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Do you guys have multicast data showing the adds/removes that demonstrates this phenomenon? If I look at the BATS data closely, when a large order hits, they all get printed off as order executions in the same timestamp. I've never seen one on BATS where the back end just cancels off, or...

I like your videos, but I guess what I'm wondering is: Do you actually make money, or is this some kind of hobby?

If I'm not mistaken, you don't get all the benefits of acting like a registered MM. When they put short restrictions out there, aren't MMs exempt? They were back in 2008, when they were the only ones who could short financials.

I feel like I could turn this into a movie on Lifetime: "Eat, Pray, Lotto", ... featuring Susan Sarandon and Rick Moranis.

Long ago, among some rocky caves and cliffs of France, there was a philosopher and trader who used to trade pelts of animals with the locals. As he was shrewd, he successfully traded himself into trading thousands and thousands of pelts per year and all the locals were in awe of his abilities...

I guess I was curious at what the quarterly reports of a grocery chain looked like, so I looked up the ticker symbol SVU, which is basically a company that runs grocery stores. When I was reading their 10-Q, I saw this paragraph: "The Company applies a fair value based impairment test to the...

Any statistician would tell you the same thing. If you keep adding variables to a regression model, you'll get a higher R^2. That's why there are algorithms and measurements to do model refinement where they penalize the addition of extra explanatory variables.

I liked the post office until I moved to the city where the postal workers at the post office are just so rude. I don't understand why they aren't trained in customer service. I hope they cut the right people.

Market depth has always been a function of volatility. Why would you want to be on the hook for more contracts when the risk the move can go against you hard is so much higher? It's typical to lighten the load in these scenarios. The disruptor thing is cool, but I'd want to see the...

No need to break the country apart, just take power away from the federal government and give it back to the states. Or we could break the states apart further so people get more localized control. Good example: Southern California and Northern California should be two completely different...

I noticed this article: http://online.wsj.com/article/SB10001424053111904233404576458300001332210.html ... And my leasing agent said rents across my city are up 6-8% from last year, partly because of taxes, with the highest occupancy rate in years. Does this mean REITs and other...

Only the Amish trade fairly. The rest are trying to ruin America with their devil machines.

How much money can you really make with expensive HFT hardware and colocation costs if you are trading stocks that only have 30-50k average daily volume? If you average .0050 per share profit and you were 20% of the volume on a 30k stock, you're looking at 30000 * .20 * .0050 = $30? Say, say 5...

You're a good man, ProfLogic. But this post is totally off. Every year I am in this business, some new kid comes out and just amazes me with more quant skills, more programming skills, and more emotionally put together. They are getting smarter and more mentally/skillset integrated, in my...

Screenshot attached.

IB TWS Bug: The "demo" system doesn't allow click traders to click through price and get a fill all the time, meaning the demo is crippled. This only happens some of the time, typically more so on the weekends. If a user logs in with edemo/demouser, occasionally he or she will get a login...

Are people with market maker designations able to get around this?

I'd like to see this for myself. Can you PM me some illiquid name that I can try it out on?

Do they have screenshots of what the other market centers were doing when the "crop-circle bot" was running?

Can you walk through a scenario? You're trying to sell 100 XYZA at 10.01 on, say, ARCA and you're saying someone else comes in with 20000 XYZA on BX at 10.01? Or which venue? If they're willing to take the risk to be displayed, they're taking the risk to be filled. I'm trying to understand...