Selling your business, buying a Midwest target, structuring a PE-backed roll-up, or running a strategic carve-out in Chicago? Chicago is the dominant M&A market in the central United States — home to Kirkland & Ellis (the global #1 M&A firm by deal count), Sidley Austin, Mayer Brown, and a deep middle-market bench. The firms below structure middle-market through mega-cap deals every week.
Updated April 28, 2026
Chicago founders, boards, and PE sponsors retain M&A counsel for four recurring reasons: a strategic acquirer has signed an LOI to buy the company; a PE platform has identified a Midwest target for add-on acquisition; the company is raising late-stage capital that resembles a partial sale; or a corporate carve-out is being structured for spin or sale. Chicago's PE ecosystem is dense — GTCR, Madison Dearborn, Thoma Bravo, Vista Equity, Wind Point, Linden, MSouth, and many others run platforms out of the city.
Chicago's M&A market is anchored at the top tier by Kirkland & Ellis, which has led the global league tables in M&A deal count for years and dominates private equity transactional work worldwide. Sidley Austin, Mayer Brown, Winston & Strawn, Skadden, McDermott Will & Emery, Jenner & Block, and Latham & Watkins all have substantial Chicago M&A teams. The middle market and lower middle market run efficiently at Barack Ferrazzano Kirschbaum & Nagelberg, Much Shelist, Neal Gerber & Eisenberg, and similar Chicago middle-market firms.
By sector: financial services, healthcare, manufacturing, food and consumer products, and logistics dominate Chicago M&A. Each has industry-specific deal points — healthcare deals carry Stark, Anti-Kickback, and licensure transfers; manufacturing deals carry environmental, pension (especially multiemployer withdrawal liability), and union successorship; consumer products deals carry FDA, customs, and IP. Chicago M&A counsel typically have sector experience that informs deal structure.
Critical early decisions in any Chicago deal: stock vs asset structure; cash vs stock vs hybrid consideration with rollover equity; reps and warranties insurance vs traditional indemnity (now standard in middle-market PE); HSR antitrust filing; CFIUS review for any foreign acquirer; multiemployer pension withdrawal liability analysis for any deal involving union workforces; and 280G analysis for executive payouts. Engage Chicago M&A counsel at the LOI stage — economic structure is hardest to change after the term sheet.
Chicago-headquartered global firm. Consistently #1 globally by M&A deal count for years. Dominant private equity practice serving most major sponsors. Standard for large-cap PE-backed deals, public-company M&A, and complex carve-outs. Headline matters include the $90B Celgene and $63B Allergan transactions.
Chicago-headquartered global firm. Acclaimed corporate practice across PE, public-company M&A, and cross-border transactions. Particular strength in insurance, financial services, healthcare, automotive, and technology sectors. Frequent counsel to Fortune 100 acquirers and large strategics.
Chicago-headquartered global firm. Deep bench in domestic and cross-border transactions, particularly for global financial institutions, multinational corporates, and private investment funds. Strong supply-chain, automotive, and industrial M&A practice.
Chicago middle-market business firm. Strong M&A practice for middle-market and lower middle-market deals across banking, manufacturing, food and beverage, and professional services. Pragmatic economics for $25M-$300M transactions and a default choice for many Chicago-area founders.
Chicago middle-market firm. M&A practice serving privately held businesses across manufacturing, distribution, healthcare, and professional services. Lower middle-market sweet spot ($5M-$75M). Frequent counsel for family-business sales and management buyouts.
Lower middle market ($5M-$25M deals). Buy-side legal fees of $40,000-$170,000, sell-side $30,000-$135,000. Often handled at fixed or capped fees by Chicago middle-market firms.
Middle market ($25M-$250M deals). Buy-side $225,000-$825,000, sell-side $185,000-$650,000. Hourly billing standard with budget caps for known scope items. Barack Ferrazzano, Much Shelist, Neal Gerber, and similar firms are the typical economics here.
Large-cap ($250M-$1B deals). Buy-side $850,000-$3.0M, sell-side $700,000-$2.3M. Winston & Strawn, McDermott, Jenner & Block compete with the top tier here.
Mega-cap and public company ($1B+). Kirkland, Sidley, Mayer Brown, Skadden, Latham rates. $2.5M-$13M+ per side is normal. RWI broker fees and HSR filing fees additional.
Add-ons. Reps and warranties insurance premium: 2.5-4.5% of policy limits. HSR filing fee: $30,000-$280,000 depending on deal size. CFIUS filing fee: tiered, up to $300,000.
LOI signed: typically 3-5 weeks of pre-LOI negotiation.
Due diligence: 3-8 weeks in parallel with definitive agreement drafting. Quality-of-earnings, IP, employment (with pension diligence for union workforces), tax, environmental, and regulatory diligence run on parallel workstreams.
Definitive agreements drafted, negotiated, signed: 3-6 weeks from LOI for a clean middle-market deal. Longer for complex carve-outs, multi-jurisdictional deals, RWI-driven negotiations.
Regulatory clearance: HSR 30-day waiting period (with possible second request). Sector-specific approvals (banking, insurance, healthcare) extend timelines.
Closing to integration: closing usually 1-7 days after regulatory clearance. Most modern Chicago closings are remote signings.
Tell us briefly about the deal. We route a confidential request to the best-fit Chicago M&A firm in our directory.