Olson Grimsley

What Olson Grimsley does

Olson Grimsley Kawanabe Hinchcliff & Murray LLC is a Denver-based national plaintiffs litigation boutique founded in September 2023 by five former Bartlit Beck trial lawyers: Eric Olson (former Solicitor General of Colorado), Sean Grimsley (former Assistant Federal Public Defender and BP Oil Spill Commission counsel), Kenzo Kawanabe (former Pro Bono Partner at a 100-year-old Denver firm), Abigail Hinchcliff (former First Assistant AG of Colorado's Consumer Fraud Unit), and Jason Murray. The firm handles high-stakes civil cases spanning civil rights, antitrust, mass torts, consumer protection, constitutional litigation, human trafficking claims, and immigration rights, representing individuals, businesses (including Fortune 500 companies such as Arconic and Otterbox), nonprofits, advocacy organizations, and government entities from state trial courts through the U.S. Supreme Court. In its first two years, the firm tried seven cases to judgment and handled four appeals, obtaining more than $80 million in judgments, while team members have recovered over $2 billion for clients over their careers.

The firm's service portfolio is organized as eight integrated practice areas: civil rights litigation, antitrust litigation, mass tort litigation (notably preterm infant formula NEC cases against Mead Johnson and Abbott), consumer rights litigation, human rights and trafficking litigation, immigration rights litigation, appellate litigation, and pro bono public interest litigation. More than one-third of the firm's work is performed pro bono. Business operations are supported by a litigation manager, paralegal, legal assistant, and head of operations with backgrounds in document management, trial technology, and organizational systems from prior roles at Bartlit Beck LLP and other institutions. By early 2026 the team had expanded to eight partners (three promoted in January 2026) plus three associates and operations staff.

The firm operates on a contingency fee model for plaintiff-side engagements (a percentage of recovered damages, typically 25%-40%) supplemented by hourly billing on select matters and significant pro bono work. Distribution is direct client engagement through inquiries submitted to [email protected] and a growing network of referral relationships with co-counsel firms including Keller Postman, Sparacino PLLC, Korein Tillery, Towards Justice, ACLU of Colorado, CREW, and Freed Kanner London & Millen. The firm practices nationwide from its single Denver headquarters at 700 17th Street, Suite 1600, with cases active across all 50 states and arguments before the U.S. Supreme Court and Colorado Supreme Court.

Name

Olson Grimsley

Legal name

Olson Grimsley Kawanabe Hinchcliff & Murray LLC

Website

https://olsongrimsley.com

Company type

Private

Founded year

2023

Operating status

Operating

Headcount range

11–50 employees

Short description

Olson Grimsley is a Denver-based national plaintiffs litigation boutique representing individuals, businesses, nonprofits, and government entities in high-stakes civil rights, antitrust, mass tort, consumer, and constitutional cases across all 50 states.

Ownership category

akta.pro rank

Product category

Plaintiffs Impact Litigation

NAICS

Offices of Lawyers (54111), Legal Services (5411)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Litigation Support & Expert Witness Services (BPAHALAG)

Keywords

• Civil rights litigation
• Antitrust litigation
• Mass tort litigation
• Consumer rights litigation
• Appellate litigation

Headquarters

HQ city

Denver

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Legal Services - Contingency and Hourly Fee Representation: The firm handles plaintiff-side litigation on contingency fee basis (a portion of recovered damages) and may also bill hourly for certain matters. The firm has recovered over $2 billion for clients and obtained over $150 million in judgments in recent years.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Olson Grimsley is a national plaintiff-side impact litigation law firm representing individuals, businesses, nonprofits, and government entities in high-stakes civil trials and appeals across the United States. Its core practice covers civil rights, antitrust, mass tort, consumer rights, constitutional, human trafficking, and immigration litigation. Services are delivered through direct representation in trials and appellate courts including the U.S. Supreme Court, with most matters handled on contingency fee and a meaningful portion performed pro bono.

