See what the world's best investors are buying.

Big Money Radar is a free, open model portfolio that tracks what 50 of the world's top institutional investors are buying through their public SEC 13F filings. It builds a conviction-scored stock portfolio by aggregating signals from hedge fund managers like Warren Buffett, Bill Ackman, Michael Burry, and Seth Klarman — updated every week.

A 13F is a quarterly report filed with the SEC (Securities and Exchange Commission) by institutional investment managers who oversee more than $100 million in assets. It lists every US equity holding — stock name, CUSIP, and number of shares. All 13F data is public, free, and sourced directly from SEC EDGAR. The main limitation: filings are due up to 45 days after quarter-end, so data can be 45–135 days old.

Every stock gets a single 0–100 smart-money confidence score — the one number shown across the whole site. It blends three signals: Breadth — how many of the 42 tracked investors hold it; Size — how large a percentage of each investor's portfolio it represents; and Momentum — whether investors are actively buying (adds points) or selling (deducts points) — then layers in Congress trades and insider Form 4 buys. Investors are weighted by track record: Buffett counts double a smaller manager. It is fully deterministic — no AI or black boxes. Read the full methodology →

The model runs a weekly update every Monday, checking the latest 13F filings published to SEC EDGAR. When new quarterly disclosures arrive (typically January, April, July, October), the portfolio may change significantly as new buying and selling activity is reflected. The "Updated" date at the top of the page shows when data was last refreshed.

In a backtest covering Q1 2022 – Q4 2025 (16 quarters, 1-quarter holding period), the model returned +48.5% vs the S&P 500's +52.2% — a cumulative alpha of -3.7%. It was ahead in 8 out of 16 quarters (50% of them).

Which rules this measures. The figures above run the rules this site actually follows: the book holds 10 stocks, buys only when a slot is free, and sells only when a holding collapses — so in practice it is bought once and rarely changes. A version that instead rebuilds the top ten every quarter returned +77.3% over the same window and was ahead in 12 of 16 quarters. That second, better-looking number is the one this page used to show, and it described a portfolio the site does not hold. It is kept here for comparison rather than removed.

Important caveats: this backtest contains look-ahead bias since 13F data was not available in real-time during the tested periods, and the tracked investors were themselves chosen with hindsight — they're famous because they've won historically. Past performance does not predict future results. Run your own backtest →

Steady Compounders tracks value-focused, long-term investors like Buffett (Berkshire), Klarman (Baupost), and Pabrai — favouring quality businesses held for years. Innovation Edge tracks growth and tech investors like Tiger Global, Coatue, and Dragoneer — focusing on disruptive tech and consumer platforms. Bold Strategists tracks macro, activist, and contrarian investors like Ackman (Pershing Square), Druckenmiller, and Burry — willing to take concentrated, unconventional bets. The "All Investors" view combines signals from all 50.

Separate from 13F filings, the model also tracks SEC Form 4 filings — mandatory disclosures when a company's own directors, officers, or major shareholders buy or sell stock. This "insider trading" (legal) data must be filed within 2 business days, making it much faster than quarterly 13F data. When both hedge funds and company insiders are buying the same stock, it's a particularly strong signal. See insider signals →

No. Big Money Radar is purely an informational and educational tool. It is not a licensed financial product or investment service. Adrian Bogen is not a registered financial advisor. Nothing on this site constitutes a recommendation to buy or sell any security. Always do your own research and consult a qualified financial advisor before making any investment decisions.