Naked Short Options

[renerivkin]

First Post, go easy on me!

i am new to the US derivative markets and am interested in the margin requirements of option writing.

Specifically, who enforces margins on uncovered option writes (both put and call), is it the broker individually or is it a government regulator.

i note that different brokers vary the margin requirements with the strategy implemented but i am yet to find a strategy for naked writing that nullifies the margin requirements.

Also, are there any derivative markets subject to broker enforced (i.e. not govt. regulated) margin requirements incl commodity, forex etc.

Thanks, RR