Company: STAA
Filing Date: 2025-10-20
Form Type: DEFA14A
Source: 0001193125-25-243044
Chunk: 1

Company: STAAR SURGICAL CO
Filing Date: 2025-10-20
Form: DEFA14A
Chunk 1
---
� | 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              |     | STAA      |     | NASDAQ                |

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 financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

| Item 2.02 | Results of Operations and Financial Condition. |

On October 20, 2025, STAAR Surgical Company (the “Company”) published a press release reporting its preliminary net sales results for the quarter ended September 26, 2025, a copy of which is filed as Exhibit 99.1 to this report and is incorporated herein by this reference.

| Item 9.01 | Financial Statements and Exhibits. |

| Exhibit 
 Number  
 99.1    |     | Exhibit                                                                     
 Press release of the Company dated October 20, 2025.                        |
|:--------|:----|:----------------------------------------------------------------------------|
| 104     |     | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

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

| Date: October 20,