AlphaYou13F Filings Explained: How to Track Hedge Fund Moves
What a 13F is, why the median filer uses all 45 days of the deadline, and the four things a 13F structurally cannot show you - shorts, cash, timing, and anything sold before quarter end.
Every quarter, a wave of headlines announces what the famous investors "are buying." They are not buying. They bought, at some point in a three-month window that closed six weeks ago, and this is the receipt.
Direct answerA 13F is the quarterly holdings report large institutional managers must file within 45 days of quarter end. It shows long US equity positions on the last day of the quarter and nothing else. Across the 5,109 filings AlphaYou tracks, the median arrived exactly 45 days after quarter end, so the typical 13F describes a portfolio that is already a month and a half old.
- Institutional managers with more than $100m in qualifying US equities must file Form 13F within 45 days of quarter end, listing their long positions as of the final day of that quarter. AlphaYou tracks 132 filers across 5,109 filings and roughly 2.55 million individual positions, with the latest period being 30 June 2026.
- The deadline is 45 days. The median filing in our set arrived on day 45 exactly. Filers do not file early; they use the entire window, and 809 of 5,109 filings arrived even later than that.
- A 13F is a partial photograph of the long US equity slice of a portfolio, on one day. Treating it as the whole portfolio is the most common way people misread it.
What a 13F Actually Contains
Institutional managers with more than $100m in qualifying US equities must file Form 13F within 45 days of quarter end, listing their long positions as of the final day of that quarter. AlphaYou tracks 132 filers across 5,109 filings and roughly 2.55 million individual positions, with the latest period being 30 June 2026.
Scale varies enormously. BlackRock's most recent filing alone carries 5,696 separate positions worth about $6.7 trillion. Most filers report a few hundred.
The Lag Is Not a Detail, It Is the Product
The deadline is 45 days. The median filing in our set arrived on day 45 exactly. Filers do not file early; they use the entire window, and 809 of 5,109 filings arrived even later than that.
That has a concrete consequence. A position "revealed" in a mid-August filing could have been opened in April and sold in July, and the filing would look identical either way. You are reading a snapshot of one specific day, published six weeks later, by someone with no obligation to still hold any of it.
This is why 13F-based copy-trading is structurally awkward rather than merely slow. The information is not late by accident; it is late by design.
Four Things a 13F Cannot Show You
A 13F is a partial photograph of the long US equity slice of a portfolio, on one day. Treating it as the whole portfolio is the most common way people misread it.
| Not disclosed | Why it matters |
|---|---|
| Short positions | A "bullish" long book can be a hedge against a larger short you cannot see |
| Cash | You cannot tell conviction from a manager sitting 40% in cash |
| Anything bought and sold inside the quarter | A full round trip leaves no trace at all |
| Non-US and non-equity holdings | Bonds, commodities, foreign listings and most derivatives are out of scope |
What It Is Genuinely Good For
Direction and conviction over time, rather than entry timing. A manager who has increased the same position across six consecutive quarters is telling you something durable that no single filing does. A brand-new position at meaningful size is worth noticing. So is a complete exit.
Reading several quarters in sequence is where 13Fs earn their keep. Reading one quarter as a buy list is where people lose money.
Amendments Quietly Change the Record
Filers can and do amend. A position that appeared in the original filing can be restated later, which means a number you read on day 45 is not necessarily the final number. Any tracker that ingests originals and ignores amendments will drift from reality over time.
How to Track Them
AlphaYou tracks 13F filers alongside congress disclosures and insider Form 4s, so a fund adding to a position can be read next to whether the company's own executives were buying in the same window. One quarterly filing is context. Three sources agreeing is a reason to look closer.
FAQ
How current is a 13F?
Not very. The median filing in our set landed exactly 45 days after quarter end, so the holdings are around six weeks old on arrival, and the earliest of them are over four months old.
Does a 13F show what a hedge fund is shorting?
No. Only long US equity positions are reported, so a long book can be one leg of a trade you cannot see.
Can I copy a fund's portfolio from its 13F?
You can replicate the disclosed longs, but you would be buying at different prices, weeks later, without the shorts, cash or non-US holdings that shape the real portfolio.
Why do filers wait the full 45 days?
Filing early surrenders information for nothing. The median filer uses every day available.
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