UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 ý Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended September 30, 2023 OR Form 10-Q TENET HEALTHCARE CORPORATION (Exact name of Registrant as specified in its charter) Nevada (State of Incorporation) 95-2557091 (IRS Employer Identification No.) 14201 Dallas Parkway Dallas, TX 75254 (Address of principal executive offices, including zip code) (469) 893-2200 (Registrant's ...