Other Events. The Board has determined to submit proposals to the Company’s stockholders at the Company’s 2027 Annual Meeting of Stockholders (the “2027 Annual Meeting”) to (a) amend the Company’s Thirteenth Amended and Restated Certificate of Incorporation (the “Charter”) to declassify the Board and provide for the annual election of all directors, and (b) amend the Charter and the Company’s Amended and Restated Bylaws to eliminate the supermajority voting requirements contained in those doc…

Results of Operations and Financial Condition. On November 5, 2026, the Company issued a press release reporting its financial results for the third quarter ended September 30, 2026, which also included an update regarding the completion of the Company’s previously announced sale of its U.S. rental business (the “Press Release”). A copy of the press release is furnished herewith as Exhibit 99.2 to this Current Report on Form 8-K. The information set forth under this Item 2.02, including Exhib…

CEO — Andrew P. Reding: The CEO transition involves the internal promotion of the COO to CEO, succeeding the outgoing CEO in an orderly manner.

Completion of Acquisition or Disposition of Assets. On November 2, 2026, Inogen, Inc. (“Inogen” or the “Company”) completed the previously announced sale of the United States oxygen rental business (the “Rental Business”) to Rotech Healthcare Inc. (“Rotech”), pursuant to the terms of the Asset Purchase Agreement, dated as of September 29, 2026 (the “Asset Purchase Agreement”). The assets transferred in the transaction consisted of specified on-rent and on-hand inventory and related patient re…

Regulation FD Disclosure. On September 30, 2026, the Company issued a press release announcing the execution of the Purchase Agreement and a separate product supply agreement with Rotech Healthcare Inc., together with the conditional amendment to the Company’s existing share repurchase program described in

Entry into a Material Definitive Agreement. On September 29, 2026, Inogen, Inc. (the “Company”) entered into an Asset Purchase Agreement (the “Purchase Agreement”) with Rotech Healthcare Inc. (the “Buyer”), pursuant to which the Company agreed to sell to the Buyer substantially all of the assets used or held for use solely in the operation of the Company’s United States oxygen rental business, including specified on-rent and on-hand inventory and related patient records (the “Transaction”). T…

Other Events On September 28, 2026, the Company’s Board of Directors approved an amendment to the Company’s existing share repurchase program. The Company's existing share repurchase program was originally authorized by the Board of Directors on February 20, 2026 and provides for the repurchase of up to $30.0 million of the Company’s common stock, exclusive of fees, commissions and other expenses, through December 31, 2027. The amendment is conditioned upon, and will become effective only upo…

Results of Operations and Financial Condition. On August 6, 2026, Inogen, Inc. (the “Company”) issued a press release reporting its financial results for the second quarter ended June 30, 2026. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K. The information set forth under this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), o…

Chief Operating Officer — Andrew (Andy) Reding: The company appointed a new Chief Operating Officer from an external candidate.

The filing pertains to the approval of an equity incentive plan and does not involve any changes in management or directors.

Results of Operations and Financial Condition. On May 7, 2026, Inogen, Inc. (the “Company”) issued a press release reporting its financial results for the first quarter ended March 31, 2026. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K. The information set forth under this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or i…

Entry into a Material Definitive Agreement. On April 6, 2026, the Board of Directors of (the “Board”) of Inogen, Inc. (the “Company”) appointed Mr. Vafa Jamali as a member of the Board as a Class I director, effective as of the earlier of (a) the date of the Company’s 2026 annual meeting of stockholders and (b) June 15, 2026 (such date, the “Effective Date”), with a term expiring at the Company’s 2027 annual meeting of stockholders or until his successor is duly elected and qualified. The Boa…

Class I director, Audit Committee member, Compliance Committee member — Vafa Jamali: Appointment of Vafa Jamali as a Class I director and committee member.

Chief Financial Officer — Jason Richardson: The company appointed a new Chief Financial Officer from an external candidate.

Regulation FD Disclosure. On February 20, 2026, the Board of Directors of the Company (the “Board”) approved the repurchase of up to an aggregate of $30 million of the Company's outstanding common stock, par value $0.001 per share (the “Repurchase Program”). Repurchases may be made from time to time on the open market at prevailing market prices, in compliance with Rule 10b-18 under the Exchange Act, including through Rule 10b5-1 trading plans. The Repurchase Program expires on the earlier of…

Results of Operations and Financial Condition. On February 24, 2026, Inogen, Inc. (the “Company”) issued a press release reporting its financial results for the fourth quarter and the full year ended December 31, 2025. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K. The information set forth under this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amende…

Results of Operations and Financial Condition. On January 12, 2026, Inogen, Inc. (the “Company”) issued a press release reporting preliminary, unaudited revenue results for the fourth quarter and full year ended December 31, 2025. The amounts included in the press release are preliminary, have not been audited and are subject to change upon completion of the Company’s audited financial statements for the year ended December 31, 2025. Additional information and disclosures would be required fo…

Results of Operations and Financial Condition. On November 5, 2025, Inogen, Inc. (the "Company") issued a press release reporting its financial results for the third quarter ended September 30, 2025. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K. The information set forth under this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Ac…

Results of Operations and Financial Condition. On August 7, 2025, Inogen, Inc. (the "Company") issued a press release reporting its financial results for the second quarter ended June 30, 2025. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K. The information set forth under this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), o…

Executive Officer and Section 16 Officer — Jennifer Yi Boyer: Ms. Jennifer Yi Boyer's role and responsibilities have expanded, designating her as an executive officer.

The filing pertains to the approval of an equity incentive plan and does not involve any changes in management or directors.

Results of Operations and Financial Condition. On May 7, 2025, Inogen, Inc. (the "Company") issued a press release reporting its financial results for the first quarter ended March 31, 2025. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K. The information set forth under this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or i…

Results of Operations and Financial Condition. On February 25, 2025, Inogen, Inc. (the "Company") issued a press release reporting its financial results for the fourth quarter and the full year ended December 31, 2024. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K. The information set forth under this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amende…

Director — Thomas A. West: Mr. West resigned from the Board and related committees, and Mira Kirti Sahney was appointed as a new Director.

Entry into a Material Definitive Agreement. Collaboration Agreement On January 25, 2025, Inogen, Inc., a Delaware corporation (the “Company” or “Inogen”), entered into a Strategic Collaboration Agreement (the “Collaboration Agreement”) with Jiangsu Yuyue Medical Equipment & Supply Co., Ltd. (“Yuwell”). The collaboration with Yuwell is expected to broaden Inogen's product portfolio through distribution of certain respiratory products in the United States and select other territories, expand an…