger tax liabilities. To settle those taxes, he elected to have a portion of the newly granted shares automatically sold off. That’s a much more intuitive way to understand it, isn’t it?

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