The 13F Securities List: What Counts, What Never Shows

The official list is the gatekeeper, not a definition

Section 13(f) of the Securities Exchange Act of 1934 requires institutional investment managers exercising investment discretion over $100 million or more in covered US equities to disclose their long positions quarterly, within 45 days of quarter end. For 2026 those deadlines are February 17, May 15, August 14, and November 16. Our 13F filing deadlines guide walks through the calendar mechanics and amendment windows.

Here is the part most summaries skip: "covered US equities" is not a judgment call the filer makes. The SEC publishes the Official List of Section 13(f) Securities each quarter, and a position is reportable if and only if it is on the then-current list. The list is keyed by CUSIP, the 9-character identifier that names a specific security rather than a company. That distinction matters: a company can have one share class on the list and another instrument (a foreign line, an unlisted bond) off it.

This design has two practical consequences. First, reportability is mechanical. Filers do not get to decide that a position is too small or too embarrassing to disclose; if the CUSIP is on the list and they hold it with discretion, it goes in the information table. Second, the list changes every quarter as securities list, delist, merge, and convert, so a name can drop out of 13F coverage without anyone selling a share. The SEC's own Form 13F FAQ is the canonical reference for these edge cases, and it is more readable than most agency documents.

What shows up: the reportable universe

The list is long, but it clusters into a handful of instrument families. The common thread is a US exchange listing: the list keys on the listed wrapper, not on what sits underneath it.

Two of these rows surprise people. ETFs count, which means a manager parking cash in a broad index fund will show that position right alongside single-name bets; an index ETF in a fund's top-ten list usually signals hedging or cash management, not conviction. And ADRs count even though the underlying business is foreign: a US investor's exposure to a Taiwanese chipmaker or a European pharma typically enters the 13F dataset through the US-listed depositary line. The foreign ordinary shares trading in Taipei or Frankfurt are not on the list, so a manager who holds the local line instead of the ADR is invisible here.

The wrapper rule also explains newer arrivals. When an asset class gets a US-listed fund wrapper, those fund shares generally join the list like any other ETF, even if the underlying asset (a commodity, a crypto asset) could never be 13F reportable directly.

What never appears, no matter how large

The omissions are where naive 13F analysis goes wrong, so it is worth being explicit about what is structurally invisible:

• Short positions. Form 13F reports long positions only. A fund that is net short a stock can still appear as a holder if it owns call options or a residual long line. There is no public, position-level short disclosure regime in the US comparable to 13F.
• Open-end mutual fund shares. The funds themselves file holdings disclosures, but a manager's stake in a mutual fund is not a 13(f) security.
• Bonds. Treasuries, agencies, munis, and ordinary corporate debt are off the list. Only certain convertibles make it on. A credit fund with billions at work can file a near-empty 13F.
• Foreign-listed equities. No US listing, no CUSIP on the list, no disclosure. Global funds systematically under-report their true book through this channel.
• Derivatives other than listed options. Futures, total return swaps, forwards, and OTC options are absent. Academic and regulatory commentary has generally flagged swaps as the biggest blind spot, since they can synthetically replicate huge equity exposure off-filing. A well-known family-office blowup made this gap famous: the positions were enormous and almost none of them appeared in any 13F.
• Private holdings, real estate, currencies, directly held commodities, and cash. None are listed equity, so none are reportable.

If you want the actual buy and sell prints rather than quarterly long snapshots, that is a different filing family entirely: insiders report trades on Form 4 within 2 business days, and activists crossing 5% file Schedule 13D within 5 business days. Our 13F vs 13D vs 13G vs Form 4 comparison maps which form answers which question.

Reading traps inside the reportable set

Even within the covered universe, three quirks routinely produce wrong conclusions.

Options render in share-equivalent terms. A put position is reported as the number of underlying shares and their market value, flagged PUT. Strip that flag, as many aggregators historically did, and a large bearish put bet renders as the manager's biggest "long." When a top position shows a large value but the share count looks like an option overlay, check the put/call designation before inferring conviction. Our piece on how accurate 13F data really is covers this failure mode in depth, and how to read a 13F filing shows where the flag lives in the raw XML.

Confidential treatment hides positions temporarily. The SEC can permit a filer to omit a position while it is being accumulated, with the data disclosed later by amendment. Berkshire Hathaway has famously used this while building large stakes, which is why the Buffett portfolio page can gain a fully formed multi-billion dollar position in a single amendment. Amendments also restate and supersede earlier filings, so a point-in-time view of "what was known when" differs from the final corrected record.

The list itself moves. Delistings, mergers, and symbol changes pull CUSIPs off the list between quarters. A position vanishing from a filing does not always mean a sale; sometimes the security simply stopped being reportable. Diffing two quarters responsibly means diffing against the list, not just against the previous filing.

Pulling the reportable universe programmatically

Arkolith ingests the full EDGAR 13F stream and resolves it to clean identifiers. The Q1 2026 dataset covers 1,824 institutional filers, 1.87 million long positions, and $53.7 trillion in reported value, with every datapoint carrying provenance back to its SEC accession number, so an agent can cite the exact filing a number came from instead of hallucinating one.

# List covered institutional filers
curl -H "Authorization: Bearer YOUR_KEY" "https://arkolith.com/api/v1/funds"

# Resolve a name or ticker across the dataset
curl -H "Authorization: Bearer YOUR_KEY" "https://arkolith.com/api/v1/search?q=NVDA"

# Full holdings for one filer by CIK, options flagged separately
curl -H "Authorization: Bearer YOUR_KEY" "https://arkolith.com/api/v1/funds/0001067983/holdings"

The holdings endpoint separates the long equity book from option positions rather than summing them, for exactly the put/call reason above. Human-readable views of the same data live on pages like NVDA's institutional ownership, while the 13F data layer, quickstart, and connect flow turn the same reportable-universe logic into a first API or MCP call.

Frequently asked questions about the 13F securities list

Where do I find the official 13F securities list?

The SEC publishes it quarterly on its 13F lists page, as a CUSIP-keyed document. Each edition applies to the quarter it covers, so historical analysis needs the list that was current at the time. Filers are required to check their positions against the current edition.

Are short positions ever in a 13F filing?

No. Form 13F discloses long positions in 13(f) securities only, and there is no equivalent US regime publishing position-level shorts. The closest visible signal is a reported put option position, which appears in share-equivalent terms with a PUT flag. A fund's true net exposure to a name cannot be reconstructed from its 13F alone.

Are bonds and Treasuries 13F reportable?

Generally no. Treasuries, agencies, munis, and ordinary corporate bonds are not 13(f) securities, so they never appear regardless of size. The exception is certain convertible bonds, which sit on the official list because they convert into covered equity.

Do ETFs and ADRs count toward the $100M threshold?

Yes. The $100 million reporting threshold is measured against all Section 13(f) securities under a manager's discretion, and both US-listed ETFs and ADRs are on the list. A manager holding only index ETFs can still cross the threshold and owe a filing.

This article explains public filings and data concepts. It is not investment advice.