UNITED STATES
        
        SECURITIES AND EXCHANGE COMMISSION
        
        Washington, D.C. 20549
        SCHEDULE 14A
        Proxy Statement Pursuant to Section 14(a) of the
        
        Securities Exchange Act of 1934 (Amendment No. )
        | ☑ |  |  | Filed by the Registrant |  |  |  ☐ |  |  | Filed by a Party other than the Registrant | 
| Check the appropriate box; | |||
| ☐ |  |  | Preliminary Proxy Statement | 
| ☐ |  |  | Confidential, For Use of the Commission Only (as permitted by
                  Rule 14a-6(e)(2)) | 
| ☐ |  |  | Definitive Proxy Statement | 
| ☑ |  |  | Definitive Additional Materials | 
| ☐ |  |  | Soliciting Material Under Rule 14a-12 | 

Hologic, Inc.
        (Name of Registrant as Specified In Its Charter)
        
        (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)
        | Payment of Filing Fee (check all boxes that apply):  | ||||||
| ☑ |  |  | No fee required | |||
|  ☐ |  |  | Fee paid previously with preliminary materials | |||
|  ☐ |  |  | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules
                  14a-(6)(i) and 0-11 | |||

