Taft Stettinius & Hollister to Merge With Morris, Manning & Martin

Hogan Lovells and Cadwalader Combine to Create Hogan Lovells Cadwalader

December 18, 2025

Professional Services

Hogan Lovells and Cadwalader have been approved by partner vote to combine, creating a scaled global law firm branded as Hogan Lovells Cadwalader. The transaction is intended to strengthen finance, corporate, regulatory, IP, and disputes capabilities across major G20 markets, including the New York–London corridor.

Winston & Strawn and Taylor Wessing UK Combine to Form Winston Taylor

December 15, 2025

Professional Services

Winston & Strawn and Taylor Wessing UK announced and later completed a transatlantic law firm combination, launching under the unified name Winston Taylor. The combined firm brings together more than 1,400 lawyers across the United States, the United Kingdom, Europe, Latin America, and the Middle East, focused on major litigation, critical transactions, strategic IP, and private wealth.

McDermott Will & Emery and Schulte Roth & Zabel Merge to Form McDermott Will & Schulte

August 1, 2025

Professional Services

Leading international law firms McDermott Will & Emery and Schulte Roth & Zabel completed a merger effective August 1, launching the combined firm McDermott Will & Schulte. The combination creates a global legal platform with roughly 1,750+ attorneys across 20+ offices and expanded capabilities across healthcare, private capital, tax, litigation and regulatory services, with reported annual revenue of roughly $3 billion.

Plante Moran Acquires/Combines With Tonneson + Co

June 14, 2025

Accounting & Tax

Plante Moran announced that Boston-based accounting and advisory firm Tonneson + Co will join Plante Moran effective July 1, 2025. The combination expands Plante Moran’s East Coast presence and enhances capabilities for clients and staff while preserving Tonneson’s culture and relationships.

Baker Tilly and Moss Adams to Combine in Strategic Merger Backed by Hellman & Friedman

April 21, 2025

Accounting & Tax

Baker Tilly and Moss Adams announced a planned combination to create a larger advisory and accounting firm, expected to close in early June 2025. Hellman & Friedman will make an additional strategic investment post-close, with Valeas Capital Partners also increasing its investment.

Stantec Acquires Morrison Hershfield

January 9, 2024

Engineering Services

Stantec has signed an agreement to acquire Morrison Hershfield, a 1,150-person engineering and management firm headquartered in Markham, Ontario. The deal, structured as a court-approved plan of arrangement and subject to shareholder and regulatory approvals, expands Stantec's presence and capabilities across Canadian markets and strengthens its buildings, transportation, and environmental services offerings.