Company: STAA
Filing Date: 2025-08-05
Form Type: DEFA14A
Source: 0001193125-25-173098
Chunk: 0

Company: STAAR SURGICAL CO
Filing Date: 2025-08-05
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 4, 2025 STAAR Surgical Company (Exact name of registrant as specified in its charter)

| Delaware                                 |     | 0-11634     |     |             95-3797439 |
| (State or other jurisdiction             
 of incorporation)                        |     | -Commission 
 File Number |     |          -IRS Employer 
 Identification Number  |
| 25510 Commercentre Drive                 
 Lake Forest, California                  |     |             |     |                  92630 |
| (Address of principal executive offices) |     |             |     |              -Zip Code |

626-303-7902 (Registrant’s telephone number, including area code) Not Applicable (Former name or former address, if changed since last report) 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 (see General Instruction A.2. below):

| ☐ | 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