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Plus tax....You don't need EVERY equity to back test. Pick and choose. This is what accurate formatted data costs.

Try contacting Livevol: http://www.livevol.com/historical_files.html

The margin requirements for Portfolio Margin accounts are calculated in the same way at all Prime Brokers. This haircut is the minimum assets required for the portfolio. Every broker can then ask for more, but not less capital at their discretion. Many recently have raised margin requirements...

We do. We offer Instinet's platform called TradeSpeed. Instinet has a suite of option algos called "Cobra Options Suite." Here are some options: Cobra Passive: Only pegs to the passive side of the market on randomized destinations and will not sweep at all. Users can choose to display all...

I don't have my own feed. The NYSE charges a lot of money for historical data that will be accurate. Live Vol is a good source of historical data and you can pay for just want you want. http://www.nyxdata.com/Data-Products/NYSE-Arca http://www.livevol.com/historical_files.html I'll...

It sounds to me like what you need is an accurate Open/Close price data source of the primary markets, NYSE, NYSE ARCA and NASDAQ, and the websites you're using don't offer that.

I believe unless your goal is to actively scalp or volatility trade options, you should not look at the options first. Decide on a trading strategy for the security first. You want to be long, short or believe nothing will happen over a period of time with that security. Then, look at the...

If you route your orders to the primary exchange, not a smart or managed route, there is one price that everyone gets. Smart routes and managed routes for open and close don't require best execution because no one know what the market is yet.

People with a REG SHO buy in.

MOO and MOC orders sent to the NYSE all get one price. So what type of slippage are you referring to?

5x margin is not accurate. They will use the same PM calculator as other firms offering PM, but some firms are stricter during times of high volatility. For the most part, PM offer more leverage than Reg-T, unless your buying very cheap options. Reg-T might have a small edge.

CBOE is a good place to research this kind of stuff: http://www.cboe.com/Products/IndexOptions.aspx

ALL equity options and ETF/ETN trade from 9:30 am to 4:00 pm est except the following trade until 4:15 pm est. DIA EEM EFA IWM IWN MDY OEF QQQ SPY UNG UUP VIXM VIXY XHB XLB XLE XLF XLI XLK XLP XLU XLV XLY XME XRT VIIX VXX VXZ

1- You can leg as much as you want, but you'll be at the risk of the market. So for condors, if you think the security is trending up, you can try to sell the put spread near mid market, then offer a limit call spread higher than the offer and hope your right. 2-The floor and the complex...

YRCW is a REG SHO stock, so no one can short it: http://www.nasdaqtrader.com/Trader.aspx?id=RegSHOThreshold CIT traded the same way before it went bankrupt and went to zero. I don't have an opinion on YRCW.

In my opinion, simulated trading will have no value to an investor unless the trading is all systematic, then it will have nominal value. Non-systematic trading that's simulated, has no fear or greed. Without that, no truly have no idea how your behavior will change with real trading.

Your looking to keep records of simulated or real trading?

There are a variety of tools out their that are free, I know ET guys love that, and available on line to see what's happening and look for trading ideas. I just offered two. FINVIZ is not end of day data. The other site has both.

I'm not sure what your asking. He was looking for stocks that were moving a lot or a website to offer trading opportunities. These two websites offer that. They show stocks that day that moved and more.