X0202 SCHEDULE 13D/A 0000918697 XXXXXXXX LIVE 4 Common Stock, par value $0.01 per share 09/01/2026 false 0002014596 20603L102 Concentra Group Holdings Parent, Inc.

5080 Spectrum Drive Suite 1200W Addison TX 75001

Timothy F. Ryan (972) 364-8000 Concentra Group Holdings Parent, Inc. 5080 Spectrum Drive, Suite 1200W Addison TX 75001 Stephen M. Leitzell (215) 994-2621 Dechert LLP 2929 Arch Street Philadelphia PA 19104 0000918697 N Robert A. Ortenzio OO N X1 4663794.00 1984428.00 4763794.00 1984428.00 6648222.00 N 5.2 IN Based on 127,517,736 shares of the Company's common stock outstanding as of July 31, 2026 as disclosed on Issuer's Quarterly Report on Form 10-Q for the quarter ended June 30, 2026 filed on August 6, 2026. Common Stock, par value $0.01 per share Concentra Group Holdings Parent, Inc. 5080 Spectrum Drive Suite 1200W Addison TX 75001 This amendment No. 4 ("Amendment No. 4") to Schedule 13D is being filed on behalf of Robert A. Ortenzio relating to the common stock, par value $0.01 per share (the "Common Stock"), of Concentra Group Holdings Parent, Inc., a Delaware corporation (the "Company"). This Amendment No. 4 modifies the original Schedule 13D filed on December 3, 2024 (as amended and supplemented prior to the filing of this Amendment No. 4, the "Schedule 13D") by Robert A. Ortenzio, a citizen of the United States. This Amendment No. 4 corrects an inadvertent administrative error in the calculation of the number of shares of Common Stock disclosed as beneficially owned in Amendment No. 3 to Schedule 13D filed with the Securities and Exchange Commission on August 24, 2026. Capitalized terms used but not defined in this Amendment No. 4 shall have the meanings set forth in the Schedule 13D. Except as specifically amended by this Amendment No. 4, the Schedule 13D is unchanged. Sections (a) and (b) of Item 5 of the Schedule 13D are hereby replaced with the following information: "(a)-(b) The Reporting Person may be deemed to beneficially own an aggregate of 6,648,222 shares of the Company's common stock. This aggregate represents approximately 5.3% of the shares of the Company's common stock outstanding. The Reporting Person may be deemed to have (a) the sole power to vote or direct the vote of, and to dispose of or to direct the disposition of, 4,663,794 shares of the Company's common stock and (b) the shared power to vote or direct the vote of, and to dispose of or to direct the disposition of, 1,984,428 shares of the Company's common stock (including 882,115 shares of the Company's common stock owned of record by the Robert A. Ortenzio Descendants Trust, 503,455 shares of the Company's common stock owned of record by the Rocco A. Ortenzio Separate Descendants Trust FBO Robert A. Ortenzio, 196,286 shares of the Company's common stock owned of record by the Robert A. Ortenzio 2014 Trust for Bryan A. Ortenzio, 196,286 shares of the Company's common stock owned of record by the Robert A. Ortenzio 2014 Trust for Kevin M. Ortenzio, and 206,286 shares of the Company's common stock owned of record by the Robert A. Ortenzio 2014 Trust for Madeline G. Ortenzio)." Robert A. Ortenzio Robert A. Ortenzio 09/01/2026