Insider, Institutional and Sentiment Data

A free, no-signup screener of SEC Form 4 insider trading filings, built around fast tabular views and cluster-buy detection. Traders can filter by transaction size, insider role, and industry to spot notable executive purchases and sales as they are filed. It is widely used as a raw data source rather than a polished dashboard.

Best for: Traders who want raw, fast insider-trade data without a paywall

• form 4 filings
• cluster buys
• insider screener
• no signup

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• Screeners & Scanners

The SEC's own full-text search across all electronic filings since 2001, including Form 4, 13F, 13D/G, 10-K and 8-K documents. Results can be filtered by form type, date range, and filer, making it the primary source every other insider and institutional-ownership tracker ultimately draws from. There is no cost and no account required.

Best for: Anyone who wants the original regulatory filing, not a third-party summary

• primary source filings
• form 4
• 13f filings
• full-text search

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An alternative-data hub tracking congressional trades, corporate insider activity, government contracts, lobbying, and other non-traditional signals like patent filings and app ratings. A free tier covers live congress and insider data, while a paid plan adds screeners, alerts, and backtested strategies. It is one of the broadest single sources for this kind of data.

Best for: Traders who want one dashboard covering congress, insiders and other alt-data signals

• congress trading
• insider trading
• government contracts
• alerts
• screener

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• Research
• Screeners & Scanners

A clean, free tool for browsing US congressional stock trading disclosures, filterable by politician, party, chamber, and issuer. Filings typically appear within a day or two of disclosure, and each trade links back to the underlying STOCK Act report. It focuses solely on congress trades rather than trying to cover insiders or funds too.

Best for: Anyone who wants a simple, focused feed of congressional stock trades

• congress trading
• politician filters
• stock act disclosures

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• Research

A 13F tracking site covering the broad universe of institutional filers going back to 2001, with holdings history, ownership changes, and fund comparison tools. The free tier gives a couple of years of history, while paid plans unlock deeper historical data and analytics. It is used to see what hedge funds and large managers are buying and selling each quarter.

Best for: Traders who want depth and history across the whole 13F filer universe

• 13f filings
• hedge fund holdings
• ownership history
• fund comparison

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• Research

A free site curating the portfolios of a few dozen well-known value investors, sourced from their 13F filings, including Warren Buffett and Bill Ackman. It shows top holdings, recent buys and sells, and stocks near 52-week lows across the tracked managers, along with some insider buying data. Coverage is intentionally narrow rather than the full filer universe.

Best for: Value investors who want to follow a curated list of well-known fund managers

• superinvestor portfolios
• 13f filings
• insider buys
• 52-week lows

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A hedge fund and insider tracker built on 13F filings, covering thousands of funds and insiders alongside congressional stock transactions. It offers portfolio-building and comparison tools, consensus stock picks across tracked funds, and ETF flow tracking. It leans toward breadth of coverage over deep analytics for any single filer.

Best for: Traders who want broad fund and insider coverage in one place

• hedge fund tracker
• insider trading
• congress trading
• 13f filings
• consensus picks

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An equity research platform built on regulatory filings that layers proprietary scores, such as a short-squeeze score and ownership score, on top of 13F, 13D/G, and Form 4 data. It also covers short interest, options flow, and analyst sentiment across thousands of equities. The free tier is limited, with most of the proprietary scoring behind a subscription.

Best for: Traders who want proprietary scoring layered on top of raw filing data

• short interest
• institutional ownership
• insider trades
• squeeze score
• options flow

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• Options Analytics
• Research

A short-interest analytics platform that estimates short interest and cost-to-borrow in near real time by pulling from securities lending data, instead of waiting on the biweekly exchange-reported figures. It also covers options flow, technical signals, and a proprietary stock score, with access through the web, API, and Excel add-in. Real-time data requires a paid plan.

Best for: Active traders who need short interest that isn't two weeks stale

• real-time short interest
• cost to borrow
• squeeze signals
• options flow
• api access

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• Options Analytics
• Market Data APIs

A long-running short interest data site covering over 16,000 stocks across major US exchanges, with free basic short interest figures and days-to-cover ratios. Paid features add a short squeeze ranking, a dedicated screener, and squeeze alerts. The site is explicit that its data is for research rather than investment advice.

Best for: Traders screening broadly for short squeeze candidates

• short interest
• days to cover
• squeeze ranking
• short screener

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• Screeners & Scanners

A simple, free database limited to stocks with short interest above 20 percent of float, sorted with ticker, exchange, float size, and industry. It has no screener beyond exchange filtering and no account features, focusing purely on surfacing the most heavily shorted names. It suits traders who just want a quick shortlist rather than a full analytics platform.

Best for: Quick scans of the most heavily shorted stocks

• high short interest list
• float data
• no signup

A free market-data site combining dark pool and off-exchange volume, short interest and short volume, failures-to-deliver, borrow fees, and Reddit mention and sentiment tracking across hundreds of subreddits. Per-ticker pages let traders see exchange versus dark pool activity alongside social buzz in one view. A premium tier adds deeper historical data and extra tools.

