NEW YORK–(BUSINESS WIRE)–Kroll Bond Rating Agency (KBRA) has assigned a senior unsecured debt rating of BBB+, a subordinated debt rating of BBB, and a short-term debt rating of K2 to Pine Bluff, Arkansas based Simmons First National Corporation (NASDAQ: SFNC) (“the Company”). KBRA has also assigned deposit and senior unsecured debt ratings of A-, a subordinated debt rating of BBB+, and short-term deposit and debt ratings of K2 to its subsidiary, Simmons Bank. The Outlook for all long-term rat