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Algorithmic trading has two meanings: - the process of taking in inputs such as market data, current news, and producing orders without human intervention. - the process of optimising the trading of a large order or the market making process.

4 votes
Accepted

Algo's Shadowing Limit Orders

There's nothing nefarious going on here, it's simply a market maker ensuring they get their fair share (Hah!). Pro-rata allocation at many options exchanges mean market makers simply have to match you …
Louis Marascio's user avatar
3 votes

Real-time & Fast S&P 500 E-Mini Futures (ES) Data

Another DTN product, Nanex NxCore is a very good choice for a high-quality "retail" feed. It will suffer from the standard latency issues of transporting the feed across the internet, but it is likely …
Louis Marascio's user avatar
4 votes
Accepted

Why is random trading minus transaction costs not zero expected value?

Assuming the following: You consider bid/ask spread to be a transaction cost. That you're interested in passive trading since you mentioned adverse selection. As a random passive trader you simply p …
Louis Marascio's user avatar
3 votes
Accepted

How is the Order priority of an Iceberg order decided?

No. 10 shares from Order1 have time priority. The 100 shares of Order2 will trader after 10 from Order1. The 90 hidden shares of Order1 are hidden, and therefore at the back of the queue. When they li …
Louis Marascio's user avatar
3 votes

Cross Bid and Ask prices for Forex trading

Where are you sourcing your data from? In the equities markets you will see crossed/locked markets at the NBBO if consuming direct feeds from each venue. You typically will not see it at a specific ve …
Louis Marascio's user avatar
1 vote
Accepted

Distinguish between market makers and other participants?

It's got nothing to do with you being identified as a market maker or not. It is simply that the other participants at that time are passive traders. The choice between hitting a bid or lighting a new …
Louis Marascio's user avatar
4 votes

Techniques to optimize the placement of orders in market making strategy?

It sounds like you're trying to filter your input event stream so as to reduce noise. By reducing noise you'll reduce the number of cancel/replace's you're doing and, hopefully, have a better order-to …
Louis Marascio's user avatar
2 votes
Accepted

Which brokers offer a Python stock trading API?

I know of no broker that provides an official, supported Python API. If you are at Interactive Brokers you can consider using their FIX gateway, but that comes with additional cost. QuickFix provides …
Louis Marascio's user avatar
1 vote
Accepted

adjusted close prices on SP500

Adjusted series are cumulative of all events that happen after the date. Meaning, if you look at the prices on 2009-09-30, the adjusted close represents all corporate actions that happen after this da …
Louis Marascio's user avatar