Zions Bancorporation Expands Stake in Marsh & McLennan Zions Bancorporation N.A. has bolstered its investment in Marsh & McLennan Companies, increasing its holdings by 26.9% in the fourth quarter. The firm now owns 30,008 shares, valued at $6.37 million. This move aligns with other institutional investors' activity, showcasing continued confidence in the financial services provider.12