Aearo Technologies LLC is a 3M-owned manufacturer of energy-control and protective products headquartered in Indianapolis, Indiana. Employing about 330 people, it develops proprietary materials that damp noise, vibration, shock, and thermal energy for OEMs and customers across aerospace, commercial vehicles, electronics, power generation, construction, agriculture, medical devices, and specialty vehicles. Aearo generated about $126 million in 2021 sales and also operates in Newark, Delaware.