NEW YORK--(BUSINESS WIRE)--Why: Rosen Law Firm, a global investor rights law firm, announces an investigation of potential securities claims on behalf of shareholders of Zions Bancorporation, N.A. (NASDAQ: ZION, ZIONP) resulting from allegations that Zions Bancorporation, N.A. may have issued materially misleading business information to the investing public. So What: If you purchased Zions Bancorporation, N.A. securities you may be entitled to compensation without payment of any out of pocket. ...