Executive Change

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): December 29, 2025     FLOWSERVE CORPORATION (Exact Name of Registrant as Specified in its Charter)       New York   1-13179   31-0267900 (State or Other Jurisdiction of Incorporation)   (Commission File Number)   (IRS Employer Identification No.)   5215 N. O’Connor Blvd. , Suite 700 , Irving , Texas   75039 (Address of Principal Executive Offices)   (Zip Code) (972) 443-6500 (Registrant’s telephone number, including area code) N/A (Former Name or Former Address, if Changed Since Last Report)     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, $1.25 Par Value   FLS   New York Stock Exchange 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 ( see General Instruction A.2. below):   ☐ 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)) Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). 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 December 29, 2025, Kenneth I. Siegel informed the Board of Directors (the “Board”) of Flowserve Corporation, a New York corporation (the “Company”), that he would not stand for re-election at the Company’s 2026 annual meeting of shareholders (the “Annual Meeting”). Mr. Siegel will continue to serve as a director until the Annual Meeting. Mr. Siegel’s decision not to stand for re-election was not the result of any disagreement with the management or the Board of the Company. The Board thanks Mr. Siegel for his service and contributions to the Company.   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.       FLOWSERVE CORPORATION Dated: December 30, 2025     By:   /s/ Susan C. Hudson       Susan C. Hudson       Senior Vice President, Chief Legal Officer