Actually, they&#x27;ve moved beyond that now.  The trend in high speed trading is towards FPGAs.  &quot;Java don&#x27;t play that.&quot; (not in any serious way).<p>Java in finance is actually slowly eroding overall.  Performance-critical logic is being moved into Python modules written in C.  &quot;That&#x27;s how <i>we</i> do it&quot; anyway.  The trouble is that Java code development is too slow and just getting your code deployed into a test environment is often ridiculously complicated (lots of middleware) whereas with Python &quot;you write, you run, you&#x27;re done.&quot;