More and more biotech firms are taking hearing loss seriously. Some of the names: Decibel Therapeutics (the focus of the article below), Auris Medical Holding, Autifony Therapeutics, Kyorin Pharmaceuticals, Merz Pharmaceuticals, Novartis, Otic Pharma Synphora, and Sound Pharmaceuticals:

I have found setting up Google Alerts for such companies helps to keep track of their progress.