Executive Change · Reg FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 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): March 17, 2026     Parsons Corporation (Exact name of Registrant as Specified in Its Charter)     Delaware 001-07782 95-3232481 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.)           14291 Park Meadow Drive, Suite 100   Chantilly , Virginia   20151 (Address of Principal Executive Offices)   (Zip Code)   Registrant’s Telephone Number, Including Area Code: (703) 988-8500   Not Applicable (Former Name or Former Address, if Changed Since Last Report)   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: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class   Trading Symbol(s)   Name of each exchange on which registered Common Stock, $1 par value   PSN   New York Stock Exchange Indicate by check mark whether the 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 the 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. ☐   Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On March 17, 2026, Susan Balaguer, the Chief Human Resources Officer (“CHRO”) of Parsons Corporation (the “Corporation”) announced her retirement as CHRO, effective April 1, 2026. Ms. Balaguer will remain with the Corporation in an advisory role for a transition period through the end of May 2026. The Board of Directors of the Corporation has approved a one-time $250,000 cash bonus to be paid to Ms. Balaguer as part of her final payment for service with the Corporation. Item 7.01 Regulation FD Disclosure. On March 17, 2026, the Corporation issued a press release regarding the appointment of Soo Lagasse as the Corporation’s CHRO, effective April 1, 2026. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.   The information in this Item 7.01 and Exhibit 99.1 furnished hereto shall not be deemed “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 incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits: The following exhibit is furnished as part of this Report pursuant to Item 7.01.   99.1 Press Release Dated March 17, 2026, announcing the Company’s appointment of Chief Human Resource Officer. SIGNATURES 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 hereunto duly authorized.       Parsons Corporation         Date: March 17, 2026 By: /s/ John T. Martinez       John T. Martinez Chief Legal Officer and Corporate Secretary