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Katie A. Reilly


P. 303.244.1983 | F. 303.244.1879
"A formidable litigator" and "a very creative and solution-oriented attorney."
—Peer and client comments, respectively, to Chambers USA


Katie Reilly represents clients in complex commercial litigation, including antitrust matters and class actions in highly regulated industries. BTI Consulting named Katie a nationwide 2022 Client Service All-Stars MVP based on input from corporate counsel, and Chambers USA ranks her for commercial litigation in Colorado. For five straight years, Law Week Colorado has named Katie either the "Barrister's Choice" or “People’s Choice” Best Antitrust Lawyer. Katie serves on the firm's five-member management committee.

Katie has favorably represented antitrust clients in matters involving monopolization, conspiracy, price fixing, exclusive dealing, and other competition-related disputes, including trade secrets and non-compete actions. She has extensive knowledge of the regulatory hurdles and obligations her clients face, and she develops effective litigation and trial strategies based on her clients' business priorities. Katie also routinely provides antitrust counseling to clients in connection with their formation of joint ventures, development of pricing policies, collaborations with competitors, and other activities potentially involving antitrust laws.  

Katie's additional commercial litigation experience includes successfully representing clients in business disputes at both the trial and appellate levels. Her experience includes contract disputes, business divorces, consumer fraud, and business tort claims. Katie has extensive healthcare industry experience, as well as real estate, energy, aviation, manufacturing, sports, and telecommunications. Katie also represents municipalities in high-stakes and often contentious disputes involving other municipal entities.


Class Actions

  • Won voluntary dismissal of putative class action claims for one of the nation's largest health and wellness franchisors. The plaintiff claimed our client and the franchisee refused to refund her massage spa membership.
  • Representing a major North American resort owner and operator in multiple consumer class actions seeking refunds following the company's closure of its ski resorts during the COVID-19 pandemic.
  • Won Montana Supreme Court victory for a health system in a putative consumer class action that challenged its policy of issuing refunds in the form of pre-paid debit cards. The victory affirmed WTO's prior summary judgment win and defeated the plaintiff's new claims on appeal.
  • Serving as lead counsel for natural gas company in antitrust class action alleging wholesale price manipulation and seeking damages in excess of $2 billion.
  • Serving as lead counsel to a health system to defend against a putative consumer class action in Montana challenging medical records charges.
  • Beltran v. Noonan et al. (D. Colo. 2019) - Successfully represented multiple defendants in a $2.1 billion federal antitrust and labor class action challenging the au pair exchange program administered by the Department of State. After four years of litigation, and just two months before trial, WTO helped to negotiate settlement for the defense group, resulting in defendants paying only 3% of the demand.
  • Successfully defended a telecommunications company in a state and federal putative class action in Washington arising out of an alleged data breach.

Antitrust & Competition

  • Successfully represented one of the nation's largest grocery and foodservice distributors as a direct action plaintiff in antitrust litigation concerning broiler chickens.
  • Successfully negotiated a class settlement—for 2.5% of the claimed damages—for a major utility provider and its subsidiary in a 15-year-old putative antitrust class action in Colorado federal court.
  • Fitness Together Franchise, L.L.C. v. EM Fitness, L.L.C. (D. Colo. Oct. 16, 2020 ) - Won a preliminary injunction for one of the nation's largest health and wellness franchisors against three competing fitness and nutrition studios that had stolen our client's trade secrets, infringed on its trademarks, and breached non-compete obligations.
  • Representing a nonprofit film society as a plaintiff in a circuit-dealing monopoly case against the nation's largest exhibitor of specialty films.
  • Representing a nation-leading cable operator in a high-stakes and high-profile antitrust dispute brought by a regional content provider.
  • Successfully defended a leading technology distributor against claims of civil conspiracy and trade secret misappropriation brought by former competitors, who sought tens of millions of dollars in damages. Following full discovery and a Daubert hearing, plaintiffs dismissed all claims on the eve of trial without any settlement or payment from WTO's client.
  • Won WTO's motion to dismiss a federal antitrust action for a New Mexico healthcare trade association accused of conspiring to exclude healthcare providers from market.
  • Won motions to dismiss all antitrust claims against our client, a leading technology distributor, in multiple related antitrust conspiracy lawsuits brought by former distributors.
  • EPMM Colorado v. Green Cross Colorado (Denver Cnty. Dist. Ct. 2015) - Won reversal of a TRO that had been issued ex parte at the close of business on a Friday, effectively shutting down operations for a major manufacturing and distribution client, and subsequently won rejection of the injunction against WTO's client.
  • Successfully represented a healthcare trade association in an $80 million federal antitrust lawsuit alleging conspiracy among the trade association, health systems, and health insurance companies.
  • JetAway Aviation v. Board of County Commissioners of the County of Montrose, Colorado (D. Colo.; 10th Cir.) - Won summary judgment from trial court and successfully defended that order before the Tenth Circuit in a federal antitrust lawsuit alleging conspiracy to monopolize fixed-base operations at an airport.
  • TOG & Wild Harvest v. U.S.P.S. (D. Colo. 2012) - Successfully defended a government contractor in a federal antitrust class action and obtained early dismissal of tying and monopolization claims asserted by franchisee plaintiffs.
  • Defended a health system against antitrust claims and state law claims in multiple lawsuits brought by physicians relating to failed joint ventures.
  • Counseled healthcare providers regarding antitrust implications of joint venture transactions, the development of integrated networks, ACOs, managed care contracting, and price and cost surveys among competitors.

