When a ticker symbol changes, the historical quote data is only available from the date the symbol changed. For example:
FXCM became GLBR on 2/27/2017
Historical quote data only visible from that date
The page http://seekingalpha.com/symbol/FXCM/key-data/historical-quotes no longer exists so it's impossible to see the historical quotes for when the company used the symbol FXCM.
The chart does show the price all the way back before the FXCM >> GLBR quote change, though.
Customer support service by UserEcho