哈勃集团美股招股说明书(2025-10-30版)

Table of Contents The information in this preliminary prospectus supplement is not complete and may change. This preliminary prospectussupplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buythese securities in any jurisdiction where the offer or sale is not permitted. Subject to completion, dated October 30, 2025Preliminary prospectus supplement (to prospectus dated July29, 2025) Hubbell Incorporated $% Senior Notes due Hubbell Incorporated is offering $aggregate principal amount of% Senior Notes due(the “notes”). Interest on thenotes will be payable semi-annually in arrears onandof each year, beginning, 2026. The notes will be ourunsecured, unsubordinated obligations and will rank equally in right of payment with all of our other existing and future unsecured,unsubordinated indebtedness from time to time outstanding. The notes will be redeemable in whole or in part, at our option, at any timeand from time to time prior to the stated maturity date at the redemption prices described in this prospectus supplement. See “Descriptionof notes—Redemption of notes—Optional redemption.” If a Change of Control Triggering Event (as defined herein) occurs, subject tocertain exceptions described in this prospectus supplement, we will be required to make an offer to each holder of the notes to repurchaseall or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of each holder’s notes at a repurchase price equal to101% of the aggregate principal amount of notes repurchased, plus accrued and unpaid interest, if any, on the notes repurchased to, butexcluding, the repurchase date. See “Description of notes—Change of control offer.” The notes will be issued in U.S. dollars and only in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof.The notes will not have the benefit of any sinking fund. Investing in the notes involves risks that are described in the “Risk factors” section of this prospectus supplement beginning onpageS-5. Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved ofthese securities or determined that this prospectus supplement or the accompanying prospectus is accurate or complete. Anyrepresentation to the contrary is a criminal offense. We do not intend to apply for listing of the notes on any securities exchange. Currently, there is no public market for the notes. The underwriters expect to deliver the notes in book-entry form only through the facilities of The Depository Trust Company (“DTC”) and itsparticipants, including Clearstream Banking S.A. and Euroclear Bank SA/NV, against payment in New York, New York on orabout, 2025. Joint book-running managers BofA Securities J.P. Morgan HSBC Table of Contents Table of contents Prospectus supplement About this prospectus supplementIncorporation of certain documents by referenceSummaryRisk factorsUse of proceedsCapitalizationDescription of notesCertain U.S. federal income tax considerationsUnderwritingValidity of NotesExperts Prospectus About this prospectusWhere you can find more informationIncorporation of certain documents by referenceForward-looking statementsHubbell IncorporatedRisk factorsUse of proceedsDescription of capital stockDescription of debt securitiesDescription of warrantsDescription of rightsDescription of unitsPlan of distributionValidity of securitiesExperts Table of Contents About this prospectus supplement This document consists of two parts. The first part is this prospectus supplement, which describes the specific terms of the offering of thenotes. The second part is the accompanying prospectus, which provides more general information, some of which may not be applicableto the offering of the notes. This prospectus supplement and the accompanying prospectus include important information about us, thenotes and other information you should review before investing in the notes. This prospectus supplement also adds, updates and changesinformation contained in the accompanying prospectus. If there is any inconsistency between the information in this prospectussupplement and the accompanying prospectus, you should rely on the information in this prospectus supplement. Before investing in thenotes, you should carefully read both this prospectus supplement and the accompanying prospectus, together with the additionalinformation about us described under “Where You Can Find More Information” in the accompanying prospectus. You should rely only on the information contained or incorporated by reference in this prospectus supplement, theaccompanying prospectus and any free writing prospectus or term sheet we authorize that supplements this prospectussupplement. We have not, and the underwriters have not, authorized any person to provide you with different information. If anyperson other than us provides you with different or inc