13F vs 13D vs 13G

The cleanest way to keep them straight is by the question each one exists to answer.

Note the asymmetry in orientation. A 13F is organized around the manager. A 13D or 13G is organized around the company. If you want to know what Bridgewater holds, you want a 13F. If you want to know who holds a big slice of a particular stock, you want 13D and 13G.

Both get called institutional disclosures, and the same large asset managers file both, which is why they blur together. They answer opposite questions. Form 13F is portfolio-wide and unconditional: every quarter, a qualifying manager lists its entire disclosed US-listed equity book, small positions alongside large ones. Schedule 13G is conditional and narrow: it exists only because a filer crossed 5% of one company, it says nothing about the rest of that filer’s holdings, and in practice it is filed by index funds, large asset managers and other holders with no intent to steer the business.

The timing differs as well. Form 13F is due 45 days after the end of each calendar quarter. Schedule 13G runs on the schedule the SEC revised in 2024: qualified institutional investors and exempt investors file within 45 days after the end of the calendar quarter in which their beneficial ownership exceeds 5%, and a qualified institution whose ownership passes 10% files within five business days after that month ends. Passive investors file within five business days of crossing 5%.

So choose by the question you are asking. To see a fund’s whole book — sector tilts, position sizing, what changed since last quarter — read the 13F. To see who owns more than 5% of a single company, read that company’s 13G filings: one stake, one named holder, and none of the hundreds of other lines a 13F would bury it among.

This is the slowest of the three forms against the fastest. A 13F waits for the calendar: 45 days after quarter end, every quarter, whether anything happened or not. A 13D is triggered by an event — crossing 5% of a company’s shares with intent to influence or control it — and is due within five business days, with material amendments due within two.

The practical consequence is that a position can be public in a 13D months before the same position appears in a 13F. A stake crossed in the first week of April shows up in a 13D within days; the 13F covering that quarter is not due until the middle of August.

They are not substitutes in content either. A 13D describes one investor’s intent toward one company, and Item 4, Purpose of Transaction is where that intent is stated; it tells you nothing about the rest of the filer’s book. The 13F makes the opposite trade-off: complete coverage of the disclosed portfolio, and no statement of intent about any of it.

These are the closest pair: same statute, same 5% trigger, same subject — one issuer. What separates them is intent. An investor who crosses 5% wanting to influence or control the company files the long form, 13D. An investor who crosses the same threshold without that intent files the short form, 13G.

Who files which follows from that. 13D is the filing of activists and of anyone else who wants board seats, a sale, or a change of strategy. 13G is for holders whose size comes from mandate rather than intent: a fund tracking an index it did not choose, or a manager whose stake grew with the money it runs. The deadlines diverge on the same logic: 13D is a flat five business days, while 13G depends on the filer category — five business days for passive investors, but as long as 45 days after the quarter end for qualified institutions, so a large passive stake can become public months after it was built.

Intent is not permanent, which is what makes the pair worth watching together. An investor whose purpose changes loses eligibility for the short form, and the 13D that replaces it is due on the same five-business-day clock that applies to crossing 5% in the first place. A filer moving from 13G to 13D is therefore not a paperwork change: it is the holder telling the market, on a fixed clock, that it now intends to act on a position it once called passive.

13F is the broadest of the three and the slowest. Any institutional manager with discretion over $100 million or more in Section 13(f) securities files every quarter, listing every disclosed position rather than just the large ones.

Its strength is breadth: you see the whole disclosed book at once, which makes sector tilts and multi-quarter conviction visible in a way single-stake filings never are. Its weakness is latency and incompleteness — covered in full here.

13D is triggered when an investor acquires beneficial ownership of more than 5% of a class of a company’s equity securities with intent to influence or control. That intent requirement is what separates it from 13G.

For anyone tracking positions, this makes 13D the earliest of the three signals by a wide margin. A stake crossed on the first day of a quarter surfaces in a 13D within a week; the same position might not appear in a 13F for another four months.

The most informative part of the filing is Item 4, Purpose of Transaction, where the investor states what they intend. Language about board representation, strategic alternatives, or a possible transaction is the substance; boilerplate about reviewing the investment is not.

13G is the abbreviated alternative for investors who cross 5% without control intent. In practice this is how index funds, large asset managers, and long-only institutions report the very large stakes they accumulate in the ordinary course of business.

Deadlines depend on which category the filer falls into — qualified institutional investors, exempt investors, or passive investors — and were also revised in the same round of amendments, with the new schedule effective September 30, 2024. Broadly, qualified institutions and exempt investors report within 45 days after the end of the calendar quarter in which they cross the threshold, while passive investors file within five business days.

It depends entirely on what you are trying to learn.

• —Studying a manager’s style or evolution? 13F. Nothing else gives you the whole disclosed book across many quarters.
• —Watching for activist involvement in a company? 13D, and read Item 4.
• —Mapping the institutional ownership base of a stock? 13G, which is where the large passive holders show up.
• —Trying to spot a position early? 13D and 13G both beat 13F substantially, but only for stakes above 5% of a single company.

One limit applies to all three equally: none of them disclose leverage, short positions, or anything held outside US-listed equities. That gap is the subject of a separate piece.