 GLEN ALLEN, Va.--BUSINESS WIRE--Dynex Capital, Inc. NYSE: DX announced today the promotion of Smriti L. Popenoe to President, effective immediately. Ms. Popenoes 27-year career in finance and capital markets spans a broad range of financial institutions with experience across multiple business and market cycles. She spent the last six years at Dynex Capital, Inc., serving as Executive Vice President, Co-Chief Investment Officer. Ms. Popenoe will retain her Co-Chief Investment Officer dutie 