I need a service to find insider trading activity.

If you mean a service that tracks corporate insider buying and selling—CEO/CFO/director transactions reported on SEC Form 4—these are good options:

• OpenInsider — best free option for quickly screening recent insider purchases, including cluster buying. It links directly to the underlying SEC filings.
• InsiderAct — better if you want the service to filter the noise and identify things like C-suite purchases, cluster buys, and potential signals, with alerts.
• Quiver Quantitative — useful if you want insider activity alongside Congressional trading and other alternative data.
• Finviz — convenient if you already use it for stock screening and want insider data incorporated into a broader stock-analysis workflow.
• SEC EDGAR — the authoritative, free source. You can search Form 4 filings directly, although it's much less convenient for screening and alerts.

My recommendation

If you're looking for “tell me when insiders are making unusually large or meaningful purchases”, I'd start with InsiderAct or OpenInsider.

If you tell me your budget—free, <$20/month, or professional—I can narrow it down to the best 2–3 services and compare alerts, cluster buying, historical data, mobile access, and API availability.

Several great services track and screen SEC Form 4 insider trading activity, ranging from completely free raw scanners to advanced analytical dashboards.

Top Insider Trading Trackers

• OpenInsider — Best Free Screener
  A straightforward, highly customizable, and completely free web-based tool that lets you filter insider buying and selling activity by ticker, transaction type (e.g., cluster buying, open-market purchases), position, and date range.
• Quiver Quantitative — Best for Alternative Data & Strategies
  Known for tracking unconventional market signals, Quiver provides an intuitive insider trading dashboard alongside tools that score insider purchases and help backtest trading strategies. They also famously track congressional trading data.
• Unusual Whales — Best for Active Traders
  A comprehensive trading platform that bundles insider Form 4 filings alongside real-time options flow, dark pool data, and politician trades, allowing you to cross-reference multiple data streams in one place.
• SEC Form 4 — Best Dedicated Feed
  A clean platform focused specifically on delivering timely updates and alerts regarding corporate insider transactions and institutional holdings.
• Insider Screener — Best for Global/Simple Monitoring
  A user-friendly platform tailored for retail and professional investors who want simple interfaces, customizable screens, and daily alerts on insider buying.

Are you looking for a free basic screener just to look up tickers, or do you need real-time alerts and advanced analytics?

If you mean tracking legal insider buying/selling by corporate executives, directors, and major shareholders, there are several good services.

• Best free: OpenInsider

— excellent for quickly screening SEC Form 4 filings, including large purchases and clusters of insiders buying the same stock.

• Best for alerts + broader data: quiverquant.com — tracks insider purchases/sales and offers alerts through its premium service. It also combines insider data with other alternative datasets.
• Best for serious screening: Fintel — useful if you want insider transactions alongside institutional ownership, short interest, and other stock data.
• Best official source: sec.gov — the underlying SEC Forms 3, 4, and 5 data. It's free but much less convenient for day-to-day monitoring.

What I'd choose

If you're an individual investor, I'd start with OpenInsider + Quiver:

OpenInsider → find unusual/large insider purchases Quiver → monitor them and get alerts SEC → verify the original filing

One important point: insider buying is generally more informative than insider selling. Executives sell for many reasons (taxes, diversification, compensation plans), whereas an open-market purchase with their own money is a more direct expression of conviction. Also, Form 4 transactions generally have to be reported by the end of the second business day after the transaction.

If you tell me your budget (e.g. free / under $20 per month / willing to pay $50+) and whether you want alerts, historical analysis, or an API, I can narrow it down to the best 2–3 services.

To find and track insider trading activity, you have a variety of services ranging from free, raw government databases to advanced, feature-rich stock screeners with real-time alerts. Corporate insiders (officers, directors, and 10%+ owners) are legally required to report their trades via SEC EDGAR Form 4 within two business days.

Here are the best services categorized by what they do best:

Free & Raw Data Scanners

• OpenInsider: A legendary, bare-bones, and completely free web scanner. It lets you filter insider purchases and sales by specific parameters (e.g., cluster buying, market capitalization, transaction type).
• SEC EDGAR: The official government database. You can search any ticker symbol directly on the SEC EDGAR Search System and filter for Form 4 filings to see primary-source data for free.

