How to Track Smart Money: 13F, Insider and Congress Filings
Where hedge fund holdings, insider trades and congressional trades are disclosed, how late each one is, and a simple routine for reading them without fooling yourself.
ResourcesGuide
Is Copying Hedge Fund 13Fs a Good Strategy?
What research says about cloning famous investors’ 13F filings, how much the 45-day lag costs, and where copycat strategies go wrong.
Key takeaways
- Sometimes, with big caveats. One study found copying Berkshire’s disclosed buys beat the S&P 500 by 10.75% a year (1976–2006), but most managers are not Buffett and the edge depends on whom you copy.
- The 45-day filing deadline means you see a quarter-end snapshot up to about four and a half months after a trade, and the manager may already have sold.
- 13Fs leave out short positions, so a copied long can be half of a hedge you cannot see.
- Research on copycat mutual funds found clones matched high-fee funds after expenses, mainly because they skipped the fees.
- Copied ideas still have to fit your own portfolio’s risk, concentration and goals.
Which stocks do Wall Street’s best‑ranked analysts agree on? See them in Exent Gems →
What is 13F cloning?
13F cloning means buying the stocks a well-known manager discloses in their quarterly 13F filing, usually at similar weights, and updating when the next filing appears. The appeal is simple: you borrow someone else’s research for free. The problems are also simple: you see it late, you see only part of it, and you do not know why the manager owns it.
How late is a 13F?
A 13F can describe positions that are up to about four and a half months old. Per the SEC’s Form 13F FAQ, filings are due 45 days after each calendar quarter ends, and they show holdings on the last day of the quarter.
| Event | Date (illustrative) | Days since the trade |
|---|---|---|
| Manager buys | Jul 3 | 0 |
| Quarter ends: the snapshot date | Sep 30 | 89 |
| 13F filed on the deadline | Nov 14 | 134 |
| You buy after reading it | Nov 17 | 137 |
Illustrative timeline. A buy late in the quarter reaches you faster, and some managers file early, but you never see trades in real time. Insider trades on Form 4 arrive far faster, within two business days.
What does the research say about copying 13Fs?
The academic evidence is more favorable than you might expect for a few managers, and weaker once costs and selection are considered.
| Study | Sample | Finding |
|---|---|---|
| Martin & Puthenpurackal (2008) | Berkshire Hathaway, 1976–2006 | Buying each disclosed holding the month after disclosure beat the S&P 500 by 10.75% a year |
| Frank, Poterba, Shackelford & Shoven (2004) | High-expense mutual funds, 1990s | Copycat funds trailed before expenses but matched, and possibly beat, the originals after expenses |
| Cohen, Polk & Silli (Best Ideas) | US equity mutual funds | Managers’ highest-conviction stocks outperformed; most of their other holdings did not |
| Agarwal, Jiang, Tang & Yang (2013) | Hedge fund 13Fs, incl. confidential filings | Positions hidden through confidential treatment outperformed for up to 12 months |
Sources: Martin and Puthenpurackal abstract, Copycat Funds (NBER), Best Ideas (LSE) and Uncovering Hedge Fund Skill (Journal of Finance).
Read together, they say three things. A truly skilled, slow-moving manager can be worth copying even late. Much of a clone’s advantage over a fund comes from not paying its fees. And the most informative positions are the ones you are least likely to see: concentrated best ideas and holdings kept confidential.
Why do copycat portfolios disappoint?
- Selection bias: you pick managers because their past returns were great, which is the period you can no longer earn.
- Turnover: for fast-trading funds, a quarter-end list is stale before it is published.
- Missing shorts and options: a long stock may be hedged, so copying only the long side takes on risk the manager did not.
- Different constraints: a fund may hold a stock for liquidity, index tracking or client reasons that do not apply to you.
- Crowding: when many investors copy the same filings, the most popular names can get expensive.
- Concentration: copying one manager’s top five positions can leave you with far more single-stock risk than you intended.
If you use 13Fs, what makes it more sensible?
Investors who use 13Fs as an input, not a blueprint, tend to follow a few rules:
- Prefer slow, concentrated managers. Low turnover means the quarter-end snapshot stays relevant longer.
- Focus on new positions and large adds. These are closer to a manager’s best ideas than a long tail of small holdings.
- Look for agreement. A stock that several unrelated managers added, with insider buying on top, is a stronger lead than one fund’s position.
- Do your own homework. Write the thesis without the manager’s name. If it does not stand up, skip it.
- Size for your portfolio. Check how the idea correlates with what you already own before adding it.
A broader routine is in how to track smart money, and other places to find ideas are on stock ideas.
So, is it a good strategy?
As a complete strategy, copying 13Fs has more ways to go wrong than right for most investors: late data, hidden hedges and the risk of copying last decade’s winner. As a source of ideas to research, it is useful and free. Before relying on any manager, check how their disclosed picks actually performed: how to measure a fund’s 13F returns.
How to research 13F ideas with Exent
- Stocks Radar shows 13F, insider and congress views on each stock, next to analyst ratings ranked by past accuracy.
- Gems flag stocks where several of the best-rated analysts agree: a second, independent check on an idea.
- Upload your holdings and add the idea in the what-if simulator to see how concentration and correlation clusters would change.
Frequently asked questions
A 2008 study found that buying Berkshire’s disclosed holdings the month after disclosure beat the S&P 500 by 10.75% a year from 1976 to 2006. That is a past result for one exceptional, slow-moving investor, not a forecast.
They are due 45 days after each quarter ends and show holdings on the quarter-end date. A trade made early in a quarter can become public more than four months later.
No. They show long positions in US-listed securities. Short positions, most non-US holdings, cash and some confidential positions are not included.
Some funds build portfolios from 13F data. They face the same lag and missing-shorts problems, plus their own fees, so check their record against a simple index fund.
Those with concentrated, long-only portfolios and low turnover. For quantitative or multi-strategy firms, a quarter-end list says little.
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Educational content, not investment advice. Examples are illustrative; past performance does not guarantee future results.