UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 12, 2026 INOGEN, INC. (Exact name of Registrant as Specified in Its Charter) (State or Other Jurisdiction of Incorporation) Delaware 001-36309 33-0989359 (Commission File Number) (IRS Employer Identification No.) 859 Ward Drive Goleta, California 93111 (Address of Principal Executive Of ...