Advanced Screeners & Analytics

• Insider Screener: Excellent for cleanly monitoring international and domestic Insider Screener purchase data with intuitive tables.
• SECForm4.com: Real-time tracking of insider trading, institutional holdings, and visual buy/sell ratios to gauge overall market sentiment.

Modern & Cross-Market Tools

• Unusual Whales: Great if you want to cross-reference insider trades alongside options flow, dark pool prints, and congressional trading data.
• Quiver Quantitative / Capitol Trades: Exceptional platforms if you want to expand your scope beyond corporate insiders to also track Quiver Quantitative and Capitol Trades congressional stock disclosures.

If you tell me whether you are looking for a free tool , a mobile app , or advanced features like real-time alerts , I can narrow down the best specific platform for your trading style.

You can find insider trading activity using the OpenInsider screener for a fast, free option, or platforms like Finviz and SECForm4.com for detailed tracking.

Top Services for Tracking Insider Trading

• OpenInsider : A free, fast, and simple tool that focuses exclusively on insider data, making it easy to search for specific cluster buys.
• Finviz : Offers a popular insider trading screener that lets you cross-reference executive stock sales and purchases with broader fundamental and technical stock data.
• SECForm4.com : Tracks real-time SEC Form 4 filings, institutional holdings, and buy/sell ratios to help gauge market sentiment.
• Quiver Quantitative : Provides an Insider Trading Dashboard that aggregates corporate disclosures and offers alerts on major executive trades.
• InsiderScore (VerityData) : An institutional-grade platform designed for advanced analytics, professional portfolio monitoring, and deep-dive filing insights.

Would you prefer a free tool for basic tracking or an advanced platform with real-time alerts and analytics?

If you mean legal/publicly disclosed insider transactions by CEOs, directors, officers, and major shareholders, there are several good services:

• openinsider.com — probably the best free starting point. It screens SEC Form 4 filings and lets you filter for recent purchases, transaction size, insider title, etc.
• quiverquant.com — better if you want a dashboard, alerts, historical analysis, and other alternative datasets. Its insider dashboard tracks purchases/sales and estimated transaction values.
• whalewisdom.com — particularly useful if you want to combine insider transactions with institutional/hedge-fund holdings (13F). It has Form 4 data going back many years.
• sec.gov — the official source, completely free, but much less convenient for screening. Form 4 filings are the key filings for changes in insiders' beneficial ownership.

What I'd choose

If your goal is “show me stocks where insiders are buying aggressively”, I'd start with OpenInsider.

If you want something more sophisticated—e.g. “alert me when multiple executives buy their company's stock, filter out options/compensation transactions, rank the purchases by conviction, and backtest the strategy”—I'd look at a paid analytics platform.

One important distinction: not every Form 4 transaction is a meaningful insider bet. Option exercises, grants, tax withholding, and automatic selling can create lots of noise. Actual open-market purchases are generally the first thing I'd screen for.

If you tell me whether you're looking for free, best overall, or professional-grade/API, I can narrow it down to the 2–3 services I'd use.

If you mean a service that tracks legal corporate insider buying/selling reported to the SEC, there are several good choices:

• OpenInsider — probably the best free starting point. It lets you screen Form 4 filings, including recent purchases, sales, large transactions, and cluster buying.
• Quiver Quantitative — better if you want alerts and broader alternative data alongside insider transactions. Its insider dashboard supports ticker-based searches and recent transaction tracking.
• SEC EDGAR — the official source, completely free. You can search Section 16 insider filings directly, although the interface is much less convenient for screening.
• Finviz Elite — useful if you already use Finviz for stock screening and want insider activity integrated into your broader workflow.
• Dedicated Form 4 alert services — worth considering if you want email/real-time alerts rather than manually checking filings. Current services include Form4.ai and InsiderTradeAlerts, among others.

