Dec 18 (Reuters) - Global law firm Hogan Lovells and New York-based Cadwalader, Wickersham & Taft have agreed to merge, the firms said on Thursday, creating a mega-firm with 3,100 lawyers and a combined $3.6 billion in annual revenue. 

The combined firm will be named Hogan Lovells Cadwalader and will unite Hogan Lovells' international clientele with those of Wall Street's oldest law firm, the firms said. The proposed merger is subject to a partnership vote, set to be held in 2026.