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I haven't done algorithmic trading before, but considering some simple strategies. First need to know a bit more about IB's market data access and what is possible with it. I'd need to use an API to get real-time price/quote and volume data for a large amount of stocks (e.g. all Russell3000...

A follow-up question: is it perfectly legal for one person to trade simultaneously through 1) an individual account and 2) a business account with the same broker? Reason for asking this is that in many countries, long-term investment returns are not taxed or the tax is low, whereas short-term...

Do you mean that brokers won't allow converting and you would need to open a new account?

Does anything significantly change in the client-broker relationship if you move from trading as an individual to trading as a private/limited company? Technically not a fund (no clients), but simply a business started for managing your own money and/or family money. The taxation of an...

I'm fairly new to trading and the stock market, but I know that analyst publications (estimates and recommendations) can move the price of a stock by a lot in an instant. Therefore, I think it becomes somewhat of a risk management issue. I know that analysts should not disclose any of the...

Could you explain this in a bit more detailed way to a novice such as myself? I'm mainly interested in the imbalances and predicted prices so that I can more accurately place limit orders at open or close (this matters mostly for smaller stocks).

I remember reading somewhere that before the market opens, exchanges publish order imbalance and even information about what the opening price would be, given the current orders? How well does this hold in practice, and where could I access this data? The information would help placing limit...

You are correct, I would only need to modify the existing order. I'm just beginning to learn about these things and proper terminology, and this detail was not entirely clear to me.

It does not nullify them. I'm stupid and I need to learn. And I have, thanks to replies in this thread. By the way, Nasdaq website should be trustworthy and it seems to provide lots of data. So technically, what is wrong with thinking about scraping the site for real-time snapshots? The result...

Is Yahoo ok for real-time price data these days? (I wouldn't use it for backtesting either, but thinking about getting real-time snapshots) I remember years ago it was possible to download data for a large number of stocks at once - still possible today?

Thanks, will consider IQFeed. If I were to collect my own (real-time) price data (1-minute intervals), which source/website would be best to use? Would exchange websites such as nasdaq.com be the most reliable? Data seems to be free there, if you can build a program that scrapes the site...

Is IQFeed very high quality? Especially for the live feed, there cannot be regular missing values or even occasional errors. Does the feed allow downloading real-time trade data updating multiple times for hundreds of different stocks within a 5-minute window, for example?

I've been thinking about buying intraday historical data for stocks for backtesting strategies. However, high quality tick data is expensive, and what I'd like to do is first pay for collected data, but then start building my own database by automatically downloading data from a website (or a...

Thanks, I was not aware of that. Does this mean that all cancelled orders incur a cancellation fee (regardless of whether they are placing using the API)? Execution credit is 25 x cancellation fee, so you are allowed to cancel 25 times as many orders as are filled without any cost? Am I...

For any particular stock, cancelling/reordering max. few times per minute. However, I'm considering applying the same strategy for multiple stocks simultaneously, so combined it might be 100 stocks, and for each might need to cancel/reorder a couple of times within a 5-minute window, for...

Is this common? Do you know if, for example, IB, restricts this type of activity and for what reason? As you can probably tell, I'm trying to get a better grasp of how things work in this field. Can you recommend a website or another source that gives an overview of what is/is not allowed in...

Not really, because I might need to cancel the order and place a new at a slightly higher/lower level if I need the order to be executed quickly. I would think it is more like trying multiple times to get the order filled at different levels. For example, Current bid/ask is at 100/101. -> First...

I'm new to trading and especially automated/algorithmic trading. However, I have some programming skills and have been thinking about experimenting with some strategies. A couple of questions regarding rules/law: First, can one place a limit order to buy a stock, cancel the order quickly if it...

Thanks! For NYSE fees, for example, there is a difference between different "tapes" (A, B, C). I have no idea what these are? These have different fees attached to them. Does one select between the tapes when placing an order, or how does this work? Also, is there some kind of smart order...

I'm a beginner and have been taking a look at different brokers and their commissions. For stock trading, Interactive Brokers offers a tiered system, where, in addition to a volume based fee, exchange fees are calculated separately. As far as I can understand, if you add liquidity, meaning...