FPGAs are widely used in low latency trading. Most market data feed handlers and order passing adapters are done in FPGAs today - they offer better latency than software solutions and processing time is deterministic.

One example of a company offering something like that: https://www.enyx.com/

It highly depends on what you're doing, but in trading there is very often a direct reliationship between latency and how much money you can make.

He said because it allows for parallel processing, faster execution for realtime processing.

I suppose if you are literally only bound by processor speed it might help. But bringing it all together into a working system will take some effort. Had you considered offloading to GPUs instead?

What would you plug this FPGA into? Where will you trade? How much more will you make thanks to the FPGA's lower latency?