One month after buying Mercantile Bancorp., Firstar Corp. is preparing to merge the St. Louis banking company's asset management unit into its own advisory company.

Firstar Investment Research and Management Co. will absorb Mercantile's advisory arm, Mississippi Valley Advisors. The combined unit would manage $34.6 billion of assets -- $25.1 billion of assets from Firstar and $9.5 billion from Mercantile.

Subscribe Now

Access to authoritative analysis and perspective and our data-driven report series.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.