Cenovus Energy Inc. has agreed to acquire all issued and outstanding common shares of Athabasca Oil Corporation (TSX: ATH) under a definitive arrangement agreement announced October 5, 2026. The deal will proceed by plan of arrangement under the Business Corporations Act (Alberta). Athabasca shareholders will receive $12.00 per share. They may elect cash, 0.264 of a Cenovus share, or a combination, subject to pro-ration. Aggregate cash is capped at $4.3 billion (75 percent of total consideration) and Cenovus shares at 44.4 million (35 percent), so consideration will be 65 to 75 percent cash. Cenovus reports an implied enterprise value of $5.7 billion, and Athabasca reports an implied equity value of about $5.8 billion. The deal adds about 45,000 barrels of oil equivalent per day, including thermal oil sands assets at Leismer and Corner. It also consolidates ownership of Duvernay Energy Corporation, in which Athabasca holds a 70 percent equity interest. The transaction is ongoing. It requires Athabasca shareholder approval at a special meeting expected in late November 2026, approval of the Court of King's Bench of Alberta, and regulatory and stock exchange approvals, including under the Competition Act (Canada). Closing is expected in December 2026. McCarthy Tétrault LLP is legal adviser to Cenovus. Norton Rose Fulbright Canada LLP is legal counsel to Athabasca, and Bennett Jones LLP is independent legal counsel to Athabasca's special committee. CIBC Capital Markets, Peters & Co. Limited and National Bank of Canada Capital Markets act as financial advisers.