ATCO (ACO-X) AGM 2025 summary

Opening remarks and agenda

• Meeting held virtually, enabling global participation and voting for Class II share owners and proxy holders.

• Senior management, directors, and employees attended via webcast; agenda focused on formal business as described in the Notice of Meeting.

• Only questions directly related to the motion were to be addressed during the meeting.

Corporate governance

• Meeting called to order with Chair and Secretary appointed per bylaws; scrutineers from TSX Trust Company designated.

• Notice and proxy materials sent to all relevant parties in compliance with legal requirements and court order.

• Quorum established with 96.5% of Class II Voting Shares represented.

Overview of voting outcomes

• Each Class II Voting Share as of record date entitled to one vote; proxies submitted prior to meeting remained valid.

• Voting conducted online, with polls open until conclusion of formal business; only Class II share owners and proxies could vote.

• Arrangement Resolution required approval by at least 66 2/3% of votes cast and a simple majority excluding certain shareholders.

• Motion to approve the Arrangement Resolution was moved, seconded, and passed, meeting all required thresholds.

• Final voting report to be filed on SEDAR+ and included in meeting minutes.