Product overview

Olson Grimsley is a national impact litigation law firm offering a unified suite of legal services centered on high-stakes trial and appellate litigation. The firm operates as a single integrated practice delivering civil rights, antitrust, mass tort, consumer rights, human rights, immigration rights, and appellate litigation services. Rather than separate product lines, the firm functions as a full-service plaintiffs litigation boutique with attorneys handling cases from trial through appeal, with over a third of work performed pro bono.

Differentiator

Problem solved

Functional benefit

Products and services

• Civil Rights Litigation Representation of individuals and groups in constitutional and civil rights matters, including Fourteenth Amendment ballot access challenges and protections for transgender students before state and federal courts. Intended for individuals and advocacy organizations seeking enforcement of constitutional and statutory civil rights.
• Antitrust Litigation Plaintiff-side antitrust representation in price-fixing class actions and monopoly suppression cases against major corporations. Intended for businesses and individuals harmed by anticompetitive conduct, including affected consumers and corporate plaintiffs.
• Mass Tort Litigation Plaintiff-side representation in mass tort matters including preterm infant formula NEC product liability claims and Zantac cancer claims. Intended for individuals and families injured by mass-manufactured products.
• Consumer Rights Litigation Consumer protection representation including litigation against major property managers charging illegal junk fees and enforcement of consumer protection statutes. Intended for defrauded consumers and consumer classes seeking recovery of illicit fees and damages.
• Human Rights and Human Trafficking Litigation Representation of victims of human trafficking and overseas labor abuse, including litigation against entities involved in Qatar World Cup stadium construction. Intended for survivors of human trafficking and forced labor seeking accountability and damages.
• Immigration Rights Litigation Plaintiff-side challenges to government immigration enforcement practices, including warrantless arrest litigation against ICE. Intended for immigrants, immigrant communities, and advocacy organizations facing unlawful immigration enforcement.
• Appellate Litigation Appellate advocacy before state supreme courts, the U.S. Supreme Court, and federal circuit courts, including arguments on constitutional and civil rights matters. Intended for trial-court clients needing appeal or defense of adverse judgments, and parties seeking direct supreme-court review.
• Pro Bono Public Interest Litigation Free legal services advancing public-interest causes in civil rights, immigrant rights, and constitutional challenges, delivered through direct representation. Intended for individuals, advocacy groups, and underserved communities needing impact litigation counsel.

Quantifiable outcome

• Over $150 million in judgments obtained from defendants represented by AmLaw 50 law firms in last three years
• +2 more outcomes

Named customers7 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

13 partnerships are on record, tiered core and minor.

