X0609 4 2026-06-30 1 0001320414 SELECT MEDICAL HOLDINGS CORP SEM 0001169897 CHERNOW DAVID S false C/O SELECT MEDICAL HOLDINGS CORPORATION 4714 GETTYSBURG ROAD MECHANICSBURG PA 17055 true true false false VICE CHAIRMAN 0 Common Stock 2026-06-30 4 J 0 100000 0 D 777244 D Common Stock 2026-06-30 4 D 0 656823 16.50 D 113421 D Common Stock 2026-06-30 4 F 0 113421 16.50 D 0 D This Form 4 reports securities disposed of under the Agreement and Plan of Merger (the "Merger Agreement"), entered into on March 2, 2026, by and among the Issuer, Stallion Intermediate Corporation ("Parent"), and Stallion MergerSub Corporation (filed as Exhibit 2.1 to the Form 8-K filed with the Securities and Exchange Commission on March 3, 2026). Immediately prior to the effective time of the merger, the Reporting Person contributed 100,000 restricted shares to Parent in exchange for an equivalent amount of restricted shares of Parent, which restricted shares were then exchanged for an equivalent amount of interests in Stallion Group Parent, LP. At the effective time of the merger, each of the Reporting Person's shares of common stock reported in this row of this Form 4 issued and outstanding immediately prior to the effective time of the merger was converted into the right to receive $16.50 per share in cash without interest ("Merger Consideration"). Surrender of shares to satisfy tax withholding obligation incident to vesting of restricted stock. /s/ John F. Duggan, Attorney-in-Fact 2026-07-01