8-K

UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON, 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)

Delaware	001-36309	33-0989359
(State or Other Jurisdiction<br>of Incorporation)	(Commission File Number)	(IRS Employer<br>Identification No.)
859 Ward Drive
Goleta, California		93111
(Address of Principal Executive Offices)		(Zip Code)
Registrant’s Telephone Number, Including Area Code: (805) 562-0500
---

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading<br>Symbol(s)	Name of each exchange on which registered
Common Stock, $0.001 par value	INGN	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 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 for a more complete understanding of the Company’s financial position and results of operations as of December 31, 2025. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report 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 incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

Exhibit	Description
99.1	Press Release, dated January 12, 2026
104	The cover page of this Current Report on Form 8-K, formatted in Inline XBRL

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

			INOGEN, INC.
Date:	January 12, 2026	By:	/s/ Michael Bourque
			Michael Bourque<br>Executive Vice President<br>Chief Financial Officer<br>Treasurer<br>(Principal Accounting and Financial Officer)

EX-99.1

Exhibit 99.1

Inogen Announces Preliminary Revenue Results for Fourth Quarter and Full-Year 2025

Inogen to Announce Fourth Quarter and Full Year 2025 Financial Results on February 24, 2026

GOLETA, Calif., January 12, 2026 -- Inogen, Inc.(Nasdaq: INGN), a medical technology company offering innovative respiratory products for use in the homecare setting, today announced preliminary, unaudited revenue results for the quarter and year ended December 31, 2025.

The Company estimates preliminary, unaudited total revenue in the fourth quarter of 2025 to be approximately $82 million, representing year-over-year growth of approximately 2%. Full year 2025 total preliminary, unaudited revenue is expected to be approximately $349 million, representing year-over-year growth of approximately 4%.

For the full year 2025, the Company expects to achieve positive Adjusted EBITDA, reflecting its continued commitment to financial discipline and effective cost management.

“While fourth quarter results continued to reflect strong performance in our business-to-business channels, we experienced a shift in the timing of a few large customer orders into the first half of 2026. While this delay relative to expectations is disappointing, our full year results continued to make meaningful progress in executing our business turnaround” said Kevin Smith, President and Chief Executive Officer. “Highlights for the full year include positive revenue growth, advancing toward profitability, and expanding the innovation pipeline with launches of the Voxi 5 stationary oxygen concentrator and Aurora Masks for Obstructive Sleep Apnea patients in the U.S. Our Inogen team remains confident in our ability to drive growth acceleration and profitability into 2026, and we look forward to sharing additional details and 2026 financial guidance during our February earnings call.”

Quarterly Conference Call Information

On February 24, 2026, the Company will host a conference call at 2:00 p.m. Pacific Time / 5:00 p.m. Eastern Time.

Individuals interested in listening to the conference call may do so by dialing:

US domestic callers (877) 841-3961 Non-US callers (201) 689-8589

Please reference Inogen to join the call. A live audio webcast and archived recording of the conference call will be available to all interested parties through the News / Events page on the Inogen Investor Relations website. This webcast will also be archived on the website for 6 months.

A replay of the call will be available approximately three hours after the live webcast ends and will be accessible through March 3, 2026. To access the replay, dial (877) 660-6853 or (201) 612-7415 and reference Conference ID: 13757405.

Inogen has used, and intends to continue to use, its Investor Relations website, http://investor.inogen.com/, as a means of disclosing material non-public information and for complying with its disclosure obligations under Regulation FD.

About Inogen

Inogen, Inc. (Nasdaq: INGN) is a leading global medical technology company offering innovative respiratory products for use in the homecare setting. Inogen supports patient respiratory care by developing, manufacturing, and marketing innovative best-in-class respiratory therapy devices used to deliver care to patients suffering from chronic respiratory conditions. Inogen partners with patients, prescribers, home medical equipment providers, and distributors to make its respiratory therapy products widely available, allowing patients the chance to manage the impact of their disease.

For more information, please visit www.inogen.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this communication that are not historical facts, including, but not limited to, statements regarding Inogen’s future business plans, market opportunities, financial outlook, growth strategies, and anticipated operational results, are forward-looking statements. Words such as “aims,” “believes,” “anticipates,” “plans,” “expectation,” “will,” “intends,” “potential,” “possible,” and similar expressions are intended to identify forward-looking statements. Forward-looking statements are subject to numerous risks and uncertainties that could cause actual results to differ materially from currently anticipated results, including but not limited to, risks and uncertainties relating to Inogen’s financial guidance; market acceptance of its products; competition; its sales, marketing and distribution capabilities; its planned sales, marketing, and research and development activities; and risks associated with international operations. Information on these and additional risks, uncertainties, and other information affecting Inogen’s business operating results are contained in its Annual Report on Form 10-K for the period ended December 31, 2024, and in its other filings with the Securities and Exchange Commission. These forward-looking statements speak only as of the date hereof. Inogen disclaims any obligation to update these forward-looking statements except as may be required by law.

Contact ir@inogen.net