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 of U.S. publicly listed companies in real time. This article introduces 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 (CEOs, CFOs, directors, and shareholders holding over 10% of 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 scattered across the SEC’s website and provided in raw, unwieldy formats. Insider trading activity is widely regarded as one of the strongest market signals: ・ A CEO purchasing shares out-of-pocket → A bullish signal more reliable than any analyst report. ・ Multiple executives selling simultaneously → A collective “rats leaving the sinking ship” warning. ・ Heavy减持 by hedge funds → An early indicator of shifting institutional confidence. The problem? These filings reside in the SEC’s EDGAR system—disorganized, hard to parse, 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 exactly this problem. What is SEC Insider Feed? A real-time API service that scrapes SEC Form 4 data at five-minute intervals and returns structured JSON. Core capabilities: ・ 🔄 Real-time capture — Polls SEC’s RSS feed every 5 minutes; new filings are ingested and stored within seconds. ・ 📊 Structured data — Pre-processed fields including company name, insider name, transaction code, number of shares, and dollar value—ready for immediate use. ・ 🔍 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 — Compatible with MCP (Model Context Protocol), 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 latest insider filings: 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 our previous discussion on insider trading, we introduced several websites where such data can be viewed. If you missed it, click the link below: How to Check Insider Trading for Chinese-American and U.S. Stocks (Futu and Snowball Are Not Accurate) We 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, we’ll address precisely that. Let’s take NVIDIA (NVDA) as an example. First, visit Insider Cow—the second website we previously recommended—and search for NVIDIA’s most recent insider trades: You’ll see exclusively insider sell transactions. Next, go to J3sg—the third website we recommended—and search again for NVIDIA’s recent insider trades: Under the “Action” column, you’ll notice not only the previously seen AS (Automatic Sale) and S (Sale), but also many additional entries absent from 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.” But what distinguishes AB (Automatic Buy) and AS (Automatic Sell) from ordinary buys and sells? And what does D (“Disposed”)—which appears frequently on the second site but not the first—mean? Moreover, what are GD and GA—codes not even listed in the Action Code legend? To answer all these questions, we must turn to the original source document filed by insiders: Form 4. Take NVIDIA CEO Jensen Huang’s recent insider trading filing as an example—famously precise and well-documented. Click the “Form” button next to any trade record (or directly search “NVDA” on the SEC’s official website to locate submitted Form 4s). Let’s first examine a typical Form 4: The green-highlighted section contains basic personal information—name, title, etc.—which is self-explanatory. Our focus lies instead on Table I (Figure 1) and Table II (Figure 2) below: Table I records non-derivative securities (e.g., common stock), while Table II covers derivative securities (e.g., options or other instruments). Let’s walk through the numbered fields 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 (Sale)—note the form mandates “Purchase,” not “Buy”—there are numerous other codes. For example, F in the figure stands for “Delivery or withholding of shares to satisfy tax obligations arising from the receipt, exercise, or vesting of securities.” That sounds complicated—so let’s simplify. Essentially, 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 sell a portion of the newly granted shares outright. That’s what the “F” code represents.

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