Oberdier Ressmeyer

What Oberdier Ressmeyer does

Founded in September 2011 by Carl W. Oberdier and Kellen G. Ressmeyer after they departed a Chicago-based Am Law 200 firm, Oberdier Ressmeyer LLP is a three-attorney New York litigation boutique operating as a limited liability partnership out of 655 Third Avenue, 28th Floor. The firm offers three core service lines — Litigation Services in U.S. federal and state courts, International Arbitration before ICC, UNCITRAL, and HKIAC tribunals, and Regulatory Proceedings — and concentrates on high-stakes commercial matters rather than volume practice.

Its client base spans Fortune 50 companies, major financial institutions, state-owned enterprises (including Chinese steel and semiconductor SOEs), the largest Sino-Foreign JV asset manager, one of the world's largest PE funds, and select high-net-worth individuals. The firm has secured favorable outcomes in over 90% of matters handled, including nine cases exceeding $200 million and three exceeding $1 billion, with over $3 billion in aggregate claims managed in recent years.

Revenue is generated through professional services fees — primarily hourly billing and fixed or success-fee arrangements on complex matters — with engagement driven by attorney reputation, Chambers and Super Lawyers rankings, and referral networks rather than sales infrastructure. There is no proprietary technology platform; service delivery is attorney-led and bespoke, reflecting the firm's boutique positioning.

Name

Oberdier Ressmeyer

Legal name

Oberdier Ressmeyer LLP

Website

https://oberdier.com

Company type

Private

Founded year

2011

Operating status

Operating

Headcount range

1–10 employees

Short description

Oberdier Ressmeyer LLP is a three-attorney New York litigation boutique founded in 2011, representing Fortune 50 companies, large financial institutions, foreign state-owned enterprises, and high-net-worth individuals in complex commercial litigation, international arbitration, and regulatory proceedings.

Ownership category

akta.pro rank

Product category

Legal Services — Commercial Litigation and International Arbitration

NAICS

Offices of Lawyers (541110), Legal Services (5411)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Litigation Support & Expert Witness Services (BPAHALAG)

Keywords

• Commercial litigation
• International arbitration
• Regulatory proceedings
• Litigation boutique
• Cross-border disputes

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Infrastructure, Others

Revenue model

1. Legal Services Fees: Revenue generated from legal representation in commercial litigation, international arbitration, and regulatory proceedings. Fee structures likely include hourly billing, fixed fees for specific matters, and potentially contingency or success fee arrangements for certain cases.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Oberdier Ressmeyer LLP is a New York litigation boutique representing Fortune 50 companies, large financial institutions, state-owned enterprises, multinational corporations, and individuals in complex commercial litigation, international arbitration, and regulatory proceedings. The firm handles matters involving contracts, partnership disputes, private equity, real estate, securities, intellectual property, and cross-border disputes across federal and state courts, ICC, UNCITRAL, and HKIAC tribunals.

Product overview

Oberdier Ressmeyer LLP is a New York-based litigation boutique law firm offering three core legal service offerings: Litigation Services, International Arbitration, and Regulatory Proceedings. The firm specializes in complex commercial disputes, representing both U.S. and international clients including Fortune 50 companies, state-owned enterprises, and high-net-worth individuals. The practice handles matters involving contracts, partnership disputes, private equity, real estate, securities, intellectual property, and cross-border arbitrations spanning multiple industries and jurisdictions.

Differentiator

Problem solved

Functional benefit

Products and services

• Litigation Services Full-service commercial litigation representation in federal and state courts, including trials, appeals, and complex commercial matters spanning contracts, partnership and business disputes, private equity and venture capital, real estate and construction, finance, securities, corporate governance, trademark, trade dress, trade secrets, copyright, patents, digital piracy, economic espionage, e-commerce, unfair competition, bankruptcy, class actions, employment, and products liability. Represented by attorneys with prior Am Law 200 firm and federal judicial clerkship experience.
• International Arbitration Cross-border arbitration representation before the International Chamber of Commerce (ICC), UNCITRAL tribunals, and Hong Kong International Arbitration Centre (HKIAC), handling disputes involving sovereign entities, state-owned enterprises, and multinational corporations across jurisdictions spanning the U.S., Asia, Europe, the Middle East, and South America.
• Regulatory Proceedings Administrative and regulatory representation before government agencies and in enforcement actions, covering securities, financial services, and commercial matters, including securities class action and arbitration defense (e.g., Harvest USA case).

