# Article 5 — Investigation of complaints **Commission Delegated Regulation (EU) 2025/294 · binding · OJ L, 2025/294, 13.2.2025 · dated 1 Oct 2024 [in force]** *In force · Commission Delegated Regulation (EU) 2025/294, OJ L, 2025/294, 13.2.2025 · Checked against EUR-Lex on 26 Oct 2026 · [Official source](https://eur-lex.europa.eu/eli/reg_del/2025/294/oj/eng)* 1. Upon receipt of an admissible complaint, crypto-asset service providers shall, without undue delay after acknowledging receipt of the complaint, assess whether the complaint is clear and complete. In particular, crypto asset service providers shall assess whether the complaint contains all information required. Where a crypto-asset service provider concludes that a complaint is unclear or incomplete, it shall request any additional information necessary for the proper handling of the complaint. 2. Crypto-asset service providers shall seek to gather and examine all relevant information regarding a complaint. Crypto asset service providers shall not require from the complainant information that is already in their possession or that is legally required to be in their possession. Crypto-asset service providers shall keep the complainant duly informed about any additional steps taken to handle the complaint. Crypto asset service providers shall reply to reasonable information requests made by the complainant without any undue delay.