GUIDES
13F filings
explained
Institutional managers disclose their US-listed equity holdings four times a year. These guides cover what that disclosure contains, when it arrives, how to read it — and, just as importantly, what it leaves out.
START HERE
What Is a 13F Filing?
Who files, what the form discloses, and what it leaves out.
CALENDAR
13F Filing Deadlines: 2026 Calendar
Every quarterly due date, and how the 45-day rule handles weekends and holidays.
COMPLIANCE
13F Filing Requirements
Who has to file, how the $100 million test works, and 13F-HR versus 13F-NT.
HOW-TO
How to Read a 13F Filing
The information table column by column, and what each field actually tells you.
HOW-TO
How to Find a Fund's 13F on EDGAR
How to search EDGAR by name or CIK and pick the right form type.
DEFINITION
What Is a Section 13(f) Security?
The official SEC list that decides what can appear in a filing.
COMPARISON
13F vs 13D vs 13G
Three forms, three questions, and which one surfaces a position fastest.
DEEP DIVE
Why Are 13F Filings 45 Days Late?
Where the 45-day lag comes from, and how stale the data really is.
SEE IT IN PRACTICE
Reading a real portfolio
Once the mechanics make sense, the interesting part is applying them. Our Google Ventures breakdown walks through a live 13F portfolio sector by sector, and our analysis of the July 2026 Situational Awareness unwind shows what the form structurally cannot warn you about.
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