thanks...can you just interpret one thing for me. what does that mean for trading es as spec $4500. need to put up $4500 to buy 1 contract?
That is correct. Brokers are free to require more at any time, but they may not legally require less.
Maintenance margin of $3600 means that you can have a $900 per contract drawdown before you get a margin call. Some brokers (e.g. IB) don't issue margin calls. They just dump your position without consulting you. Their standard agreement allows them to do this. You did READ that agreement didn't you?
This is not ENTIRELY true. Brokers/clearing agents can require ANY AMOUNT, LOWER or HIGHER, for INTRADAY TRADING. Intraday meaning the position is closed by end of day, or more specifically, BEFORE the EXCHANGE daily accounting procedure takes place. There are MANY brokerages that offer 50%, 25%, and even less of the EXCHANGE MINIMUM for INTRADAY TRADING. This is completely legal. Good trading to all, and a Happy New Year! Osorico