Learn · Last updated September 8, 2026
13F vs 13D vs 13G: Which Filing Tells You What
The one-line version: a 13F is a quarterly snapshot of a manager's entire U.S. long book; a 13D is an activist's disclosure that it owns more than 5% of one company and may seek to influence it; a 13G is the same 5% disclosure from a passive holder. The 13F tells you what a manager owns; the 13D and 13G tell you when someone owns a lot of one thing — and the 13D tells you they might do something about it.
The three forms side by side
| | Form 13F | Schedule 13D | Schedule 13G | |---|---|---|---| | Who files | Institutional managers with ≥$100M in 13F securities | Anyone crossing 5% of a company's voting shares with control intent | 5%+ holders without control intent (passive funds, index shops, QIIs) | | Scope | The whole reported long book | One company | One company | | Trigger | Calendar quarter | Crossing the 5% threshold | Crossing the 5% threshold | | Initial deadline | 45 days after quarter-end | 5 business days | 45 days after the quarter of crossing (passive investors: 5 business days) | | Updates | Next quarter | Within 2 business days of a material change | Within 45 days after a quarter with a material change | | What it signals | Portfolio composition and changes | Possible activism: board seats, strategy pressure, M&A interest | A large but passive position |
What each is good for
13F: the portfolio view
The 13F is the only form that shows a manager's positions together — which is why it's the one 13F trackers (ours included) are built on. Its weaknesses are the flip side: 45 days of lag and significant blind spots. No position-level 5% thresholds apply: a 0.1% position appears just like a 10% one.
13D: the loudest signal in the building
A 13D is rare, fast, and intentional. Filing one publicly commits the holder to having bought a big stake with possible plans — Item 4 of the form ("Purpose of Transaction") is where activists describe, in carefully lawyered prose, what they might push for. Stock prices routinely react to 13Ds the day they land. If 13Fs are the film of a portfolio, a 13D is a flare.
13G: big but quiet
The 13G says "we own a lot, we're not doing anything about it." Index funds generate most of them, which is why a 13G from Vanguard means nothing strategically while a switch — a holder converting a 13G to a 13D, which the rules require if intent changes — is a genuine event: a passive stake turning active.
How they work together
The productive reading order for a single company: 13D/13G filings tell you who holds concentrated stakes and with what intent; the holders' 13Fs tell you what else those managers own, which is the context that makes the stake interpretable. A 5% bet from a 20-position conviction manager and a 5% mechanical index holding are different facts wearing the same disclosure.
For following a manager rather than a company, the 13F remains the primary document — 13D/13Gs only fire on 5%+ stakes, which most positions, even large ones at big funds, never reach.
FAQ
Which is fastest? 13D, by design: 5 business days from crossing the threshold, and 2 business days for material updates. It's the closest thing to a real-time disclosure in this family.
Does a 13F position ever imply a 13D or 13G exists? If a 13F shows a position and the manager holds more than 5% of that company's shares, a 13D or 13G should exist too. Cross-checking the two is how you distinguish "big for the fund" from "big for the company."
Do individual investors file any of these? 13D and 13G apply to any 5% holder, individuals included. The 13F applies only to institutional managers over the $100M threshold.
Form definitions and deadlines come from the SEC's Form 13F FAQ and the SEC's Schedule 13D/13G guidance, as amended October 2023. Nothing here is investment advice.