What I'd choose

Free: OpenInsider + SEC EDGAR Best for alerts: Quiver or a dedicated Form 4 alert service Best for serious research: Combine an insider screener with SEC EDGAR so you can verify the original filing.

One important distinction: insider selling is often less informative than insider buying. Executives sell for taxes, diversification, compensation plans, etc.; a sizable open-market purchase with multiple insiders buying around the same time can be a more interesting signal.

If you tell me your budget (free / <$20 / <$50 / professional) and whether you want alerts, a stock screener, or an API, I can narrow it down to the best 2–3 services.

To track legal insider trading activity (Form 3, 4, and 5 filings submitted to the SEC by corporate officers, directors, and major stakeholders), several reputable platforms provide organized, user-friendly data ranging from free summaries to advanced analytics:

• Official Source (Free): Use the SEC EDGAR Database to look up raw Form 4 filings directly from the source . While completely free and authoritative, the raw interface can be cumbersome to parse.
• Free & Comprehensive Trackers:
  • Platforms like Yahoo Finance offer dedicated insider transaction tabs for individual stock tickers, making it easy to see recent open-market buys and sells at no cost.
  • Specialized aggregators like Insider Tracking provide free rolling reports, sentiment indicators, and alerts spanning US and Canadian markets.
• Advanced & Alternative Data:
  • Quiver Quantitative tracks insider trading alongside alternative datasets like congressional trading and institutional holdings.
  • Professional platforms like BamSEC or Seeking Alpha offer streamlined workflows, email alerts, deep-dive filtering, and real-time highlights for serious investors.

If you can share which specific stocks you are monitoring or whether you prefer a completely free tool vs. a paid platform with real-time alerts, I can narrow down the best recommendation for you.

Here are the top services and platforms used to track insider trading activity (Form 3, 4, and 5 filings), ranging from free scanners to professional-grade tools:

• OpenInsider is a popular, straightforward, and free web scanner designed specifically for filtering and searching through insider stock purchases and sales. You can access it directly via OpenInsider.
• Unusual Whales offers modern insider transaction tracking equipped with alerts, per-person tracking, and comprehensive market context dashboards. Check it out on Unusual Whales.
• BamSEC is a robust platform built for deeper research into SEC filings, featuring high-speed EDGAR workflows, insider/institutional ownership tracking, and alerts. Explore it on BamSEC.
• SECForm4.com provides real-time monitoring of corporate insider moves, buy/sell ratio charts, and institutional holding updates as filings occur. Visit SECForm4.com for more details.
• SEC EDGAR Database is the ultimate official source straight from the regulatory body where all raw Form 4 filings are originally published. You can browse or download the raw data via the SEC Insider Transactions Data Sets.

If you want to narrow this down, let me know:

• Are you looking for a free tool or a paid professional platform?
• Do you need real-time alerts or just a historical screener?

If you mean a service that tracks corporate insider buying/selling (SEC Form 4), there are several good options:

• openinsider.com — Best free option. Excellent for screening recent CEO/director/10% owner purchases and sales, filtering by transaction size, title, filing delay, and spotting cluster buys.
• quiverquant.com — Better if you want a dashboard, alerts, historical analysis, and API access. It focuses on open-market insider purchases/sales and parses SEC filings.
• whalewisdom.com — Strong choice if you want insider transactions plus hedge-fund 13F holdings, 13D/G filings, alerts, and historical data.
• sec.gov — The official source. Best for verifying an individual transaction directly from the company's Form 4 filing.

What I'd use

For most individual investors, I'd start with OpenInsider + Quiver:

OpenInsider → find unusual/large insider purchases → Quiver → investigate the insider, transaction history, and broader signal → SEC EDGAR → verify the actual filing.

One important distinction: insider buying is generally much more informative than insider selling. Executives sell for many reasons—taxes, diversification, compensation plans, scheduled sales—whereas voluntarily putting substantial personal cash into their own company's stock can be a stronger signal.

If you tell me whether you're looking for (1) a free service, (2) real-time alerts, (3) an API, or (4) a tool that automatically identifies the most bullish insider trades, I can narrow it down to the best one.