# EDGAR Filing Document

**Accession Number:** 0001294133
**File Stem:** 0001294133-26-000023
**Filing Date:** 2026-6
**Character Count:** 20966
**Document Hash:** e9cdf14425ca420617ba0b2ab95f401b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001294133-26-000023.hdr.sgml**: 20260622

**ACCESSION NUMBER**: 0001294133-26-000023

**CONFORMED SUBMISSION TYPE**: S-8

**PUBLIC DOCUMENT COUNT**: 14

**FILED AS OF DATE**: 20260612

**DATE AS OF CHANGE**: 20260612

**EFFECTIVENESS DATE**: 20260612

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Inogen Inc
- **CENTRAL INDEX KEY:** 0001294133
- **STANDARD INDUSTRIAL CLASSIFICATION:** ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES [3842]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** S-8
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-296742
- **FILM NUMBER:** 261086679

**BUSINESS ADDRESS:**
- **STREET 1:** 500 CUMMINGS CENTER
- **STREET 2:** SUITE 2800
- **CITY:** BEVERLY
- **STATE:** MA
- **ZIP:** 01915
- **BUSINESS PHONE:** 805-562-0500

**MAIL ADDRESS:**
- **STREET 1:** 500 CUMMINGS CENTER
- **STREET 2:** SUITE 2800
- **CITY:** BEVERLY
- **STATE:** MA
- **ZIP:** 01915

**As filed with the Securities and Exchange Commission on June 12, 2026**

**Registration Statement No. 333-**

------

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM S-8**

**REGISTRATION STATEMENT**

***Under***

***THE SECURITIES ACT OF 1933***

**Inogen, Inc.**

**(Exact name of registrant as specified in its charter)**

---

| | |
|:---|:---|
| **Delaware** | **33-0989359** |
| **(State or other jurisdiction of**<br>**incorporation or organization)** | **(I.R.S. Employer**<br>**Identification No.)** |

---

**500 Cummings Center, Suite 2800**

**Beverly, Massachusetts 01915**

**(Address of principal executive offices)**

**Inogen, Inc. Amended and Restated 2023 Equity Incentive Plan**

**(Full title of the plan)**

**Kevin R.M. Smith**

**Chief Executive Officer and President**

**Inogen, Inc.**

**500 Cummings Center, Suite 2800**

**Beverly, Massachusetts 01915**

**(Name and address of agent for service)**

**(805) 562-0500**

**(Telephone number, including area code, of agent for service)**

*Copies to:*

---

| | |
|:---|:---|
| **<br>Sarah C. Griffiths<br>Covington & Burling LLP<br>One International Place, Suite 1020<br>Boston, MA 02110<br>Telephone: (617) 603-8800** | **Kevin P. Smith<br>General Counsel<br>Inogen, Inc.<br>500 Cummings Center, Suite 2800**<br>**Beverly, Massachusetts 01915**<br>**Telephone: (877) 466-4364** |

---

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

---

| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ☐ | Accelerated filer | ☒ |
| Non-accelerated filer | ☐ | Smaller reporting company | ☒ |
|  |  | 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 7(a)(2)(B) of the Securities Act. ☐

------

**<u>EXPLANATORY NOTE</u>**

This Registration Statement on Form S-8 (the "**Registration Statement**") of Inogen, Inc. (the "**Company**" or the "**Registrant**") registers an additional 750,000 shares of common stock of the Registrant, par value $0.001 per share ("**Common Stock**"), reserved for issuance pursuant to future awards under the Registrant's Amended and Restated 2023 Equity Incentive Plan (the "**2023 Plan**"). This share increase was approved by the Company's stockholders at an annual meeting of stockholders held on June 5, 2026. In accordance with Section E of the General Instructions to Form S-8, the contents of the previous registration statements on Form S-8 filed by the Registrant with the Securities and Exchange Commission (the "**Commission**") on June 7, 2023 (File No. 333-272468), June 12, 2024 (File No. 333-280151), and May 20, 2025 (File No. 333-287433) are incorporated by reference herein, except to the extent supplemented, superseded or modified by the specific information set forth below or the specific exhibits attached hereto. In accordance with the instructional note to Part I of Form S-8 as promulgated by the Commission, the information specified by Part I of Form S-8 has been omitted from this Registration Statement.

