Non-Marginable Securities: Reg T vs House
Non-marginable securities carry a 100% cash requirement. Here is where that comes from, how Reg T and house rules differ, and how to check a current one.
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Reg T Margin vs Portfolio Margin Explained
Reg T margin vs portfolio margin: 50% initial and 25% maintenance versus TIMS risk scenarios and the $125,000 minimum, worked through one hedged spread.
Margin for Selling Naked Options: Reg T Math
How much margin does selling a naked option take? The Reg T minimum formula, both branches, worked in a short Python script and on real option chains.