Best for: Traders who want dark pool, short volume and social sentiment together

• dark pool data
• short volume
• reddit sentiment
• failures to deliver
• borrow fees

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• Charting
• Market Data APIs

A free, no-frills reader for SEC Form 13F filings that reformats EDGAR's raw data into something easier to browse. It lets traders view a manager's holdings history over time, compare filings across quarters, and see every institution that reported owning a given stock in a given quarter. It has no proprietary scoring, just clean access to the underlying filings.

Best for: Traders who want a plain, free view of raw 13F data

• 13f filings
• manager holdings history
• quarter comparison

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• Research

A free insider-trading tracker that pulls Form 4 filings from EDGAR in real time and adds institutional holdings and 13D/13G tracking. It charts buy-to-sell ratios to gauge insider sentiment and provides searchable company and insider profiles. Advanced screeners and deeper history sit behind a paid tier.

Best for: Traders who want real-time Form 4 alerts with sentiment ratios

• form 4 filings
• insider sentiment ratio
• institutional holdings
• 13d/13g tracking

An insider-trading screener covering 16 global markets, aggregating filings directly from regulators and exchanges rather than a single feed. The free tier covers latest transactions and basic screeners, with premium adding real-time alerts, insider performance rankings, and cluster-activity signal detection. Its multi-market reach goes beyond most US-only trackers.

Best for: Traders who want insider data across markets beyond just the US

• insider screener
• multi-market coverage
• cluster activity signals
• csv export

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• Screeners & Scanners

MarketBeat's aggregation of recent SEC Form 4 filings, showing insider role, transaction size, date, and post-transaction share count for free. A paid All Access subscription adds advanced filtering by sentiment and analyst consensus, CSV export, and a dedicated insider newsletter. It sits alongside MarketBeat's broader suite of free market data tools.

Best for: Traders already using MarketBeat who want insider data in the same place

• form 4 filings
• insider screener
• csv export
• newsletter alerts

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• Screeners & Scanners
• Research

A social platform built around ticker-tagged posts from a large community of retail traders, with a sentiment index and trending-ticker feed layered on top of the discussion. It is free to use, with optional paid features for extra insights and ad removal. It works more as a sentiment and idea-sharing feed than a formal data product.

Best for: Traders who want a real-time pulse on retail chatter around a ticker

• social sentiment
• trending tickers
• watchlists
• community discussion

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• News

A free, no-signup tracker of stock and crypto mentions across roughly 30 preset subreddits and 4chan's biz board, refreshed hourly. It ranks tickers by mention count, upvotes, and short-term price momentum, giving a quick read on what retail traders are chattering about. There is also a simple API for pulling the same mention data.

Best for: A fast, free check of what's trending on WallStreetBets and similar boards

• reddit mentions
• trending tickers
• no signup
• api access

A social analytics platform focused on WallStreetBets sentiment, tracking roughly 10 million weekly mentions across stocks, crypto, and commodities. It shows bullish/bearish sentiment heatmaps, call/put ratios, max pain levels, and has expanded into sentiment analysis of earnings call transcripts. It is more visual and WSB-specific than broader mention trackers.

Best for: Traders who want a visual read on WallStreetBets-specific sentiment

• wsb sentiment
• sentiment heatmap
• max pain
• call/put ratio
• earnings sentiment

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• Options Analytics

An AI-driven alternative-data platform scoring stocks from signals such as Reddit buzz, web traffic, app downloads, hiring trends, and insider activity, in addition to a portfolio-scoring tool that reads a brokerage screenshot. It offers free ticker lookups and stock alerts, with paid tiers for the full AI agent and deeper history. Its AI stock-pick performance claims are self-reported.

Best for: Traders who want multiple alt-data signals blended into a single score

• alternative data score
• reddit sentiment
• web traffic signals
• insider activity
• ai stock alerts

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• Screeners & Scanners

A free, widely cited composite sentiment gauge combining seven inputs, including market momentum, price breadth, put/call ratios, and volatility, into a single 0-100 reading from extreme fear to extreme greed. It updates continuously and includes a historical chart back to the index's inception. It is a snapshot indicator rather than a research platform.

Best for: A quick, well-known read on overall market sentiment

• market sentiment index
• historical chart
• put/call ratio
• volatility gauge

A weekly poll running continuously since 1987 that measures the share of individual investors who are bullish, neutral, or bearish on the market over the next six months. Current results are free to view, while full historical data and voting require AAII membership. It is commonly used as a contrarian indicator when readings hit extremes.