**PART II**

**INFORMATION REQUIRED IN REGISTRATION STATEMENT**

**Item 3. Incorporation of Documents by Reference.**

The Registrant is subject to the informational and reporting requirements of Sections 13(a), 14 and 15(d) of the Securities Exchange Act of 1934, as amended (the "**Exchange Act**") and in accordance therewith files reports, proxy statements and other information with the Commission. The Registrant hereby incorporates by reference into this Registration Statement the following documents previously filed with the Commission:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)The Registrant's Annual Report on [<u>For</u><u>m 10-K</u>](https://www.sec.gov/Archives/edgar/data/1294133/000095017025029993/ingn-20241231.htm) for the fiscal year ended December 31, 2025, filed with the Commission on February 27, 2026.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)The Registrant's Quarterly Report on [<u>Form 10-Q</u>](https://www.sec.gov/Archives/edgar/data/1294133/000095017025066966/ingn-20250331.htm)for the period ended March 31, 2026, filed with the Commission on May 8, 2026.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)The Registrant's Current Reports on Form 8-K filed on [<u>March 30, 2026</u>](https://www.sec.gov/Archives/edgar/data/1294133/000119312526131855/ingn-20260324.htm), [<u>April 6, 2026</u>](https://www.sec.gov/ix?doc=/Archives/edgar/data/0001294133/000119312526143703/ingn-20260406.htm), and [<u>June 11, 2026</u>](https://www.sec.gov/ix?doc=/Archives/edgar/data/0001294133/000129413326000021/ingn-20260605.htm) (other than information furnished rather than filed in any such report).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)All other reports filed with the Commission pursuant to Section 13(a) or 15(d) of the Exchange Act since the end of the fiscal year covered by the Registrant's Annual Report referred to in (1) above (other than information furnished rather than filed in any such report).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(5)The description of the Registrant's common stock contained in the Company's Registration Statement on [<u>Form 8-A</u>](https://www.sec.gov/Archives/edgar/data/1294133/000119312514042887/d673671d8a12b.htm) (File No. 001-36309) filed with the Commission on February 10, 2014, pursuant to Section 12(b) of the Exchange Act, including any amendment or report filed for the purpose of updating such description.

All documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act on or after the date of this Registration Statement and prior to the filing of a post-effective amendment to this Registration Statement that indicates that all securities offered have been sold or that deregisters all securities then remaining unsold shall be deemed to be incorporated by reference in this Registration Statement and to be part hereof from the date of filing of such documents; *provided*, *however*, that documents or information deemed to have been furnished and not filed in accordance with the rules of the Commission shall not be deemed incorporated by reference into this Registration Statement. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document which also is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

------

**Item 8. Exhibits.**

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  |  | &nbsp;&nbsp;**Incorporated by Reference** | &nbsp;&nbsp;**Incorporated by Reference** | &nbsp;&nbsp;**Incorporated by Reference** | &nbsp;&nbsp;**Incorporated by Reference** |
| &nbsp;&nbsp;**Exhibit<br>Number** | &nbsp;&nbsp;**Description** | &nbsp;&nbsp;**Form** | &nbsp;&nbsp;**File No.** | &nbsp;&nbsp;**Exhibit** | &nbsp;&nbsp;**Filing Date** |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.1 | &nbsp;&nbsp;[<u>Specimen common stock certificate of Registrant</u>](https://www.sec.gov/Archives/edgar/data/1294133/000119312514012574/d597508dex41.htm). | &nbsp;&nbsp;S-1/A | &nbsp;&nbsp;333-192605 | &nbsp;&nbsp;4.1 | &nbsp;&nbsp;1/16/14 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.2+ | &nbsp;&nbsp;[<u>Amended and Restated 2023 Equity Incentive Plan</u>](https://www.sec.gov/Archives/edgar/data/1294133/000095017024070900/ingn-ex10_1.htm). | &nbsp;&nbsp;8-K | &nbsp;&nbsp;001-36309 | &nbsp;&nbsp;10.1 | &nbsp;&nbsp;6/11/26 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.3+ | &nbsp;&nbsp;[<u>Form of Stock Option Agreement under the Amended and Restated 2023 Equity Incentive Plan.</u>](https://www.sec.gov/Archives/edgar/data/1294133/000095017024070900/ingn-ex10_2.htm) | &nbsp;&nbsp;8-K<br>| &nbsp;&nbsp;001-36309 | &nbsp;&nbsp;10.2 | &nbsp;&nbsp;6/11/26<br>|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.4+ | &nbsp;&nbsp;[<u>Form of Restricted Stock Unit Agreement - Time-Based under the Amended and Restated 2023 Equity Incentive Plan</u>](https://www.sec.gov/Archives/edgar/data/1294133/000095017024070900/ingn-ex10_3.htm). | &nbsp;&nbsp;8-K<br>| &nbsp;&nbsp;001-36309 | &nbsp;&nbsp;10.3 | &nbsp;&nbsp;6/11/26<br>|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.5+ | &nbsp;&nbsp;[<u>Form of Restricted Stock Unit Agreement - Performance-Based under the Amended and Restated 2023 Equity Incentive Plan</u>](https://www.sec.gov/Archives/edgar/data/1294133/000095017024070900/ingn-ex10_4.htm). | &nbsp;&nbsp;8-K<br>| &nbsp;&nbsp;001-36309 | &nbsp;&nbsp;10.4 | &nbsp;&nbsp;6/11/26<br>|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.1\* | &nbsp;&nbsp;[<u>Opinion of Covington & Burling LLP</u>](ingn-ex5_1.htm). |  |  |  |  |
| &nbsp;&nbsp;23.1\* | &nbsp;&nbsp;[<u>Consent of Deloitte and Touche LLP, Independent Registered Public Accounting Firm</u>](ingn-ex23_1.htm). |  |  |  |  |
| &nbsp;&nbsp;23.2\* | &nbsp;&nbsp;[<u>Consent of Covington & Burling LLP (contained in Exhibit 5.1 hereto)</u>](ingn-ex5_1.htm). |  |  |  |  |
| &nbsp;&nbsp;24.1\* | &nbsp;&nbsp;[<u>Power of Attorney (contained on signature page hereto)</u>](#poa). |  |  |  |  |
| &nbsp;&nbsp;107\* | &nbsp;&nbsp;[<u>Filing Fee Table</u>](ingn_exfilingfees.htm). |  |  |  |  |

