UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

current report

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 28, 2026

SELECT MEDICAL HOLDINGS CORPORATION

(Exact name of registrant as specified in its charter)

4714 Gettysburg Road, P.O. Box 2034

Mechanicsburg, PA 17055

(Address of principal executive offices)  (Zip Code)

(717) 972-1100

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether either registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if either registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

On April 30, 2026, Select Medical Holdings Corporation (the “Company”) issued a press release announcing its financial results for its first quarter ended March 31, 2026 (the “Press Release”). A copy of the Press Release and the attached financial schedules are attached as Exhibit 99.1 to this report and incorporated herein by reference.

The information in this report (including Exhibit 99.1) is being furnished pursuant to Item 2.02 and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act.

On April, 28 2026, the Human Capital and Compensation Committee of the Board of Directors of the Company (the “Compensation Committee”) approved the deferral of the scheduled vesting dates of certain previously granted equity awards held by Robert A. Ortenzio, our Executive Chairman and Co-Founder, and Martin F. Jackson, our Senior Executive Vice President, Strategic Finance and Operations. The equity awards subject to the Compensation Committee’s action were granted under the Company’s 2020 Equity Incentive Plan on the dates set forth below. Pursuant to the Compensation Committee’s action, the scheduled vesting dates of the following tranches of such equity awards were each delayed by one year, in each case subject to the applicable individual’s continued service with the Company through the applicable deferred vesting date:

Dividend Declaration

On April 29, 2026, the Company’s board of directors declared a cash dividend of $0.0625 per share. The dividend will be payable on or about May 28, 2026 to stockholders of record as of the close of business on May 14, 2026.

(d) Exhibits.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.