Best for: Traders tracking long-running retail sentiment extremes

• retail sentiment survey
• bullish/bearish reading
• contrarian indicator
• weekly data

Barchart's free presentation of the CFTC's weekly Commitments of Traders reports, showing net futures positioning by producers, swap dealers, managed money, and other reportable categories. It covers currencies, energies, financials, grains, indices, metals, and softs, with a disaggregated view for deeper category breakdowns. Data is released weekly, following the CFTC's own Friday schedule.

Best for: Futures and forex traders tracking large speculator positioning

• commitments of traders
• futures positioning
• managed money data
• weekly cftc data

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• Market Data APIs

FINRA's own free short interest data, collected from broker-dealers under Rule 4560 and published twice monthly for all exchange-listed and OTC equities. It offers an interactive grid, five years of historical downloads, and an API, making it the primary regulatory source that most other short-interest sites repackage. It is not real time, unlike vendor estimates.

Best for: Traders who want the authoritative, regulator-reported short interest figures

• official short interest
• biweekly data
• historical download
• api access

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• Market Data APIs

Unusual Whales tracks real-time options order flow, sweeps and blocks across thousands of US tickers, alongside dark pool prints, gamma exposure and congressional trading data. A built-in AI assistant summarizes market activity and flags notable trades. Extensive filtering makes it a common starting point for retail traders following institutional options activity.

Best for: Traders wanting the broadest raw options-flow and dark pool dataset

• options flow
• dark pool prints
• gamma exposure
• congress trading
• alerts

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• Option Flow

InsiderFinance processes millions of daily options and dark pool prints to surface the flow most likely to move a stock, alongside gamma exposure, open interest and a market scanner with news sentiment. It also tracks congressional and insider trades. A limited free flow feed is available before the paid dashboard is needed.

Best for: Traders wanting flow, dark pool and GEX in one low-cost dashboard

• options flow
• dark pool prints
• gamma exposure
• congress trading
• scanner

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• Option Flow

Research platform that tracks and ranks the historical accuracy of Wall Street analysts, bloggers and insiders, then aggregates their calls into consensus price targets and a Smart Score for individual stocks. Also surfaces insider transactions and hedge fund activity. Free access covers the basics; Premium adds full rankings and alerts.

Best for: Investors who want analyst calls weighted by track record

• analyst accuracy tracking
• smart score
• insider transactions
• price targets

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Value-investing research platform that tracks the public portfolio filings of well-known fund managers and pairs that data with valuation tools like its GF Value estimate and financial strength ratings. Aimed at fundamental and value investors who study what prominent investors are buying. Free data is limited; Premium unlocks full guru holdings.

Best for: Value investors who follow prominent fund managers' holdings

• guru portfolio tracking
• gf value estimate
• financial strength ratings
• 13f filings

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• Research
• Screeners & Scanners

Fundamental research app combining institutional-style financial data, analyst estimates, earnings transcripts and 13F fund-holding tracking in a mobile-first interface. Built to give retail investors data access closer to what professional analysts use. A usable free plan is available, with paid tiers unlocking deeper history and transcripts.

Best for: Investors who want institutional-style data in a mobile app

• fund holdings tracking
• analyst estimates
• earnings transcripts
• financial statements

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• Research

SqueezeMetrics publishes the Dark Index (DIX), a dollar-weighted dark pool short-volume gauge for S&P 500 names, and GEX, one of the original public gamma exposure models. DIX is free and updated daily after the close, while the fuller monitor and historical data sit behind a monthly subscription. It is regarded as an academic benchmark for these metrics.

Best for: Traders wanting the original, research-grade DIX and GEX metrics

• dark pool index
• gamma exposure
• daily data
• historical charts

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• Option Flow

Nasdaq Data Link (formerly Quandl) is a marketplace of financial, economic and alternative datasets accessed through a single REST API, spanning futures, macro indicators, and various stock-related datasets contributed by third parties. Many datasets are free while others require a paid subscription, and options-specific coverage depends on the individual dataset chosen. Suits developers wanting macro and alternative data alongside price series.

Best for: Developers wanting macro and alternative datasets alongside prices

• alternative data
• free datasets
• macro data
• historical data

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• Market Data APIs

A calendar built specifically for biotech traders, tracking FDA decision dates, PDUFA dates, and advisory committee meetings that often move small-cap pharma stocks sharply. Basic catalyst dates are free to browse, while premium tools add deeper filtering and catalyst screening for active biotech traders.

Best for: Biotech traders tracking FDA decision catalysts

• pdufa dates
• fda calendar
• advisory committee dates
• biotech catalysts

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• Calendars & Macro
• Screeners & Scanners

An institutional-grade corporate events calendar covering earnings, dividends, splits, investor conferences, and over 40 other event types across roughly 11,000 companies worldwide, refreshed several times a day. It is aimed at traders and firms who need a single reliable feed of confirmed dates rather than a free public calendar.

Best for: Firms needing a comprehensive corporate events feed

• corporate events calendar
• 40+ event types
• global coverage
• api and json feed

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• Calendars & Macro
• Research