UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No.    )

Filed by the Registrant  ☒

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

☒ Definitive Additional Materials

☐ Soliciting Material under §240.14a-12

OWL ROCK CAPITAL CORPORATION II

(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 the appropriate box):

☒ 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! OWL ROCK CAPITAL CORPORATION II 2022 Annual Meeting Vote by June 28, 2022 11:59 PM ET D79690-P74014 You invested in OWL ROCK CAPITAL CORPORATION II 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 shareholder meeting to be held on June 29, 2022. The Annual Meeting will be a completely virtual meeting, which will be conducted via live webcast at www.virtualshareholdermeeting.com/ORCCII2022. Get informed before you vote View the Notice and Proxy Statement and Form 10-K online at www.ProxyVote.com OR you can receive a free paper or email copy of the material(s) by requesting prior to June 15, 2022. If you would like to request a copy of the material(s) for this and/or future shareholder 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. There is no charge for requesting a copy. 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* June 29, 2022 9:30 A.M. Eastern Time Virtually at: www.virtualshareholdermeeting.com/ORCCII2022

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items Board Recommends 1. To elect each of Edward D’Alelio and Craig W. Packer to the board of directors of Owl Rock Capital Corporation II (the “Company”) for three-year terms, each expiring at the 2025 annual meeting of shareholders and until their successors are duly elected and qualified; Nominees: 1a. Edward D’Alelio 1b. Craig W. Packer 2. To ratify the appointment of KPMG LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2022; and 3. To consider and transact such other business as may properly come before the Annual Meeting, and 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”. D79691-P74014