• Freed Kanner London & MillencoreStrategic or Co-development Partner · 16 October 2025Co-counsel in antitrust class action MDL transferred to Colorado alleging Dick's Sporting Goods, Bass Pro Shops, Archery Trade Association and others conspired to fix archery product prices. First MDL in Colorado in more than 15 years.
• ACLU of ColoradocoreStrategic or Co-development Partner · 9 October 2025Partnership filing class action lawsuit challenging ICE's warrantless arrests in Colorado. Achieved preliminary injunction and class certification barring warrantless arrests. Federal judge granted statewide injunction in November 2025.
• Meyer Law OfficecoreStrategic or Co-development Partner · 9 October 2025Partnership with ACLU of Colorado and Olson Grimsley in immigrant rights class action against ICE warrantless arrests. Immigration attorney for plaintiffs.
• Towards JusticecoreStrategic or Co-development Partner · 15 April 2025Partnership representing tenants challenging Greystar (nation's largest property manager) for charging illegal junk fees. Colorado Supreme Court consolidated cases before district judge requested by OG.
• EdelsonminorStrategic or Co-development Partner · 15 April 2025Co-counsel with Towards Justice in tenant junk fee litigation against Greystar.
• Cadiz LawminorStrategic or Co-development Partner · 15 April 2025Co-counsel with Towards Justice in tenant junk fee litigation against Greystar.
• Korein TillerycoreStrategic or Co-development Partner · 5 September 2024Partnership to represent 300+ former college athletes in antitrust lawsuit against NCAA and Power Five conferences seeking fair share of television revenue. Claims proceeding in federal court in Colorado.
• Keller Postman LLCcoreStrategic or Co-development Partner · 13 March 2024Co-counsel partnership in preterm infant formula NEC mass tort litigation. Partnered with Keller Postman on the landmark $60 million Enfamil verdict - the first preterm infant formula case to reach verdict nationwide. The firm served as lead trial counsel with Keller Postman managing case preparation.
• The Cates Law Firm, LLCcoreStrategic or Co-development Partner · 13 March 2024Co-counsel partnership in Enfamil preterm infant formula NEC case. Partner Dave Cates worked alongside Olson Grimsley as lead trial counsel team achieving $60 million verdict.
• Citizens for Responsibility and Ethics in Washington (CREW)coreStrategic or Co-development Partner · 19 December 2023Partnership in Colorado ballot access case challenging Donald Trump's eligibility under 14th Amendment. OG served as lead counsel through state courts to U.S. Supreme Court.
• Tierney Lawrence Stiles LLCminorStrategic or Co-development Partner · 19 December 2023Co-counsel in Trump 14th Amendment ballot access case.
• KBN Law, LLCminorStrategic or Co-development Partner · 19 December 2023Co-counsel in Trump 14th Amendment ballot access case.
• Sparacino PLLCcoreStrategic or Co-development Partner · 14 October 2023Ongoing partnership representing Filipino workers alleging human trafficking to build Qatar's 2022 FIFA World Cup stadiums. First case against Jacobs Solutions and CH2MHill (2023), second case against Ogilvy and Omnicom (2025).

Scale indicators10 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• Lieff Cabraser Heimann & Bernstein: San Francisco-based nationally recognized plaintiffs firm with a leading mass tort, consumer protection, and class action practice. Closely comparable in plaintiff-side impact litigation and elite trial lawyer talent bench.
• Baron & Budd P.C. Dallas-based national plaintiffs firm specializing in mass tort, environmental, and product liability litigation. Comparable in plaintiff-side contingency model and national reach in complex tort matters.
• Susman Godfrey LLP: Houston-based elite national trial firm handling high-stakes commercial, antitrust, and plaintiff litigation. Compares to Olson Grimsley as a similarly sized boutique of elite trial lawyers taking on AmLaw 100 defendants in bet-the-company matters.
• Weitz & Luxenberg P.C. New York-based mass tort and class action plaintiffs firm with a leading product liability practice. Comparable in contingency-fee plaintiff model and national trial footprint.
• Keller Postman LLC: Chicago-based mass tort and class action plaintiffs firm that co-led the landmark $60M Enfamil NEC verdict with Olson Grimsley. Directly comparable in mass tort leadership and contingency-fee model.
• Motley Rice LLC: Mount Pleasant, SC-based national plaintiffs firm known for asbestos, opioids, and complex mass tort leadership. Comparable in plaintiff-side scale, contingency economics, and impact-litigation ambition.
• Korein Tillery LLC: St. Louis-based elite plaintiffs firm focused on antitrust and mass tort litigation, currently co-counsel with Olson Grimsley in the NCAA television-revenue antitrust case. Closely comparable in antitrust plaintiff practice and trial intensity.
• Edelson PC: Chicago-based consumer protection and class action plaintiffs firm, currently co-counsel with Olson Grimsley on tenant junk-fee litigation. Comparable in consumer-rights plaintiff practice and impact litigation mission.

Broad incumbents

• Bartlit Beck LLP: Chicago-based elite trial firm where four of the five Olson Grimsley founders previously practiced for 11-17 years. Directly comparable in trial excellence and case complexity, though substantially larger and more defense-oriented.
• Quinn Emanuel Urquhart & Sullivan: The largest litigation-only global law firm, with extensive plaintiff and defense capabilities across antitrust, commercial, and mass tort. Comparable in trial intensity and elite talent, but operates at materially greater scale and geographic breadth.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles14 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 Olson Grimsley