Company: ICUI
Filing Date: 2025-08-08
Form Type: S-8
Source: 0001193125-25-176982
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Company: ICU MEDICAL INC/DE
Filing Date: 2025-08-08
Form: S-8
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As filed with the Securities and Exchange Commission on August 8, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ICU MEDICAL, INC. (Exact name of registrant as specified in its charter)

| Delaware                                 |     |         33-0022692 |
| (State or other jurisdiction of          
 incorporation or organization)           |     |   -I.R.S. Employer 
 Identification No. |
| 951 Calle Amanecer                       
 San Clemente, California                 |     |              92673 |
| (Address of Principal Executive Offices) |     |          -Zip Code |

Amended and Restated ICU Medical, Inc. 2011 Stock Incentive Plan (Full title of the Plan) Brian M. Bonnell Chief Financial Officer ICU Medical, Inc. 951 Calle Amanecer San Clemente, California 92673 (Name and address of agent for service) (949) 366-2183 (Telephone number, including area code, of agent for service) Copy to: Daniel E. Rees Latham & Watkins LLP 650 Town Center Drive, 20th Floor Costa Mesa, California 92626 (714) 540-1235 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a 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-2of 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(the “Registration Statement”) is filed by ICU Medical, Inc. (the “Company”)