Quote from InvestVision:
High-frequency trading
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exchanges paying 14 cents/100 shares to MMs is NEWS to me, anybody know what NYMEX pays for CL Market Makers ???,
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here's an example: A high-frequency trader (HFT) who has a layered series of bids and offers on IBM might buy 100 shares of IBM for, say $128.59, and sell it a fraction of a second later for $128.60. The profit: $1.00 (100 shares at a profit of $0.01).
But there's more. Exchanges pay rebates to provide liquidity (offers to buy and sell stock). An exchange might pay, say, 14 cents per hundred shares.
So in this example, the HFT would make $1.00 trading the spread, plus a 14 cent rebate for providing a bid (offer to buy) and another 14 cents for an "ask" (offer to sell).
http://www.cnbc.com/id/39041598
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- High-frequency trading is the main reason volume on the NYSE has increased 150 percent in five years.
Who's trading? Here's the latest breakdown of daily volume (source: Tabb Group):
High-Frequency Trading: 56 percent (includes proprietary trading shops, market makers, and high-frequency trading hedge funds)
Institutional: 17 percent (mutual funds, pensions, asset managers)
Hedge Funds: 15 percent
Retail: 11 percent
Other: 1 percent (non-proprietary banking)
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Quote from BCE:
Amazing volatility. Shorted 99.74, covered at 99.24. BBL. Good trading everyone.

Quote from zxd:
Why is the spread between Dec 11 WTI and Dec 12 WTI a negative -1.55? And another question, what is the effect on margin requirements for trading a spread. If I long and short a contract, will I have to have 2x the margin requirement or will it count as one contract?
In the computer information systems department that I've been taking some classes from they say, "Devious minds think alike."Quote from NoDoji:
Hey, great minds think alike, I was short almost same time as you 99.79, out 99.21, but didn't it seem like an eternity (a good 2 or 3 minutes) waiting for the break through previous S and then those pesky buyers stepped in!![]()
My trade was from 7:04 to 7:08 AM PST. Same as yours? I was just looking at the 1 min and it retraced that same trade 2 or 3 more times during the day. It was so volatile, I just wanted to take as big of a chunk as I could but left about 30 more ticks on the board. Oh, well.
) Off to bed. Good trading to all of you overnight traders. 
Quote from BCE:
In the computer information systems department that I've been taking some classes from they say, "Devious minds think alike."My trade was from 7:04 to 7:08 AM PST. Same as yours? I was just looking at the 1 min and it retraced that same trade 2 or 3 more times during the day. It was so volatile, I just wanted to take as big of a chunk as I could but left about 30 more ticks on the board. Oh, well.
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Quote from InvestVision:
- from this 97.50 price , next overnight session should provide run up to 99 as it is next new day for Libya and events ..
- smart money swing Trade 'Mark down' , 'Accumulation' is done , next day is MarkUP ..