The first group of investors of REIT consists of persons purchasing trust units in the initial public offering (IPO) through the underwriter(s). The SEC does not specify the rules regarding allocation units, but the SEC permits any one investor or group of investors to invest in not more than 50% of the total trust units and of each tranche (if any).

After the IPO, the unit holders may trade the trust units on the SET by opening a trading account with a broker, similar to when trading securities. A REIT is traded under the real estate and construction sector in the property fund section.