The weighted average effective yield to maturity according to the Russian corporate bond market index is calculated on the basis of a portfolio of fixed coupon rate securities issued in rubles with a remaining maturity of at least 360 days and an issue volume of at least 1 billion rubles. The index includes securities that were quoted on the Cbonds website for at least a third of the trading days of the last quarter and have a credit rating of at least BBB+ from at least one leading rating agency. Quotes are calculated using the Cbonds Estimation Onshore system. The revision of the list of issues forming the index, as well as the inclusion of new issues, is carried out quarterly.