An anonymous director reports

UPDATE ON SUNCOR ENERGY RESPONSE TO CYBERSECURITY INCIDENT

As previously announced on June 25, 2023, Suncor Energy Inc. experienced a cybersecurity incident. It immediately activated its business continuity plans, engaged leading information technology and cybersecurity experts, and notified relevant authorities. Based on its investigation to date, Suncor determined that its IT network was accessed by an unauthorized party on or about June 21, 2023.

The incident has not impacted the safety and reliability of the company's field operations. However, its Petro-Canada business experienced temporary disruptions that have largely been resolved. Suncor's focus throughout has been to protect its IT systems and minimize disruption to its customers and suppliers.

The company has determined that its Petro-Points program has been impacted. The unauthorized party obtained members' basic contact information. Suncor is notifying Petro-Points members and the appropriate privacy regulators.

If the company discovers additional information was obtained, it will notify affected parties as appropriate.

About Suncor Energy Inc.

Suncor is Canada's leading integrated energy company. Suncor's operations include oil sands development, production and upgrading; offshore oil and gas; petroleum refining in Canada and the United States; and the company's Petro-Canada retail and wholesale distribution networks (including Canada's Electric Highway, a coast-to-coast network of fast-charging electric vehicle stations). Suncor is developing petroleum resources while advancing the transition to a low-emissions future through investment in power, renewable fuels and hydrogen. Suncor also conducts energy trading activities focused principally on the marketing and trading of crude oil, natural gas, byproducts, refined products and power. Suncor has been recognized for its performance and transparent reporting on the Dow Jones Sustainability index, FTSE4Good and CDP. Suncor's common shares are listed on the Toronto Stock Exchange and the New York Stock Exchange.