Commercial Litigation

  • Jushi FL SPV, LLC v. San Felasco Nurseries, Inc. (AAA Case No. 01-10-0003) - Won a $14.3 million arbitration award, plus attorneys' fees and costs, for a multistate cannabis operator in a Florida franchise dispute involving lost royalties and right-of-first-refusal issues.
  • Provide legal counseling services to an international industrial gas company regarding pricing strategies in compliance with COVID-19-related state price-gouging laws.
  • Successfully represented a global industrial gas company in defense of a competitor's application for preliminary and mandatory injunctive relief, ultimately facilitating resolution of a dispute valued in the hundreds of millions of dollars on highly favorable terms.
  • Won summary judgment in a high-stakes commercial dispute between technology companies. WTO represented 10 of 12 defendants and served as lead counsel for the joint defense. At issue were questions of legality and fraud related to asset management and an outstanding loan owed by a business entity that had dissolved. WTO demonstrated that its clients had been fair and above-board, and that no fraud existed.
  • Successfully represented Aimco, one of the largest apartment owners in the U.S., in nationwide litigation alleging intentional torts against Airbnb. After jury selection in the first trial, Airbnb settled all litigation on terms allowing Aimco to control short-term rental activity consistent with its contract and property rights.
  • Won summary judgment in arbitration for a nation-leading telecom provider in an indemnification dispute with a former subcontractor whose employee filed a class action lawsuit in the Southern District of New York. Though the plaintiff was one classmember among thousands, WTO demonstrated that the subcontractor was liable to indemnify WTO's client for all of its attorneys' fees related to the class action and a pro rata share of the resulting settlement. WTO's client won $1.5 million, plus attorney fees.
  • Won a Tenth Circuit appeal for a leading U.S. railroad operator defending a district court order that dismissed a third-party intervenor's claims against WTO's client based on lack of standing to enforce an EPA consent decree.
  • Successfully represented an aerospace supplier in a product liability action involving responsibility for a $10 million cleanup effort at a rocket manufacturing facility.
  • Successfully defended a Fortune 50 telecommunications conglomerate against allegations brought by a competitor that WTO's client breached FCC phone number portability regulations.
  • Successfully represented a leading regional healthcare network as lead trial counsel in a high-stakes trademark dispute against a national healthcare insurance provider.
  • Obtained dismissal for an insurance company client facing a civil RICO lawsuit in federal court, with risk of treble damages, for issuing a surety bond to a marijuana business as required by state regulations. The judge granted our client's motion to dismiss because the plaintiffs failed to plausibly allege injury sufficient to establish RICO standing.
  • Won summary judgment for a major ski resort as plaintiff in a contract dispute involving a wireless infrastructure contractor.
  • Represented one of the nation's largest healthcare franchisors in a federal court action challenging the legality of the underlying business model.
  • Successfully represented a Colorado-based healthcare system in breach of contract action involving provision of home healthcare services.
  • Won a complete verdict in a bench trial in federal bankruptcy court involving claims of fraud alleged in a business divorce.
  • Represented a health system and obtained favorable settlement in a breach of contract action based on the termination of a management services contract for a Colorado hospital's oncology department.
  • ThermaSol v. Gems Sensors (Cal., Ventura Cnty. Super. Ct.) - Defended a manufacturing company against a multimillion-dollar breach of warranty claim involving allegedly defective parts and negotiated a favorable settlement of less than 10 percent of the damages claimed.
  • Hammond v. Opler (Colo. Boulder Cnty. Dist. Ct. 2008) - Obtained a favorable verdict and monetary damages in a one-week jury trial based on an extreme and outrageous conduct claim.
  • Represented the founders of a major ski resort in a two-week jury trial against a leading mountain resort company in a breach of contract action.
  • Represented a Fortune 100 telecommunications company in a favorable appeal in the U.S. Court of Appeals for the D.C. Circuit involving the application of Federal Communications Commission (FCC) regulations.
  • Bristol Bay Productions v. Lampack (Colo. Denver Dist. Ct. 2008) - Won dismissal from trial court for publisher Simon & Schuster in a case involving a movie studio's $50 million damages claim relating to the movie Sahara and alleging false representation of popular novelist Clive Cussler's readership figures.


