NLY trades at 16.91
sep put @16 = 0.59
sep put @15 = 0.36
Scenario #1, naked put;
Sell 1 @16 = $59 profit, = $309 maintenance margin
Scenario #2, bull put spread;
Sell 1 @16 = $59
Buy 1 @15 = $36
Net = $23, = $17 maintenance margin
You could then load up on number of contracts to outperform the naked put scenario.
Only do this if you are sure offcourse.
Br Gustaf