The three ICAP staff are among 47 arrested last currency traders in a high-profile swoop by the FBI week.
ICAP said the trio had not traded on the firm's behalf, and added that its own finances appeared unaffected.
"I believe this to be just an isolated incident of three individuals," said ICAP chief executive Michael Spencer.
"I hope that the issue is resolved rapidly."
The lawyers hired by ICAP to inter-dealer broker, are to investigate the full extent of the employees' alleged activity.
Arrests
The 47 currency traders detained in the FBI raid were later charged with a range of criminal offenses, including fraud.
They include bank staff accused of taking kick-backs to rig transactions So that employers would lose their money, and "boiler room" operators who allegedly sold worthless investments to unsuspecting members of the public.
The FBI swoop netted employees of one other UK brokerage - Tullet Libery, a subsidiary of Collins Stewart - as well as staff at big name Wall Street banks including JP Morgan Chase and UBS.
The companies themselves are not under investigation.
ICAP's announcement came as it unveiled a 47% increase in first half pre-tax profits, and said it was confident of further growth in the month ahead.
"Market conditions remain good for ICAP, and our overall position is very strong," Mr Spencer said.
ICAP shares closed up 5p at £ 13.85.
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