Methodology

This page documents exactly what our data is, where it comes from, and what we do to it. If anything here and a regulator's own documentation ever disagree, the regulator is right and we have a bug; tell us.

Sources

Every figure comes from an official regulator's or self-regulatory organisation's public disclosure:FINRA and SEC EDGAR for the United States, the FCA for the UK (next section), ASIC for Australia, and the AMF, the Netherlands' AFM, Norway's Finanstilsynet and Sweden's Finansinspektionen for France, the Netherlands, Norway and Sweden. Nothing else feeds the site.

United States

US data joins two official sources. Short interest comes from FINRA's consolidated equity short interest report: FINRA member firms must report their short positions in all US equities twice a month, for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated shares-short figure per security about nine business days after each settlement date. Shares outstanding come from SEC EDGAR: the cover-page share count of each company's latest 10-Q/10-K, always dated on or before the settlement date and never more than nine months old. The percentage we publish is FINRA's shares short divided by that share count, and both source figures are stored alongside every data point.

We only publish a percentage we can stand behind, so the US section excludes: over-the-counter securities and ETPs (NYSE, Nasdaq and NYSE American corporate listings only), securities with no matching SEC filer, no fresh share count or only a single one on record (recent IPOs), foreign-located filers (whose US listings are typically ADSs, counted in different units than their cover-page shares), companies listed under several share classes (one class's shorts cannot honestly be divided by the whole entity's shares), stocks in a stock split whose post-split share count has not yet appeared in an SEC filing, and any computed value above 100%, which almost always indicates a faulty denominator rather than a real position. Once a settlement date is published, its denominator is frozen: a revision marker on a US figure always means FINRA itself re-published the number.

US short interest data: FINRA (finra.org). FINRA® is a registered trademark of the Financial Industry Regulatory Authority, Inc. This site is not affiliated with or endorsed by FINRA or the SEC. FINRA data is displayed for personal reference; bulk redistribution is not permitted (see terms).

United Kingdom

The UK source is the FCA's public short-selling disclosures under the Short Selling Regulations 2025:

The daily ANSP publication, listing for each in-scope company: issuer name, ISIN of the main class of ordinary shares, the aggregate net short position as a percentage of issued share capital (the sum of individual notified positions of 0.2% or more), and the latest position date included.
The Reportable Shares List (RSL), the FCA's definition of which companies are in scope, updated monthly.

We hold no market-data licences by design: no share prices, market caps or volumes appear anywhere on this site, only regulatory position data.

Timing

The FCA publishes each working day at approximately 12:00 UK time, two working days after the position date (T+2). Our pipeline ingests at 12:30 UK with retries at 14:00 and 17:00. If a publication is missing all day, the site keeps the previous day's data and the homepage timestamp keeps showing the last real update, currently 26 Aug 2026.

Validation

Every downloaded file must pass validation before anything is published: the file parses; the row count is plausible against recent days; every ANSP value is within 0–100%; ISINs are well-formed; dates parse and are not in the future; no duplicate company/date rows. If any check fails we publish nothing and keep yesterday's data: accuracy over availability, always. Companies appearing in the publication but not on the RSL are kept and flagged, never silently dropped.

Corrections and revised figures

The FCA may exclude a notified position while verifying it and may amend or re-publish previously published aggregates. Corrections are a normal part of this dataset, and we treat them explicitly:

Every run re-reads a trailing window (10 working days) of publications.
When an already-archived figure changes, we adopt the new value and mark it ʳ wherever it appears; the underlying data file records the old value, the new value, and the date we detected the change.
Our full data history is version-controlled, so every revision is auditable.

Derived numbers

Rankings, 1d/5d/20d changes, sparklines, the new & leaving lists, the sector and weekly digest pages, the all-time records and the embeddable charts are computed from the archived publications, nothing else. Changes are percentage-point moves measured across published trading days (published reports for the US); companies with insufficient history show "–". Company URLs are stable slugs; a renamed issuer keeps its URL.

The legacy archive (pre-2026 register)

Before 13 July 2026 the UK published individually named short positions at the 0.5% threshold. We archived that register's final state (every current and historical disclosure back to 2012) before it was switched off. It powers the transition story and is kept frozen; it is not part of the daily dataset.

Australia

Australian data comes from ASIC's daily aggregated short position reports: for each ASX-quoted product, the short positions reported to ASIC by all short sellers (reporting obligations begin at A$100,000 or 0.01% of capital) as a percentage of total product in issue. ASIC publishes each trade date's file on the fourth business day after it (T+4); we ingest it the day it appears and never recompute ASIC's percentages. ASIC notes it cannot verify every individual report. The file covers all quoted products, occasionally including ETPs and quoted debt where reported positions can exceed 100% of a stub's units on issue.

Europe (France, Netherlands, Norway, Sweden)

European data comes from each national regulator's public register of named net short positions under the EU Short Selling Regulation: individual positions of 0.5% or more of share capital, with the position holder identified. We aggregate those disclosures per company per trading day (the aggregate is a floor: positions between 0.1% and 0.5% are reported privately and are not public) and list the current named holders on each company page.

France: AMF data via data.gouv.fr, full history since 2012, reused under the Licence Ouverte v2.0.
Netherlands: the AFM's register of net short positions (source: AFM, www.afm.nl); written permission to reuse the public data with source attribution is on file. The register's current export carries each open position's full history; its archive holds closed positions back to 2012.
Norway: Finanstilsynet's Short Sale Register API (ssr.finanstilsynet.no), full history with named holders; written permission to reuse the public data is on file.
Sweden: Finansinspektionen's short selling register (source: FI). FI rate-limits its historical file, so the Swedish series may start from the day we first ingested it and grow daily.

What we are not

Independent site. Not affiliated with FINRA, the SEC, the FCA, ASIC, AMF, AFM, Finanstilsynet, Finansinspektionen or any other regulator. Nothing here is investment advice: we publish and explain regulatory data; we do not interpret it into recommendations, predictions or "signals". Internal operational notes: UK clock changes shift the FCA's publication time relative to UTC; our schedule is reviewed at each change.