  • Obtained complete dismissal with prejudice for two real estate investment clients facing claims brought by a municipal district seeking hundreds of millions of dollars in damages. The plaintiff alleged violations of the Colorado Organized Crimes Control Act, breaches of fiduciary duties, aiding and abetting such breaches, civil conspiracy, and more.
  • Represented the City of Aurora in a Rule 106 action against the City of Greenwood Village involving an intergovernmental agreement between the cities under which Greenwood Village transferred development authority of a real estate parcel to Aurora.
  • Represented Denver International Airport in high-profile claims involving alleged bid rigging and unfair competition relating to a $50 million terminal concessions contract.
  • Represented Denver International Airport against the Regional Transportation District in a dispute over cost-sharing agreements involving a new rail line serving the airport.
  • Represent citizens in a lawsuit against a municipality alleging a violation of the Colorado Taxpayer Bill of Rights (TABOR).

Real Estate


Other Experience

Husch Blackwell
Jacobs Chase
Cravath, Swaine & Moore, Summer Associate

Legal Memberships, Activities, and Honors

Chambers USA
    Band 2, General Commercial Litigation - Colorado, 2021, 2022
    Band 3, General Commercial Litigation - Colorado, 2020
    Band 4,
General Commercial Litigation - Colorado, 2018-2019
    Up and Coming, General Commercial Litigation - Colorado, 2016-2017
BTI Consulting
   Client Service All-Star MVP, 2020, 2022    
   Client Service All-Star, 2019 
International Association of Defense Counsel
The Best Lawyers in America
    Litigation - Antitrust Lawyer of the Year, Denver, 2021, 2023
Commercial Litigation, 2018-2023
    Antitrust Litigation, 2018-2023
    Mass Tort Litigation / Class Actions - Defendants, 2022-2023
Benchmark Litigation
    Under 40 Hot List, 2016-2017
    Future Star, 2021-2023
5280 Magazine
    Top Lawyers
        Antitrust, 2020-2021
        Civil Litigation, 2021
Law Week Colorado
    Top Women Lawyers, 2016
    "People's Choice" Antitrust Lawyer, 2016-2018, 2020
    "Barrister's Best" Antitrust Lawyer, 2019
Denver Business Journal
    "Forty Under 40," 2012
Colorado Super Lawyers
    Antitrust Litigation, 2017-2022
    Top 100, 2018-2022
    Top 50 Women, 2018-2022
Colorado Rising Stars 
    Business Litigation, 2009-2016
Institute for the Advancement of the American Legal System
    Chair, Law Firm Council, 2020
    Board of Advisors, 2020
Law School. . . Yes We Can
    Building Futures Fundraiser Co-Chair, 2021
American Health Lawyers Association 
    Antitrust Practice Group 
Colorado Lawyers Committee
    Board of Directors, 2008-2014 
    Sixth Amendment Task Force
Colorado Judicial Institute
    Board Member
Colorado Women's Bar Association Foundation
    Board of Directors, 2014-present
Colorado Women's Bar Association
Faculty of Federal Advocates
    Counsel/Co-counsel Program
University of Colorado Law School
    Dean’s Advisory Council, 2013-present

Community Memberships, Activities, and Honors

Denver Kids Inc.
    Board Chair, September 2017-2018
    Board of Directors, 2010-2019
    Executive Committee, 2012-2019
    Mentor, 2006-2014
The Women’s Leadership Foundation, Colorado Women’s Chamber of Commerce
    Charter Member, Board Bound Program
Denver Metro Chamber of Commerce
    Leadership Denver Program, Class of 2011
Denver Metro Chamber Leadership Foundation
    Impact Denver Program, Class of 2007
La Conexión
    Board of Directors, 2006-2007
The Women's Foundation of Colorado
    Corporate Committee, 2011-2013

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