Gotcha. The margin req is approx. 3% on CME fx futures options. Permissions for futures accounts allow for naked shorting of options, provided you have a sufficient margin deposit.
SPAN margin is based on the implied-distro, but for sake of argument you can base the margin req on:
option delta * futures margin = option margin for short sales
SPAN margin is based on the implied-distro, but for sake of argument you can base the margin req on:
option delta * futures margin = option margin for short sales
