Where the amounts or values for the calculation of the total value of financial instruments, financial contracts, or investment funds referencing the benchmark referred to in Articles 1, 2 and 3, are not available or are incomplete, the total value referred to in Article 20(1)(a) of Regulation (EU) 2016/1011 and the total average value referred to in Article 24(1)(a) of that Regulation shall be calculated by using alternative amounts or values, including proxies and amounts or values reported by private providers of information or open interest data calculated and published by market operators, provided that those proxies and amounts or values are of sufficient repute and are sufficiently reliable.

An administrator using alternative amounts or data shall calculate the total amount on a best effort basis and to the best of its ability, based on the available data.

An administrator using alternative amounts or data shall provide the competent authority with a written specification of the data sources used when notifying that competent authority in accordance with Article 24(3) of Regulation (EU) 2016/1011.