VOO is trading at $707.11, down 1.13%, as hotter-than-expected inflation revived expectations of a possible October Fed rate hike. - September headline CPI reached 3.7% year over year, above the 3.6% forecast; core CPI also exceeded expectations at 2.6%. - Higher rate expectations lifted Treasury yields and pressured equities, especially rate-sensitive technology stocks. - Bank earnings and semiconductor weakness added volatility, while the wider market was also lower during the open regular session.