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Okay, I'm following. Ouch...

I guess what I'm really asking is: is he somehow losing more than the "theoretical" max loss on the put credit spread?

Don't most brokers immediately liquidate long stock accrued as the result of short put exercise?

I'd be curious to hear where your strikes were? A bull put is supposed to be a limited risk credit spread...how'd you lose 80% of your account on them? Shorts way ITM and longs way OTM? Am I missing something about what happens during assignment? I'd assume your broker sold the stuck you...

Isn't a price ladder just a method of viewing Level 2 data?

https://www.tdameritrade.com/api.page

Anyone here used both and have an opinion on which you prefer? I played with the IB C++ API a handful of years ago, and it was easy enough to use, but I haven't any experience with TD. I know that many of you seem to prefer ToS over IB TWS...so wanted to get your thoughts on the TD API. I...

Combination of python and c++ is what I use, and subsequently recommend. It is a myth that python is slow. Poorly written python is slow. Many of the math modules are written in c or c++, so they tend to be only slightly slower. I write my latency critical code in c++ and then use a pybind11...

Amp offers Rithmic API, which is very self contained and easy to work with. To my knowledge you MUST purchase data though. Who are you using for data?

Should actually be relatively easy to show it wasn't one big order (if thats the case). I have micro-second timestamped quote/trade/book data.... I'll dig into it once I get some time, and post back here. Most likely it was a big sell order that triggered an avalanche of stops.

Nope, sorry. I don't even trade equities, outside of my retirement accounts. Do share if you find a suitable replacement though.

To my knowledge Rithmic only does futures, not equites.

I'm using Rithmic API+, and I actually find it to be a superior product for MUCH cheaper. It doesn't have the built in databasing NxCore had...but if you can use RAPI, you can likely figure out how to create a database (I use sqlite)

Sad to hear, I enjoyed the product, for the most part. Customer support was pretty good too. I did notice their API wasnt as flexible as it should have been, and updates were slow..maybe that's why they met their demise?

Roger that, the 10k calls out what those costs are, and you're correct profit was like $158M. But they also paid close to $100M in employee wages. Probably another $50M in benefits packages, etc.... From a pure trading perspective ( i.e trading minus fees, data, hosting)...are they really...

According to virtu's 10K docs, they generated about $670M in trading revenue last year. Does anyone know what kind of trading capital they had to have to generate that? I'm curious how they would have faired vs the buffet index bet....

Thank you! I can't even begin to explain how pleased I am with your product and the support team.

Copy on all, and thanks for the insights. Fees and commissions are absolutely part of optimization process, but aren't something I try to minimize (from buy/sell strategy standpoint, obviously I seek the cheapest fcm that matches my needs). In my "production" strategy, I optimize for a...

That functionality appears to be implement in the rtrader software the resides on your computer, not the server. Rtrader is presumably built on top of the same RAPI, and the API docs don't indicate such capabilities

I think we ought to give IB a little more credit. They know exactly which accounts are driving their revenue, and which accounts are only adding risk. I'm certain this move was calculated.