Inogen Inc. is a healthcare company based in the United States that specializes in developing and manufacturing portable oxygen concentrators for patients with chronic respiratory conditions. The company's flagship product, the Inogen One system, offers a lightweight and convenient alternative to traditional oxygen therapy methods. Inogen sells its products to home medical equipment providers and also offers direct rentals to patients. The company has a medium risk assessment with an ESG score of 22.4, and it generates most of its revenue in the United States. Through partnerships with distributors, large gas companies, and home oxygen providers, Inogen expands its reach internationally.