UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 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 Pursuant to §240.14a-12. TCG BDC, 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 the appropriate box):  No fee required.  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11. (1) Title of each class of securities to which transaction applies: (2) Aggregate number of securities to which transaction applies: (3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined): (4) Proposed maximum aggregate value of transaction: (5) Total fee paid:  Fee paid previously with preliminary materials.  Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing. (1) Amount Previously Paid: (2) Form, Schedule or Registration Statement No.: (3) Filing Party: (4) Date Filed:

NOTICE OF ADJOURNMENT OF SPECIAL MEETING - PLEASE VOTE YOUR PROXY TODAY September 30, 2020 Dear Fellow Stockholder: This important notice is to inform you that because of the lack of votes received that are necessary to constitute a quorum, the Special Meeting has been adjourned until October 28, 2020 at 8:30 a.m., Eastern time, to allow stockholders additional time to exercise their voting rights by submitting their voting instructions. The adjourned meeting will be held virtually at The purpose of the adjourned special meeting is to vote upon a proposal to authorize the Company to sell or otherwise issue shares of its common stock at a price below its then-current net asset value. This letter is being sent to you because you held shares of the Company on the record date and we have not yet received your vote. In order to avoid further delay of the meeting, please vote today. Your vote is extremely important, no matter how many shares you hold or how you choose to vote. For the reasons set forth in the proxy statement, dated August 6, 2020, the Board of Directors recommends that you vote “FOR” the Proposal. Please vote via the internet or phone as soon as possible or alternatively, please sign, date, and return the enclosed proxy card. If you need assistance voting your shares, please call D.F. King toll-free at (866) 304-5477 or collect at (212) 269-5550. On behalf of your Board of Directors, thank you for your cooperation and continued support. Sincerely, Linda Pace Chief Executive Officer, President and Chair