金融界12月27日消息，A股三大指数收盘涨跌不一，上证公司债AA指数 (HGSZ AA，H11082)上涨0.01%，报255.71点，成交额0.0亿元。
数据统计显示，上证公司债AA指数近一个月上涨0.30%，近三个月上涨1.03%，年至今上涨5.24%。
据了解，上证公司债AA指数属于上证公司债细分指数系列，以上海证券交易所上市的公司债券为样本空间，选取信用级别为AA的公司债券组成样本。该指数以2009年12月31日为基日，以100.0点为基点。
从债项评级分布来看，上证公司债AA指数持仓90.72%为“AA”级债券，9.28%为“AA+”级债券。
资料显示，上证公司债细分指数系列样本每月调整一次，定期调整生效日为每月首个交易日，定期调整数据提取日为生效日前一个交易日。遇临时调整时，若样本券发生摘牌等事件，视情况自事件生效之日起剔除出指数；样本券发生其他事件，参照计算与维护细则处理。
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