# Article 4 — Training **Commission Delegated Regulation (EU) 2016/957 · binding · OJ L 160, 17.6.2016 · dated 9 Mar 2016 [in force]** *In force · Commission Delegated Regulation (EU) 2016/957, OJ L 160, 17.6.2016 · Checked against EUR-Lex on 26 Oct 2026 · [Official source](https://eur-lex.europa.eu/eli/reg_del/2016/957/oj/eng)* 1. Persons professionally arranging or executing transactions and market operators and investment firms operating a trading venue shall organise and provide effective and comprehensive training to the staff involved in the monitoring, detection and identification of orders and transactions that could constitute insider dealing, market manipulation or attempted insider dealing or market manipulation, including the staff involved in the processing of orders and transactions. Such training shall take place on a regular basis and shall be appropriate and proportionate in relation to the scale, size and nature of the business. 2. Market operators and investment firms operating a trading venue shall in addition provide the training referred to in paragraph 1 to staff involved in the prevention of insider dealing, market manipulation or attempted insider dealing or market manipulation.