UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No.     )

Filed by the Registrant x

Filed by a party other than the Registrant ¨

Check the appropriate box:

¨  Preliminary Proxy Statement

¨  Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨  Definitive Proxy Statement

x  Definitive Additional Materials

¨  Soliciting Material under §240.14a-12

OneMain Holdings, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

x  No fee required.

¨ Fee paid previously with preliminary materials.

¨ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

Your Vote Counts! Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V46096-P11064 ONEMAIN HOLDINGS, INC. CORPORATE SECRETARY ATTN: LEGAL DEPARTMENT 601 NW SECOND STREET EVANSVILLE, IN 47708 ONEMAIN HOLDINGS, INC. 2024 Annual Meeting Vote by June 11, 2024 11:59 PM ET You invested in ONEMAIN HOLDINGS, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on June 12, 2024. Get informed before you vote View the Notice and Proxy Statement and the 2023 Annual Report to Stockholders online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 29, 2024. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote in Person at the Meeting* June 12, 2024 9:30 AM CT 601 NW Second Street Evansville, IN 47708 *Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares.

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V46097-P11064 Voting Items Board Recommends THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. To elect three Class II directors to serve until the 2027 Annual Meeting of Stockholders. Nominees: 1a. Philip L. Bronner For 1b. Toos N. Daruvala For 1c. Douglas H. Shulman For 2. To ratify the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm for OneMain Holdings, Inc. for the year ending December 31, 2024. For NOTE: The proxies are authorized to vote at their discretion upon any other matter that may properly come before the meeting or any adjournments or postponements thereof.