Company: STAA
Filing Date: 2025-12-08
Form Type: DEFA14A
Source: 0001193125-25-310637
Chunk: 1

Company: STAAR SURGICAL CO
Filing Date: 2025-12-08
Form: DEFA14A
Chunk 1
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 ☐ | 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 8.01. | Other Events. |

On December 8, 2025, STAAR Surgical Company (“STAAR”) issued a press release announcing the results of its “go-shop”process, which expired at 11:59 p.m., Eastern Time, on December 6, 2025, pursuant to the previously announced Amendment No. 1, dated November 7, 2025, to the Agreement and Plan of Merger, dated August 4, 2025, with Alcon Research, LLC and Rascasse Merger Sub, Inc. A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-Kand is incorporated herein by reference. Item 9.01. Financial Statements and Exhibits.

| Exhibit 
 No.     
 99.1    |     | Description of Exhibit                                                       
 Press Release, dated December 8, 2025                                        |
|:--------|:----|:-----------------------------------------------------------------------------|
| 104     |     | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

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