NEW YORK–(BUSINESS WIRE)–On November 7, 2017, Kroll Bond Rating Agency (KBRA) assigned a senior unsecured debt rating of A-, subordinated debt rating of BBB+, preferred stock rating of BBB and a short-term debt rating of K2 for Chicago-based, MB Financial, Inc. (NASDAQ:MBFI, “the Company”). KBRA also assigned deposit and senior unsecured debt ratings of A, a subordinated debt rating of A-, and short-term deposit and debt ratings of K1 for its subsidiary, MB Financial Bank, N.A. The Outlook fo