Knowles Corp. KN

What this company does

Knowles designs and manufactures high-performance capacitors, radio frequency (RF) filters, advanced microphones and balanced armature speakers for applications in the medtech, defense, industrial and electrification/energy markets. As of December 31, 2025, Knowles employed approximately 5,200 employees across facilities located in 11 countries around the world. Knowles has two reportable segments, Precision Devices and MedTech & Specialty Audio, aligned around similar product applications serving its key end markets. Its PD segment specializes in the custom design and delivery of high-performance capacitor products and RF solutions primarily serving the defense, industrial, medtech and electrification/energy markets, with manufacturing facilities in North America and Asia. Its MSA segment designs and manufactures balanced armature speakers and microphones used in hearing health and specialty audio applications serving the medtech and industrial markets, with manufacturing facilities in Asia. In 2025, its customers accounting for 10% or more of total revenues were WS Audiology A/S, a hearing aid manufacturer, and TTI, Inc., a distributor of electromechanical components. Knowles was founded in 1946 and is headquartered in Itasca, Illinois.

Written from the business description in Knowles Corporation's annual report to the U.S. Securities and Exchange Commission, filed 9 February 2026. Every sentence was checked against that document before publication.