The G-spread index of the total yield of the Russian B/ruB- rated corporate bond market. The G-spread for a single issue is calculated as the arithmetic difference between the yield of a bond and the yield value for a point on the Russian government bond zero coupon yield curve (G-curve) with the same duration. It is calculated on the basis of the most liquid securities of the sector. The share of securities of each issuer in the total capitalization at the time of the quarterly revision of the index list should not exceed 25%.