Understanding Institutional & Insider Data
A study by Martin and Puthenpurackal (2008) asked a simple question: what if you just copied Warren Buffett? Not in real time — that's impossible — but using his publicly disclosed 13F filings, which arrive with a 45-day delay. Their finding: Berkshire Hathaway generated 11.14% annual abnormal returns above the S&P 500 over their 1976–2006 study window, and a hypothetical portfolio that mimicked Berkshire's disclosed investments after the filings became public still earned 10.75% annual abnormal returns.[1]
The gap between 11.14% and 10.75% is remarkably small. Nearly all of Buffett's edge was preserved even when replicated by strangers reading a filing a month and a half late. The data was free. The strategy was mechanical. The edge came from paying attention to what the best investor in the world was telling the market, in plain sight, every quarter.
Every quarter, several thousand institutional managers disclose their U.S. equity holdings to the SEC. Every day, corporate insiders report their stock purchases and sales. Tradetheon processes these regulatory filings into a research platform built around three principles:
Signal over noise. Rather than dumping every filing onto a screen, we filter for the patterns that academic research and investment practice show are most informative — institutional accumulation, insider cluster buys, significant executive purchases. Less data, more insight.
Design that sustains focus. From chart layouts to table structure, the platform is built to reduce cognitive strain and surface what matters. Dark theme for extended reading sessions, color-coded activity badges, sortable columns, and focused data views that don't overwhelm.
Research-backed, not black-boxed. Our signals are grounded in published academic research and sound mental models — not proprietary scoring no one can audit. Where peer-reviewed evidence exists, we cite it so you can evaluate it yourself. Where a signal rests on reasoning rather than empirical studies, we say so plainly.
The approach has academic backing beyond just Buffett. Bruce Greenwald, professor at Columbia Business School, identifies 13F filings and insider transactions as indirect information sources in the research strategy chapter of Value Investing: From Graham to Buffett and Beyond — a foundational text in the value investing curriculum.
What you can do with it
Source investment ideas
"Don't tell me what you think, show me your portfolio." — Nassim Nicholas Taleb
Skin in the game is the ultimate filter. When a fund manager stakes billions on a position, or when a CEO writes a personal check for company stock, they're telling you more than any analyst report or earnings call ever could.
The Screener narrows the universe of 4,000+ U.S. stocks to the ones where informed capital has skin in the game — while filtering out untimely positions where institutional money is flowing the other direction. Signals like "Institutional Accumulation," "Superinvestor New Position," "Top 50 Bet," and "Exit Position" surface stocks backed by multiple sophisticated investors, or flag stocks that informed capital is actively abandoning.
Study the best investors
Learning from superinvestors works the same way learning works in any field. A young soccer player doesn't invent their own technique from scratch — they study Messi's movement, Ronaldo's positioning, and adapt what works to their own game.
Manager Dashboard pages let you study how each fund operates: portfolio concentration, holding periods, sector track record, and historical returns. But the key insight is that it's not just who you study — it's how. Many superinvestors are generalists with pockets of deep expertise. Buffett's track record in banking is near impeccable, while his bets on other industries, though impressive overall, are less consistent. Understanding where each manager's edge is sharpest helps you know which of their ideas deserve the most attention.
Research specific stocks
The Security page and insider record tabs let you gauge institutional and insider money flow for any covered stock. How many tracked managers own it? Are they adding or trimming? Have insiders been buying with their own money? These are indirect signals — not buy recommendations, but a way to understand what informed participants are doing while you conduct your own fundamental analysis.
How this guide is organized
13F Filings: The Basics
What institutional holdings data shows, what it hides, and how to read it on Tradetheon. Start here if you've ever wondered how people track what Warren Buffett is buying — and why a common mistake is to ignore investor sales when you shouldn't.
Insider Transactions: The Basics
When executives buy their own stock and why research shows it matters more than when they sell. How Tradetheon detects cluster buys, significant purchases, and the sale-side signals that warn of skin-in-the-game erosion — and how to circumvent the limitations of this data.
Sources
[1] Martin, G. & Puthenpurackal, J. (2008). "Imitation is the Sincerest Form of Flattery: Warren Buffett and Berkshire Hathaway." SSRN Working Paper. → Paper