OREANDA-NEWS. National Company KazMunayGas (Astana, hereinafter – the Company), whose shares are officially listed on Kazakhstan Stock Exchange (KASE), has by an official letter informed KASE that "on May 5, 2016 Fitch Ratings downgraded the rating of NC KazMunayGas and its debt securities from "BBB" to "BBB-", outlook stable."