It is better to have accounts with several brokers considering the fact that forex market is highly unregulated. Nobody known when a forex broker will shut down. Even though there are highly reliable brokers, still it is better to have at least two accounts with top class brokers when we are investing large sums of money. Additionally, we can directly open account through trading desk of a bank without dealing with brokers. This is possible when we invest well over 10million dollars. However, managing two accounts is not easy as far as my experience goes. We should treat one as the main account where most of the trading should take place while the second one should be used occasionally. However, the profits can be shifted in such a way that both accounts have same quantum of money.