@ Gilang:
From the information we obtained, this Zero Markets broker is a group of companies including Zero Financial Pty Ltd and Zero Markets LLC. As for the regulation, there is none, only a statement that Zero Markets LLC is a company registered in St. Vincent and the Grenadines.
For the security of your trading and funds, we recommend choosing a broker that is already regulated by a credible international regulatory body, namely: CFTC, NFA, FCA, FSA, FINMA, MiFID, ASIC and FMA.
Credible regulatory bodies are those that have been tested and internationally recognized, and provide strict sanctions to brokers if they are found to violate agreed terms. These regulatory bodies are also responsible for the security of client funds.