Firstar Bank, Milwaukee, has rounded out its mutual fund menu with a fund that invests in small companies-a sector that has lagged the rest of the booming stock market.

The Portico Emerging Growth Fund opened Aug. 15 and manages about $35 million of assets. It will invest in undervalued companies with market capitalizations between $250 million and $2 billion, said Todd Krieg, a fund co-manager.

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