Investment Securities in Sanibel are defined as the services that are purchased in order to be held for investment. This is in contrast to securities that are purchased by a broker-dealer or other intermediary for resale. Marketable securities are often purchased by banks to hold in their portfolios. These securities ,held by banks, are usually one of two main sources of revenue, along with loans. Investment securities also serve banks with a source of liquidity along with the profits from realized capital gains when they are sold. In Sanibel, quite a large number of agencies provide Investment security services.