Company: STAA
Filing Date: 2025-12-09
Form Type: DEFA14A
Source: 0001193125-25-311988
Chunk: 5

Company: STAAR SURGICAL CO
Filing Date: 2025-12-09
Form: DEFA14A
Chunk 5
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 outcome of any legal proceedings that may be instituted against the Company related to the proposed transaction; (8) the possibility that the Company’s stock price may decline significantly if
the proposed transaction is not consummated; and (9) other important factors set forth in the Proxy Statement under the caption “Risk Factors” and the Company’s Annual Report on Form
10-K for the year ended December 27, 2024 under the caption “Risk Factors,” as any such factors may be updated from time to time in the Company’s other filings with the SEC.

Forward-looking statements speak only as of the date they are made and, except as may be required under applicable law, the Company undertakes no obligation
to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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

| Date: December 9, 2025 |     | STAAR Surgical Company 
 By:                    |     | /s/ Stephen C. Farrell  |
|:-----------------------|:----|:-----------------------|:----|:------------------------|
|                        |     | Name:                  |     | Stephen C. Farrell      |
|                        |     | Title:                 |     | Chief Executive Officer |

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Exhibit 2.1

Execution Version

AMENDMENT NO. 2

TO

AGREEMENT AND PLAN OF MERGER

This Amendment No. 2, dated as of December 9, 2025 (this “”), to the Agreement and Plan of Merger, dated
as of August 4, 2025 (the “”), as amended, is by and among Alcon Research, LLC, a Delaware limited liability company (“”), Rascasse Merger Sub, Inc., a Delaware corporation and a
wholly owned direct subsidiary of Parent (“”), and STAAR Surgical Company, a Delaware corporation (the “”). Capitalized terms used and not defined in this Amendment shall have the meanings
ascribed to such terms in the Agreement (as defined below).

WHEREAS, on August 4, 2025, the parties entered into the Initial
Agreement, pursuant to which, among other things, and subject to the terms and conditions therein, Merger Sub will merge with and into the Company, with the Company surviving as a wholly