The weighted average yield to maturity according to the UK corporate Bond and Eurobond market index is calculated based on a portfolio of fixed coupon rate securities issued in GBP with a remaining maturity of at least 360 days and an issue volume of at least 500 million pounds. The index includes securities that were quoted on the Cbonds website for at least 16 trading days last month and have a credit rating of at least B3/B from at least two leading rating agencies. The revision of the list of issues forming the index, as well as the inclusion of new issues, is carried out monthly.