API QuantAPI Developer

This API returns data for multiple stocks — every constituent of a market index, or of one of your own universes — for the specified date.

Every publicly disclosed short position open on the date in the selected listings, one row per holder per listing.

Under the European short-selling regime, a holder whose net short position in a company reaches 0.5% of its issued share capital must disclose it publicly, and disclose again at every 0.1% step until it falls back below 0.5%. These are those public disclosures, one row per holder per position — disclosed figures, not a model, and not the ORTEX short-interest estimate.

Positions below the 0.5% threshold are never disclosed, so the sum of these positions is a floor on the short interest in a stock, not the total.

Since 13 July 2026 the UK regulator publishes a single aggregated net short position per issuer instead of per-holder positions; UK listings therefore show one "All Holders (Aggregate)" position.

Available Data Points:

• Date: The snapshot date the positions are open on (YYYY-MM-DD format).
• Exchange Symbol: Symbol of the exchange where the security trades.
• Ticker: The ticker symbol associated with the security.
• Company Name: The name of the company issuing the security.
• Ortex Company ID: Unique id for a company.
• Ortex Security ID: Unique id for a security issued by a company.
• Ortex Tradable Item ID: Unique id for a listing of a security.
• Holder: The name of the disclosing position holder.
• Position Start Date: The date the position was established at its disclosed size (YYYY-MM-DD).
• Position End Date: The date the position was superseded by a new disclosure or fell below the threshold; null while it is still open. For UK listings (the FCA aggregate) the end date is exclusive: the aggregate stops applying on that date.
• Published Date: The date the regulator published the disclosure — when it became public knowledge. Null for UK listings: the FCA aggregate carries no publication date.
• Short Interest %: The disclosed net short position as a percentage of issued share capital.

Index or universe, and date

Use index or universe to select the listings and date to select the day (defaults to today). A position is returned when it started on or before date, had not ended before it and had been published by it (a disclosure is never shown before it was public; the UK aggregate has no publication date and is not filtered on one). One row per holder per listing; a constituent with no open disclosure has no row, and constituents outside the European regime (US listings, for example) never have one. Rows carry the disclosure itself; the per-position share count, value and free-float percentage are served per listing by the stock endpoint, because they need a price and a share-count lookup for every position.

Try it out! You can test the API with the trial key TEST. Simply include it in your request headers; either here, or add the header "Ortex-Api-Key": "TEST" to your http request.

Trial key restrictions: Trial keys may be limited to a specific date range and set of regions. Requests outside the allowed regions or entirely outside the allowed date range are rejected; a date window that partially overlaps the allowed range is trimmed to it, reported in meta.restriction.

Get full access! Get a key at app.ortex.com/apis