Where is Deep Learning used in practice besides Google and Facebook ? • /r/MachineLearning

The problem with most SP500 companies is that they tend to hide their analytic procedures, regardless of the specifics. They consider these procedures their trade secrets, especially as the procedures are usually tightly engineered around data they have, again considered trade secret. You won't hear them claiming they do deep learning, just like you won't hear them claiming they do linear regression. Your best bet is looking at job offers, checking what requirements they put towards new hires… or certain industry-specific conferences.