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.

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.