UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

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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): October 17, 2024

ESCO TECHNOLOGIES INC.

 (Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: 314-213-7200

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:

¨   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 240.113d-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 (§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. ¨

Increase in Size of Board of Directors; New Director

Pursuant to the previous actions of the Company’s Board of Directors and consistent with the disclosures made in Item 5.02 of the Company’s Form 8-K filed August 7, 2024, effective October 17, 2024 the authorized size of Class II of the Company’s Board of Directors was increased from two to three members, and Penelope M. Conner became a Class II director of the Company filling the vacancy thereby created, to serve for a term ending at the 2025 annual meeting of shareholders. The increase and Ms. Conner’s election were subject to the requisite prior approval by the Federal Energy Regulatory Commission of such position, which was granted on October 17. Ms. Conner also became a member of the Nominating and Corporate Governance Committee of the Board of Directors effective upon the commencement of her term as a director.

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 hereunto duly authorized.