Short interest

The general term for how much of a company's share capital is held short; each regime measures it differently.

In the United States, short interest is a count of shares: the total number of shares sold short and not yet covered, as reported by broker-dealers to FINRA twice a month. Expressed as a percentage, it is usually divided by shares outstanding (as on this site) or by the public float (as on many estimate sites), which is why two sources can show different percentages for the same stock on the same date.

In the UK, Australia and the EU the published figures are aggregates of disclosed positions rather than a census of shares borrowed, so the same phrase covers measurements that are not directly comparable. Each market page on this site says which measurement it shows.

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