Koss Corporation is an American company that designs and manufactures headphones. John C Koss founded the J.C. Koss Hospital Television Rental Company in 1953. After a short time Koss was looking for new ideas, and partnered with Martin Lange to eventually develop a stereo headphone. Based in Milwaukee, Wisconsin, USA, in 1991 Koss Audio & Video Electronics started producing and selling consumer electronics products as a separate company in Hazelwood, Missouri, USA. The Koss family owns more than 75% of the firm. Having only a high-school education, John C Koss worked with Lange, an... engineer, to develop the headphone that launched the company almost by accident, as they came upon the headphone idea as a result of an attempt to market a portable phonograph. Diversification into related electronics areas in the 1980s ended in disaster for Koss, who filed for bankruptcy protection after a net loss in 1984 of $6 million. Koss emerged from Chapter 11 bankruptcy proceedings in 1985. In 1991 Michael J Koss, son of founder John C Koss, took over as president and chief executive officer.
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| NASDAQ symbol: | KOSS |
| Headquarters: | Milwaukee, Wisconsin |
| Annual revenue: | $38,180,000 |
| Net income: | $1,980,000 |
| Operating income: | $2,610,000 |
| Market cap: | $65,000,000 |