# Article 12 — Open interest (Article 57(3) of Directive 2014/65/EU) **Commission Delegated Regulation (EU) 2017/591 · superseded — not in force · OJ L 87, 31.3.2017 · dated 1 Dec 2016 [no longer in force]** *No longer in force · Commission Delegated Regulation (EU) 2017/591, OJ L 87, 31.3.2017 · Checked against EUR-Lex on 26 Oct 2026 · [Official source](https://eur-lex.europa.eu/eli/reg_del/2017/591/oj/eng)* Competent authorities shall calculate the open interest in a commodity derivative by aggregating the number of lots of that commodity derivative that are outstanding on trading venues at a point in time.