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HFT and ES

The Top 8 High Frequency Trading (HFT's) Remove Liquidity 59% of the Time

Passive market making involves buying at the bid, and selling at the ask, which earns the market maker the bid/ask spread. Passive market making provides liquidity, narrows spreads, and lowers trading costs. Aggressive trading removes liquidity: buying at the ask (removes sell orders) and selling at the bid (removes buy orders).

Between September 17, 2010 and November 1, 2010 in the eMini futures contract (December 2010 contract, symbol ESZ0):

41,778 accounts traded this contract
30 of these accounts (less than 1/10th of 1%) met criteria to be classified as HFT.
These 30 HFT accounts:

participated in 46.7% of total trading volume.
grossed $1.51 million per trading day.
Of these 30 HFT, the top 8:

were aggressive 59.2% by volume (the other 22 were aggressive 35.9% by volume).
grossed $793,342 per trading day.

Full article

Interesting point the article makes is that the players will cause a move in the ES but trade the affect on the SPY or other related markets.
Thank you for this information. I have put this to what i already know and thank to you, i should to much better know. I will keep tabs on this topic and indeed, the sub-forum to hopefully find out even more.