Antitrust: Mainly Plaintiff
1 Ranked Lawyer
Firm PROFILE
Constantine Cannon LLP
USA 2026
Rankings
Leading firm in USA 2026
Ranked Departments
Ranked Departments
Ranked Individuals
Ranked Individuals
Top figures
34
Lawyers
3
Offices
1994
Established Year
Content provided by Constantine Cannon LLP
Overview
Provided by Constantine Cannon LLP
Constantine Cannon, with offices in New York, Washington, D.C., and San Francisco, is an internationally known law firm focused on antitrust and whistleblower representation. Its antitrust practice has secured three of the top five antitrust recoveries ever. The firm’s whistleblower practice has likewise secured record recoveries for the government and the firm’s clients amounting to more than $1.5 billion in total.
Industry sectors (11)
- Biotechnology & Pharmaceuticals
- Digital Platforms
- Electronic Commerce
- Electronic Payments
- FinTech & Financial Services
- Government Contracting
- Government Procurement
- Healthcare
- Insurance
- Securities/Commodities Regulation
- Transportation
Capabilities (5)
- Antitrust Litigation and Counseling
- Whistleblower Representation
- False Claims Act
- Whistleblower Rewards Programs (SEC, CFTC, FinCEN, IRS, NHTSA, DOJ)
- Complex Commercial Litigation
Clients (15)
- All Nippon Airways Co., Ltd.
- Amazon.com Inc.
- Booking Holdings Inc.
- Costco Wholesale Corp.
- CVS Health
- Dick’s Sporting Goods, Inc.
- Google LLC
- HDMI Licensing Administrator Inc.
- IKEA
- NIKE, Inc.
- Ralph Lauren Corp.
- Starbucks Corp.
- Gap Inc.
- Yum! Brands, Inc.
- Confidential whistleblower informants
Key people
Provided by Constantine Cannon LLP
Lloyd Constantine
Founder and Chairman Emeritus of Constantine Cannon LLP
W. Stephen Cannon
Chairman of Constantine Cannon LLP and Managing Partner of Constantine Cannon’s Washington, D.C., office.
Alysia Solow
Partner
Gordon Schnell
Partner
Ankur Kapoor
Partner
Taline Sahakian
Partner
Jean Kim
Partner
Owen Glist
Partner
Marlene Koury
Partner
Dan Vitelli
Partner
Work & experience
Provided by Constantine Cannon LLP
Constantine Cannon’s antitrust practice has extensive experience representing clients nationwide, from Fortune 100 businesses (including 4 of the top 10) to start-ups and individuals, and across all areas of antitrust and competition law and all industry sectors. The firm’s whistleblower practice has extensive experience representing whistleblowers under the wide array of whistleblower rewards statutes and programs. Our approach is to always be prepared to go to trial if necessary.
Notable work
Provided by Constantine Cannon LLP
In Re Payment Card Interchange Fee and Merchant Discount Litigation
Represented 60+ merchants challenging Visa/Mastercard interchange fees and anticompetitive network rules.
Sidibe et al. v. Sutter Health
$228.0M
Healthcare antitrust class action against Sutter Health; Ninth Circuit reversed defense judgment in 2024.
Multiple Record False Claims Act Recoveries, 2020-2026
New York, DC, and San Francisco
Constantine Cannon successfully represented the whistleblowers in multiple False Claims Act cases.
Ranked Offices at Constantine Cannon LLP
Provided by Constantine Cannon LLP
Ranked Departments at Constantine Cannon LLP (2)
Ranked Individuals at Constantine Cannon LLP (2)
New York
Ankur Kapoor
Antitrust: Mainly Plaintiff
View profile
USA - Nationwide
Gordon Schnell
Whistleblower Representation
View profile
Top figures
34
Lawyers
3
Offices
1994
Established Year
Content provided by Constantine Cannon LLP
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