The poor AI will be frustrated from the endless manipulations of the Bid/Ask prices by the MMs & Specialists... Hopefully the AI will "liberate" the markets from this criminal pest...
I know this is an old thread, but I thought I'd chime in and try to help you out. While I'm not sure about specific companies, there are definitely companies out there using AI for stock trading. One tool you might want to check out is Quantum AI.
Quantum AI is great. It's designed to understand stock quotes and make smart decisions. But hey, don't forget that AI is just a tool, and it's always good to combine it with good old-fashioned stock analysis.