SCHEDULE 13D

Sabre Corp

Common Stock, $0.01 par value · CUSIP: 78573M104

Event date: 2026-02-26

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• CONSTELLATION SOFTWARE INCReported CIK 0001113678

  Shares: 50,157,523.00 · Class: 12.7%

• CONSTELLATION CANADIAN HOLDINGS INC.

  Shares: 50,157,523.00 · Class: 12.7%

• MARK MILLER

  Shares: 50,157,523.00 · Class: 12.7%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.