The company's lawyer, Michael Locke, said the deregistration was wrong and that the FMA had made an error of law.
Locke referred to an FMA letter concerning the deregistration which claimed any financial services provided by Excelsior were done so from outside New Zealand.
The FMA, according to Locke, considered the registration of Excelsior on the FSPR was likely to create a false of misleading appearance that it provided financial services from New Zealand or that the provision of these services to clients are regulated by New Zealand law.
Locke said that while Excelsior currently had no New Zealand clients, it had been offering services to local customers.
All present clients were from South Asia, he said.
While Excelsior's "meta trader" software platform was based on overseas servers, the company's office was in New Zealand, orders from clients were taken here, the administrative work was done in this country and it had a local director, Locke said.
He said the FMA had "simply closed their mind" to the question of what Excelsior was doing for overseas clients.
The firm was regulated by the FMA to the extent that it could deregister them from the FSPR, Locke said.
"The FMA in short has the power to close down financial service providers," he said.
The hearing, before Justice Gerald Nation, continues.