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

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Filed by a Party other than the Registrant  ☐

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☐ Preliminary Proxy Statement

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

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

Oportun Financial Corporation

(Name of Registrant as Specified In Its Charter)

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

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☐ 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! OPORTUN FINANCIAL CORPORATION 2 CIRCLE STAR WAY SAN CARLOS, CA 94070 OPORTUN FINANCIAL CORPORATION 2022 Annual Meeting Vote by June 13, 2022 8:59 PM PTYou invested in OPORTUN FINANCIAL CORPORATION 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 material for the stockholder meeting to be held on June 14, 2022. Vote Virtually at the Meeting* June 14, 2022 8:00 a.m. Pacific Time Virtually at: www.virtualshareholdermeeting.com/OPRT2022 *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number D84634-P73175 Get informed before you vote View the Combined Document online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 31, 2022. 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 at www.ProxyVote.com 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. Board Recommends Voting Items 1. Election of Class III Directors to serve until the 2025 Annual Meeting of Stockholders Nominees: 1a. Carl Pascarella 1b. Raul Vazquez 1c. R. Neil Williams 2. Ratification of the selection of Deloitte & Touche LLP as our independent registered public accounting firm for the year ending December 31, 2022. 3. To approve, on an advisory non-binding basis, the named executive officer compensation, as described in the proxy statement. For For For For For NOTE: In their discretion, the proxy holders will vote on such other business as may properly come before the meeting or any adjournments or postponements thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. D84635-P73175