---

+ Indicates management contract or compensatory plan, contract or arrangement.

\* Filed herewith.

------

**SIGNATURES**

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Beverly, Commonwealth of Massachusetts, on June 12, 2026.

---

| | |
|:---|:---|
| **INOGEN, INC.** | **INOGEN, INC.** |
| By: | /s/ Kevin R.M. Smith |
|  | Kevin R.M. Smith |
|  | *Chief Executive Officer, President and Director*<br>*(Principal Executive Officer)* |

---

**POWER OF ATTORNEY**

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Kevin R.M. Smith and Jason Richardson, and each of them, as his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities (including his or her capacity as a director and/or officer of Inogen, Inc.) to sign the Registration Statement on Form S-8 of Inogen, Inc., and any and all amendments (including post-effective amendments) thereto, and to file the same, with all exhibits thereto and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully for all intents and purposes as they, he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or their, his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Signature** | &nbsp;&nbsp;**Title** | &nbsp;&nbsp;**Date** |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Kevin R.M. Smith | &nbsp;&nbsp;Chief Executive Officer, President and Director (Principal Executive Officer) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Kevin R.M. Smith | &nbsp;&nbsp;Chief Executive Officer, President and Director (Principal Executive Officer) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Jason Richardson | &nbsp;&nbsp;Chief Financial Officer (Principal Accounting and Financial Officer) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Jason Richardson | &nbsp;&nbsp;Chief Financial Officer (Principal Accounting and Financial Officer) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Elizabeth Mora | &nbsp;&nbsp;Chairperson of the Board | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Elizabeth Mora | &nbsp;&nbsp;Chairperson of the Board | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Glenn Boehnlein | &nbsp;&nbsp;Director | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Glenn Boehnlein |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Mary Katherine Ladone | &nbsp;&nbsp;Director | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Mary Katherine Ladone |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Kevin King | &nbsp;&nbsp;Director | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Kevin King |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Heather Rider | &nbsp;&nbsp;Director | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Heather Rider |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Mira Sahney | &nbsp;&nbsp;Director | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Mira Sahney |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Vafa Jamali | &nbsp;&nbsp;Director | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 12, 2026 |
| &nbsp;&nbsp;Vafa Jamali |  |  |

---

------

## Exhibit 5.1

**Exhibit 5.1**

![img218640710_0.jpg](img218640710_0.jpg)

June 12, 2026

Inogen, Inc.<br>500 Cummings Center, Suite 2800<br>Beverly, Massachusetts 01915

Ladies and Gentlemen:

We have acted as counsel to Inogen, Inc., a Delaware corporation (the "Company"), and are rendering this opinion in connection with the registration by the Company under the Securities Act of 1933 (the "Act"), of the offer and sale of 750,000 shares of the Company's common stock, par value $0.001 per share (the "Shares") issuable under the Company's Amended and Restated 2023 Equity Incentive Plan (the "Plan"), pursuant to the registration statement on Form S-8 being filed with the United States Securities and Exchange Commission on the date hereof (the "Registration Statement").

