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Charts are for people. A computer doesn't need to visualize data

imo sophisticated technology and stuff is essential

I was think TEA was a short when it first started trading at the buyout number. It was still easy to borrow and and it seemed like trading high about the 15.50 number was unlikely.

I didn't think anyone who knows what fix is, is interested in candlesticks.

Payment for order flow doesn't hurt investors. If I want to buy GE and the market is 21.05 x 21.06, I'll get filled at 25.06. It only hurts the traders offering .06, which is mostly professional traders.

I suspect its possible to turn some good volume and profit while doing so but it sounds like a major part of the strategy is holding through drawdown/adverse selection. For instance if your portfolio is 65% long 35% short, you can make two choices. A) offer aggressively on your longs...

It seems like you would be extremely exposed to adverse selection. For example if you start the day with no positions, and post bids and offers, the most likely outcome is your portfolio getting very long or short.

I don't understand the notion of market making as a portfolio, unless you're holding inventory for large periods of time. If you are only turning over your inventory once per day, I don't really understand how you decide to bid or offer. I would think that you would want to on the bid or offer...

Yeah, I often see the bid get swept and the offers keep pennying each other and walk the offer down. Which makes it hard to believe that anyone is making money.

Anyone have any insights? I've been trying to study this, at it seems to me that in a lot of the wider spread symbols, you have to deal a lot with adverse selection. As in if you are trying to buy the bid, when you get filled the offer moves down drastically. I've put some thought into hedging...

That doesn't sound like a bug but more like a latency related problem

40.09 was the NYSE opening print. What you're referring to as the official open is probably the first print after 9:30. Since the first print is merely the first trade, there's no way to guarantee a buy or sell at that price.

Heading towards zero has nothing to do with tracking errors. It's due to costs and maintenance fees.

That was pretty sick. Down 43% since yesterday's close.

not seeing what I expected...

I don't use sterling but it sounds like a rounding error.

Are you saying quote after hours to catch people crossing huge spreads? I've tried that a couple times but have never been hit, I've been thinking about automating it.

Almost everything I do is automated, so by no means am I set on trading by hand

Those are all internalized trades which are only really visible on barcode symbols. There's really nothing you can do about it.

By technology do you also include developers? That would make a little more sense.