The securities activities of large banks and small banks Small banks generally purchase securities and hold them until maturity. Large banks,in contrast,not only buy securities for their own portfolios,but they also frequently: manage a securities trading account manage an underwriting subsidiary that helps municipalities issue debt in the money and capital markets 蔺卧的资土号The securities activities of The securities activities of large banks and small banks large banks and small banks † Small banks generally purchase securities and hold them until maturity. † Large banks, in contrast, not only buy securities for their own portfolios, but they also frequently: „ manage a securities trading account „ manage an underwriting subsidiary that helps municipalities issue debt in the money and capital markets