Exhibit 99.1

Joint Filing Agreement

This will confirm the agreement by and among all the undersigned that the Amendment 3 to Original Schedule 13D filed on or about this date and any amendments thereto with respect to the beneficial ownership by the undersigned of shares of common stock, par value $0.01 per share, of TCG BDC II, Inc. is being filed on behalf of each of the undersigned in accordance with Rule 13d-1(k)(1). This agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Dated: September 19, 2019

THE NATIONAL COMMERCIAL BANK

By: /s/ Reem Al Majed

Name: Reem Al Majed

Title: Treasurer, Bahrain Branch

By: /s/ Ali K. Shubbar

Name: Ali K. Shubbar

Title: Head, Treasury Operations & Bahrain Operations

NCB CAPITAL COMPANY

By: /s/ Wisam Fasihaldin

Name: Wisam Fasihaldin

Title: Chief Finance Officer