Company: SABR
Filing Date: 2025-04-03
Form Type: DEFA14A
Source: 0001193125-25-071877
Chunk: 0

Company: Sabre Corp
Filing Date: 2025-04-03
Form: DEFA14A
Chunk 0
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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 §240.14a-12                                           |

Sabre Corporation (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)(1) and 0-11 |

April 3, 2025 Dear Stockholders: We are asking for your critical support for the proposals to be voted on at Sabre’s 2025 Annual Meeting of Stockholders and to express our appreciation for your independent analysis in conducting your evaluation. Our Board of Directors continues to unanimously recommend you cast your vote FORall proposals. VOTE FOR PROPOSAL 3 – APPROVAL OF OUR 2025 OMNIBUS PLAN Specifically, we would like to draw your attention to Proposal 3, approval of the Sabre Corporation 2025 Omnibus Incentive Compensation Plan, which we refer to as our 2025 Omnibus Plan. Our 2025 Omnibus Plan:

| • |     | replaces our 2024 Omnibus Plan, increasing the number of shares authorized for issuance under our equity-based 
 compensation plans for our team members and other service providers;                                           |

| • |     | represents a critical part of our overall compensation program; |

| • |     | provides our team members and other service providers, who are responsible for the management, growth, and        
 direction of our business, with incentives and rewards to encourage them to continue in the service of Sabre; and |

| •