Cornerstone Building Brands Inc.

Cornerstone Building Brands is a leading manufacturer of exterior building products for residential and low-rise non-residential buildings in North America. Headquartered in Cary, N.C., we serve residential and commercial customers across the new construction and Repair & Remodel (R&R) markets. Our market-leading portfolio of products spans vinyl windows, vinyl siding, metal roofing, metal wall systems and metal accessories. Cornerstone Building Brands’ broad, multi-channel distribution platform and expansive national footprint includes approximately 19,400 team members at manufacturing, distribution and office locations throughout North America. Corporate stewardship is embedded in our culture and guides our commitment to responsible growth, environmental care and community impact. For more information, visit us at cornerstonebuildingbrands.com.

1. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory ArrangementsNov 4, 2026
2. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory ArrangementsOct 22, 2026
3. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements · Other EventsSep 9, 2026
4. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements · Submission of Matters to a Vote of Security HoldersAug 28, 2026
5. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements · Submission of Matters to a Vote of Security HoldersJun 2, 2026