How to Copy a Hedge Fund Portfolio With 13F Filings

You can copy a hedge fund's portfolio by replicating the top holdings from its quarterly SEC 13F filing - a strategy known as clone or coattail investing. The binding constraint is the 45-day disclosure lag: by the time you see a position, the fund has held it for at least a quarter and may have sold it. Cloning works best on concentrated, low-turnover funds whose positions survive that lag.

How 13F Cloning Works

Institutional managers with $100M+ in US equities must disclose their long positions every quarter, within 45 days of quarter end. Cloning turns those disclosures into a personal portfolio in four steps:

• Pick the fund - a manager whose judgment you want exposure to and whose style is cloneable (more on that below).
• Take the top N - usually the 5-20 largest holdings by portfolio weight from the latest filing.
• Choose a weighting - equal weight across the N names, or weights that mirror the fund's own allocation.
• Rebalance each filing season - when new filings land (mid-February, May, August, November), drop exited positions, add new ones, and adjust weights.

The whole strategy runs on four data points a year. That is both its appeal - almost no maintenance - and the source of its main weakness.

The 45-Day Lag Decides Which Funds You Can Clone

The lag is the whole game. A filing covering March 31 arrives in mid-May - and a position opened in early January is over four months old by the time you can see it. Three consequences follow:

• High-turnover funds are uncloneable - a quant book that turns over weekly has no overlap with its own last filing. Copying it is copying noise.
• You never get the manager's entry price - you buy after the disclosure, sometimes after the market has already reacted to it.
• You see the long book only - 13Fs exclude shorts, most derivatives, non-US holdings, and cash. A position that looks like a bold long may be one leg of a hedged trade.

The flip side: for a manager who holds positions for years, 45 days is a rounding error. That asymmetry is why cloning has a real track record with Buffett-style concentrated value investors and none with fast-trading funds.

Equal Weight vs Conviction Weight

Equal weight splits your capital evenly across the top N holdings. It is simple, avoids concentrating in one name, and ignores the manager's actual opinion - their 20% flagship bet and their 2% starter position get the same allocation from you.

Conviction weight sizes positions to follow the manager's meaning. The plain version mirrors the fund's own portfolio weights. A sharper version ranks positions by a conviction score that also accounts for whether the position is new or was just increased - action, not just size. High-conviction moves are the filings-level view of the same idea.

Which Funds Are Worth Cloning

Three filters do most of the work:

• Low turnover - positions held across many quarters, so the filing you act on still describes the portfolio.
• Concentration - a fund whose top 10 holdings carry most of its assets has opinions worth copying; a 3,000-position book is an index in disguise.
• A verifiable track record - check fund track records (win rates and estimated position P&L computed from the filings themselves) before trusting anyone with your allocation.

HoldingsIntel tracks 551+ institutional funds with filing history through Q1 2026 - you can browse every tracked fund and inspect turnover, concentration, and quarter-by-quarter changes before shortlisting a clone candidate.

Backtest Before You Commit

Every choice above - which fund, how many positions, which weighting - is testable against history before a dollar moves. The Fund Cloner simulates cloning any tracked fund quarter by quarter: it walks the actual filings, applies your position count and weighting, and plots the result against a SPY benchmark. Scenarios let you test cloning only new positions or only double-downs instead of the whole book.

The test is unforgiving by design: if the clone did not beat a plain index fund historically, the index fund wins - it is simpler, cheaper, and needs no filing calendar. Cloning earns its complexity only when the specific fund's edge survives the lag.

Related Terms

New to the underlying filings? The 13F filings guide covers who files, what's disclosed, and what's not. Key terms:

• 13F Filing - The quarterly disclosure cloning is built on
• Conviction Score - The basis of conviction-weighted cloning
• Position Changes - The quarter-over-quarter deltas a clone rebalances on

Frequently Asked Questions