Top 5 Consulting Firms in New York

New York's consulting market is the deepest and most competitive in the country, home to the global headquarters of the MBB firms, the Big Four, and a dense cluster of specialized boutiques built around finance, media, and private equity. For companies evaluating partners here, the challenge isn't a shortage of options — it's cutting through brand recognition to find the firm whose delivery model, not just its name, matches the mandate.

That distinction matters most for post-merger integration and operational transformation work, where the difference between a firm built for enterprise-scale, multi-year engagements and one built for the pace of a middle-market deal can determine whether a 100-day plan actually holds. Below are five firms active in the New York integration and transformation market.

• AlixPartners — Headquartered in New York, AlixPartners built its reputation on turnaround, restructuring, and operational performance improvement, bringing a practitioner model designed for high-stakes, urgent engagements — a strong fit for distressed or operationally complex deals.

• Alvarez & Marsal (A&M) — Known for hands-on interim-management and operational performance work, A&M carries substantial weight in restructuring and performance improvement, particularly where the CFO agenda and balance-sheet issues sit at the center of the engagement.

• FTI Consulting — Listed on the NYSE and founded in 1982, FTI operates across economic consulting, corporate finance and restructuring, and forensic and litigation consulting — especially strong where integration work intersects with regulatory, antitrust, or disputes exposure.

• Deloitte — Deloitte's New York-based M&A Integration practice operates at full transaction lifecycle scale, with particular strength in technology integration, ERP consolidation, and large, multi-workstream coordination across legal, finance, HR, and technology.

• Stonehill — For PE-backed platforms and founder-led companies that need senior, execution-focused integration leadership without Big Four scale or fees, Stonehill brings a boutique model built specifically for the middle market — deploying practitioners who have actually run integrations operationally, rather than staffing standard playbooks with junior teams.

New York's market has the depth to serve any transaction at any scale, but bigger isn't always better-suited: enterprise-scale firms bring process and global reach, while middle-market deals are frequently better served by a leaner, senior-staffed partner who treats a client's synergy targets as their own scorecard.