Company: UIS
Filing Date: 2025-03-24
Form Type: DEFA14A
Source: 0001104659-25-027316
Chunk: 0

Company: UNISYS CORP
Filing Date: 2025-03-24
Form: DEFA14A
Chunk 0
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<div align='center'>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. )</div>

| x   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 |

| x | Definitive Additional Materials |

| ¨ | Soliciting Material Pursuant to §240.14a-12 |

<div align='center'>Unisys Corporation

(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement,
if other than the Registrant)</div>

PAYMENT OF FILING FEE (CHECK ALL BOXES THAT APPLY):

| x | No fee required |

| ¨ | Fees paid previously with preliminary materials |

| ¨ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

| Your Vote Counts!                                                                                                                    
 *Please check the meeting materials for any special requirements for meeting attendance.                                             
 Smartphone users                                                                                                                     
 Point your camera here and                                                                                                           
 vote without entering a                                                                                                              
 control number                                                                                                                       
 For complete information and to vote, visit www.ProxyVote.com                                                                        
 Control #                                                                                                                            
 V65313-P23187-Z89176                                                                                                                 
 UNISYS CORPORATION                                                                                                                   
 801 LAKEVIEW DRIVE, SUITE 100                                                                                                        
 BLUE BELL, PA 19422                                                                                                                  
 UNISYS CORPORATION                                                                                                                   
 2025 Annual Meeting                                                                                                                  
 Vote by May 7, 2025                                                                                                                  
 11:59 PM ET                                                                                                                          
 You invested in UNISYS CORPORATION and it’s time to vote!                                                                            
 You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the             
 availability of proxy materials for the stockholder meeting to be held on May 8, 2025.                                               
 Vote Virtually at the Meeting*                                                                                                       
 May 8, 2025