We have reviewed the Registration Statement and such corporate records, certificates and other documents, and such questions of law, as we have deemed necessary or appropriate for the purposes of this opinion. We have assumed that all signatures are genuine, that all documents submitted to us as originals are authentic and that all copies of documents submitted to us conform to the originals.

We have assumed that the Shares will be duly registered on the books of the transfer agent and registrar of the Common Stock and that the Company will comply with applicable notice requirements regarding uncertificated shares provided under the Delaware General Corporation Law (the "DGCL").

We have assumed further that, except as to legal conclusions expressly set forth in this opinion, the information and representations and warranties contained in the agreements, instruments, records, certificates and other documents we reviewed were true, accurate and complete as of their stated date and are true, accurate and complete as of the date of this letter.

We have relied as to certain matters on information obtained from public officials, officers of the Company and other sources believed by us to be responsible.

Based upon the foregoing, we are of the opinion that the Shares have been duly authorized and, when issued and paid for in accordance with the terms of the Company's Thirteenth Amended and Restated Certificate of Incorporation, the Plan and any individual agreements relating to such Shares, will be validly issued, fully paid and nonassessable.

We are members of the bar of the Commonwealth of Massachusetts. We do not express any opinion herein on any laws other than the General Corporation Law of the State of Delaware.

------

We hereby consent to the filing of this opinion as Exhibit 5.1 to the Registration Statement. In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act.

Very truly yours,

/s/ Covington & Burling LLP

------

## Exhibit 23.1

**Exhibit 23.1**

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated February 27, 2026, relating to the financial statements of Inogen, Inc. and the effectiveness of Inogen, Inc.'s internal control over financial reporting, appearing in the Annual Report on Form 10-K of Inogen, Inc. for the year ended December 31, 2025.

*/s/ Deloitte & Touche LLP* 

Los Angeles, California<br>June 12, 2026

------

## Ex-Filing

?xml version='1.0' encoding='ASCII'? EX-FILING FEES

**Exhibit 107** 

**Calculation of** Filing Fee **Tables** 

**Form** S-8

(Form Type)

Inogen, Inc.

(Exact name of registrant as specified in its charter)

**Table 1 – Newly Registered Securities** 

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| Security Type | **Security Class**<br>**Title** | **Fee**<br>**Calculation**<br>**Rule** | **Amount<br>Registered**<sup>(1)</sup> | **Maximum<br>Aggregate<br>Offering**<br>**Price** | **Fee**<br>**Rate** | **Amount of<br>Registration<br>Fee** |
| Equity | Common Stock, par value $0.001 per share | Rule 457(c) and Rule 457(h) | 750000<sup>(2)</sup><br>$6.28<sup>(3)</sup> | $4710000 | 0.0001381 | $650.46 |
| **Total Offering Amounts** | **Total Offering Amounts** | **Total Offering Amounts** | 750000 | $4710000 |  | $650.46 |
| **Total Fee Offsets**<sup>(4)</sup> | **Total Fee Offsets**<sup>(4)</sup> | **Total Fee Offsets**<sup>(4)</sup> | **Total Fee Offsets**<sup>(4)</sup> |  |  | —  |
| **Net Fee Due** | **Net Fee Due** | **Net Fee Due** | **Net Fee Due** |  |  | $650.46 |

---

(1) Pursuant to Rule 416 under the Securities Act of 1933, as amended (the "Securities Act"), this Registration Statement on Form S-8 (the "Registration Statement") also covers any additional shares of Inogen, Inc.'s (the "Registrant") common stock, par value $0.001 per share ("Common Stock"), that may become issuable under the Inogen, Inc. Amended and Restated 2023 Equity Incentive Plan (the "2023 Plan") to prevent dilution in the event of a reorganization, reclassification, stock split, dividend or distribution, or other similar transaction.

(2) Represents an increase of 750,000 shares of Common Stock available for grant under the 2023 Plan.

(3) Pursuant to Rule 457(c) and 457(h) under the Securities Act, and solely for the purpose of calculating the registration fee, the proposed maximum offering price per share is $6.28, which is the average of the high and low prices of shares of Common Stock on The Nasdaq Global Select Market on June 8, 2026 (such date being within five business days of the date on which this Registration Statement was filed with the U.S. Securities and Exchange Commission).

(4) The Registrant does not have any fee offsets.

------