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Because everyone knows this already Surf.

Highly likely this was a preexisting condition that wasn't previously diagnosed. A lot of people have weird heart issues that they don't otherwise know are present unless they're specifically seeking diagnosis of them. I myself had a bundle block that was only diagnosed after seeing a...

Not a stock trader myself but I've heard Bright trading is down this alley particularly when it comes to intraday leverage.

Question about native spreads and order books. Since I've often heard of native spreads being a "separate" book, do positions put on using native spreads affect the main order book in any way? I'd presume if one put on a 100 lot spread position it's going to affect the individual legs directly...

Amazing, who would have thought of such a scheme like "meeting in person" such that there was no electronic communication trail. I bet it was at the golf course. Oh how we wish this would be the case. You know how this world works. BTW: It's more fun to read Matt Levine's take on it...

Not really giving anything away that nobody doesn't already know... * Larger time window market profile/volume profile chart to have a feeling for where "value" is/has been over some multi-month period + a day-to-day multi-mp/vp chart. * General trading chart (usually something like 200-700...

So what exactly does this mean? You put a trade on and it goes 1 tick against you? How is that not entirely normal? Post a chart with what you're talking about or a more specific situation might be helpful.

A combination of patience, discipline, and balls.

MP/VP, constant volume charts (averaging around ~5-15m and 1h windows) with DOM overlay, bid/ask footprint charts. I buy low, sell high, sell high, buy low and try to know when that isn't the right thing to do without getting too screwed in the process.

So I finally got around to looking into these and will share some thoughts on why I think every single one of them would have been a bad signal to follow from the "obvious" side. (for note, my timezone is Pacific time, which is a -8h delta from you) In the above video, you see a large...

What's your timeframe?

Because your questions are a: vague, b: context-specific, c: situational dependent. You're asking questions as if the answers are absolutes when they most assuredly aren't.

This isn't directly about skimmers - it's about asymmetric prosecution and the regulators not doing their job on a scale that matters.

Okay let me sum up this thread:

You'll notice though that not a single institutional or well known HFT firm will be prosecuted for anything significant.

You gotta be kidding. Mom and pop are consistently fucked over countless times throughout the years (2000, 2008). The media is used to help facilitate that as well. I don't think someone is a "strong hand" holding through 50-60% retracing market wide fire sales.

http://en.wikipedia.org/wiki/Gary_Gensler: "After earning an MBA, Gensler joined the Wall Street investment bank Goldman Sachs, where he spent 18 years working up the ranks.[8] At 30, Gensler became one of the youngest persons to have made partner at the firm at the time.[9] He spent the 1980s...

Yeah you'd figure their margin calculation would take into account a MAX() function of some sort. Meaning margin required can never be larger than the intrinsic value of the actual contracts being traded.

Then you'll probably have to write your own. IB has an API and really, an auto-spreader can't be *that* hard. Have you tried simply using their combo support for basic stuff?

Flash Crash Scapegoat Nav Sarao Complained More Than 100 Times About The Real Market Manipulators Several weeks ago, when the CFTC and DOJ's laughable attempt to scapegoat the May 2010 flash crash on the actions of a live-in-his-parents-basement UK trader, we explained "Why Sarao Is The Flash...