Kirkland & Ellis
The world's largest law firm by revenue, with 4,000+ attorneys across 23 offices
333 West Wolf Point Plaza, Chicago, IL 60654
About
Kirkland & Ellis LLP is the largest law firm in the world by revenue, having become the first firm to reach $10 billion in annual revenue in 2025. Founded in Chicago in 1909, the firm has grown to more than 4,000 attorneys across 23 offices in the United States, Europe, and Asia. Kirkland's transactional practice covers private equity, mergers and acquisitions, and corporate finance at scale, with representative matters including Bristol-Myers Squibb's $90 billion acquisition of Celgene and AbbVie's $63 billion acquisition of Allergan. The firm's restructuring group is a market leader, and its litigation practice has represented clients including BP in the Deepwater Horizon proceedings, Volkswagen in the emissions matter, and Boeing in proceedings arising from the 737 MAX. The firm is led by Chairman Jon A. Ballis.
What this firm is known for
- Bristol-Myers Squibb's $90 billion acquisition of Celgene
- AbbVie's $63 billion acquisition of Allergan
- BP's defense in the Deepwater Horizon proceedings
- Volkswagen's defense in the emissions matter
- Boeing's defense in proceedings arising from the 737 MAX
Questions worth asking this firm
- What is your fee structure, and do you offer a contingency fee arrangement?
- Which attorneys in your firm would handle my matter day-to-day?
- Have you handled cases in Illinois state and federal courts?
- Tier:
- Distinguished
- Score:
- Reviews pending
- Founded:
- 1909
- Attorneys:
- 4,145
- Offices:
- 23
- Primary jurisdictions:
- Illinois, New York, California, Texas, Washington D.C., and international
- Languages:
- English
- Last reviewed:
- October 2026
Credentials & Recognitions
- Am Law 100
The American Lawyer (2026) — #1 by gross revenue - Vault Law 100
Vault (2026) — #5 overall prestige - Chambers USA
Chambers and Partners — Top-tier across multiple practice areas
Practice Areas
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