Sempra shares traded higher during the regular session and extended those gains in after-hours activity, supported by a broader rally in the utility sector. The stock's positive momentum coincided with a ceremony celebrating the opening of a new headquarters for its subsidiary, Southern California Gas Company, in downtown Los Angeles. This company-specific development occurred alongside a general market lift, as the S&P 500 reached a new intraday high on October 6 amid easing Treasury yields and declining oil prices. Peers in the diversified utility industry also saw broad participation in the move, with companies like NiSource and DTE Energy posting gains of 2.8% and 2.5% respectively during the regular session.