HUBB: Company disclosure · Other company developments

Item 7.01 Regulation FD Disclosure. On June 9, 2026, Hubbell issued a press release, attached as Exhibit 99.1 to this Current Report on Form 8-K, announcing the completion of the NSI Acquisition. The information in Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1, 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 filing. Item 8.01 Other Events. On June 9, 2026, Hubbell completed the NSI Acquisition. NSI Industries is a provider of electrical fittings, connectors, components and wire management products serving industrial, infrastructure and commercial markets. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit No. Document Description 99.1 Press Release dated June 9, 2026. 104 Cover Page Interactive Data File (formatted as Inline XBRL). 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. HUBBELL INCORPORATED By: /s/ Katherine A. Lane Name: Katherine A. Lane Title: Executive Vice President, General Counsel and Secretary Date: June 9, 2026