Company: INGN
Filing Date: 2025-05-20
Form Type: S-8
Source: 0000950170-25-075217
Chunk: 0

Company: Inogen Inc
Filing Date: 2025-05-20
Form: S-8
Chunk 0
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As filed with the Securities and Exchange Commission on May 20, 2025 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 ofincorporation or organization) | -I.R.S. EmployerIdentification No. |

859 Ward Drive Goleta, California 93111 (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. 859 Ward Drive Goleta, California 93111 (Name and address of agent for service) (805) 562-0500 (Telephone number, including area code, of agent for service) Copies to:

| Sarah C. Griffiths                  
 Covington & Burling LLP             
 One International Place, Suite 1020 
 Boston, MA 02110                    
 Telephone: (617) 603-8800           | Kevin P. Smith            
 General Counsel           
 Inogen, Inc.              
 859 Ward Drive            
 Goleta, California 93111  
 Telephone: (805) 562-0500 |

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. ☐

### EXPLANATORY NOTE
This Registration Statement on Form S-8