AAON is trading at $82.57, down 4.20%, as hotter-than-expected September inflation weighed on U.S. equities. - Headline CPI rose 3.7% year over year versus 3.6% expected; core CPI reached 2.6%, above the 2.5% forecast. - Treasury yields rose as investors reassessed the interest-rate outlook. Reuters reported the inflation data pushed stock futures lower. - No clear AAON-specific announcement explaining the decline was found; trading volume and activity data are unavailable in the provided price context.