Company: CELH
Filing Date: 2025-11-12
Form Type: 8-K/A
Source: 0001193125-25-278019
Chunk: 0

Company: Celsius Holdings, Inc.
Filing Date: 2025-11-12
Form: 8-K/A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 28, 2025 CELSIUS HOLDINGS, INC. (Exact name of registrant as specified in its charter)

| Nevada                       |     | 001-34611               |     | 20-2745790         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission File Number |     | -IRS Employer      
 Identification No. |

2381 NW Executive Center Drive, Boca Raton, Florida 33431 (Address of principal executive offices and zip code) (561) 276-2239 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-Kfiling 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   
 Symbol(s) |     | Name of Each Exchange on Which Registered |
| Common Stock, $0.001 par value per share |     | CELH      |     | Nasdaq Capital Market                     |

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-2of the Securities Exchange Act of 1934 (§240.12b-2of 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