Quantifiable outcome

• Over 90% favorable outcomes in cases handled
• +3 more outcomes

Named customers19 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Five partnerships are on record, tiered minor.

• Burmese Center for Community Education (BCCE)minorStrategic or Co-development PartnerThe firm collaborates annually with BCCE to sponsor initiatives such as the five-day 'Summer Freedom Trip' to Washington D.C. for twenty high school students and the BCCE Winter School offering language and math training to 91 middle school children. Ms. Ressmeyer serves on the Advisory Board of BCCE.
• MFY Legal Services - Kinship Caregiver Law ProjectminorStrategic or Co-development PartnerFabrizio Grasso provides pro bono legal services through this project, which provides advice, counsel and representation to grandparents and family members who are taking care of related children, helping prevent children from entering the foster care system.
• Lambda LegalminorStrategic or Co-development PartnerFirm supports Lambda Legal, a national organization committed to achieving full recognition of the civil rights of lesbians, gay men, bisexuals, transgender people and everyone living with HIV through impact litigation, education and public policy work.
• Center for Constitutional Democracy in Plural SocietiesminorStrategic or Co-development PartnerMs. Ressmeyer serves as a research fellow with this center at Indiana University and has contributed her expertise by advising and collaborating with the constitutional drafting committees of Burma's federated states, advancing governance reforms and the rule of law.
• Park Avenue ArmoryminorStrategic or Co-development PartnerFirm supports the Park Avenue Armory, a cultural institution in New York City that presents unconventional performances and installations.

Scale indicators3 records

Recent moves1 record

Expansion highlights4 records

Direct peers

• Boies Schiller Flexner: Premier litigation boutique with comparable high-stakes commercial litigation and arbitration practice serving major corporates and financial institutions; competes directly for bet-the-company matters.
• Cohen Milstein Sellers & Toll: Plaintiffs-side litigation boutique with strong securities class action and complex commercial litigation practice; comparable boutique scale and high-value case profile in securities and commercial disputes.
• Kasowitz Benson Torres: New York-based litigation boutique focused on complex commercial litigation, representing major corporations and financial institutions in high-stakes disputes; similar clientele and case complexity.
• Lieff Cabraser Heimann & Bernstein: National plaintiffs' litigation boutique handling complex commercial, securities, and international matters; comparable boutique positioning and high-value case profile.
• Pomerantz LLP: Long-standing New York litigation boutique with deep securities class action and international commercial litigation practice, including representation of foreign issuers and SOEs—directly comparable to Oberdier Ressmeyer's securities and cross-border work.
• Susman Godfrey: Houston-founded elite litigation boutique specializing in commercial litigation, intellectual property, and antitrust; directly comparable in boutique structure, partner-driven origination, and nine-figure case profile.
• Quinn Emanuel Urquhart & Sullivan: Largest litigation-only global firm; directly competes with Oberdier Ressmeyer for high-stakes commercial litigation and international arbitration mandates from Fortune 500 clients, with similar partner-driven model but vastly deeper bench.

Broad incumbents

• Wachtell, Lipton, Rosen & Katz: Premier New York-based law firm representing Fortune 50 companies in high-stakes litigation, M&A, and corporate governance; overlapping client base and matter profile, but with much broader practice scope and larger bench.
• Cravath, Swaine & Moore: Elite New York full-service firm with strong commercial litigation practice serving large corporates and financial institutions; comparable clientele and case complexity, though with broader transactional offerings.
• Dechert LLP: Global law firm with strong international arbitration and commercial litigation practice, including sovereign and cross-border matters; comparable expertise area but with significantly broader geographic and practice footprint.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/Oberdier
• LinkedInlinkedin.com/company/oberdier-ressmeyer-llp

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Oberdier Ressmeyer