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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☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material under §240.14a-12

OAKTREE SPECIALTY LENDING 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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OAKTREE OCSL | Specialty Lending Corporation OAKTREE SPECIALTY LENDING CORPORATION 333 SOUTH GRAND AVENUE, 28TH FLOOR LOS ANGELES, CA 90071 D65684-P64937 Your Vote Counts! OAKTREE SPECIALTY LENDING CORPORATION 2022 Annual Meeting Vote by March 3, 2022 11:59 PM ET You invested in OAKTREE SPECIALTY LENDING 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 March 4, 2022. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to February 18, 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. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* March 4, 2022 10:30 a.m. Pacific Time Virtually at: www.virtualshareholdermeeting.com/ocsl|2022 *Please check the meeting materials for any special requirements for meeting attendance.V1.1

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. Voting Items Board Recommends 1. To elect one director of the Company, who will serve until the Company’s 2025 Annual Meeting of Stockholders and until her successor is duly elected and qualifies: Nominee:1a. Phyllis Caldwell For 2. To ratify the appointment of Ernst & Young LLP as the Independent Registered Public Accounting Firm for the Company for the fiscal year ending September 30, 2022. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. D65685-P64937