If you’re looking for a Denver class action lawsuit lawyer, the city has a concentrated bench on both sides of this work: plaintiff-side firms like Burg Simpson, Wagstaff Law Firm, Franklin D. Azar & Associates, Towards Justice, and Berger Montague file cases on behalf of consumers and workers, while Wheeler Trigg O’Donnell and the Denver offices of Baker & Hostetler, Bryan Cave Leighton Paisner, Bartlit Beck, Shook Hardy & Bacon, and Polsinelli defend the companies on the other side.1Best Law Firms. Mass Tort Litigation Class Actions Plaintiffs Colorado2Super Lawyers. Class Action and Mass Torts Attorneys in Denver Most plaintiff-side lawyers in this space work on contingency, meaning you pay nothing up front and the firm’s fee comes out of any recovery.
Plaintiff-Side Firms and What They Handle
The 2026 Best Law Firms rankings place four Colorado firms in the top tier for mass tort litigation and plaintiff-side class actions: Burg Simpson Eldredge Hersh & Jardine, Purvis Thomson, Fennemore, and Wagstaff Law Firm.1Best Law Firms. Mass Tort Litigation Class Actions Plaintiffs Colorado
Burg Simpson, headquartered in Englewood near Denver, operates nine offices across seven states with more than 70 attorneys. The firm handles class actions involving consumer fraud, product liability, data breaches, antitrust violations, environmental disasters, and employment law.3Burg Simpson. Colorado Class Actions Michael S. Burg, Seth A. Katz, and Peter W. Burg are listed as top-rated class action practitioners by Super Lawyers.2Super Lawyers. Class Action and Mass Torts Attorneys in Denver
Wagstaff Law Firm, on Denver’s Lincoln Street, has built a national profile in mass tort and multidistrict litigation. Partner Aimee Wagstaff serves as national co-lead counsel in the transvaginal mesh MDL and was lead trial counsel in the Roundup case Hardeman v. Monsanto, which produced a unanimous jury verdict exceeding $80 million.4Wagstaff Law Firm. Aimee H. Wagstaff The firm reports more than $135 million in jury verdicts in TVM litigation alone and contributed to over $1.6 billion in defense resolution commitments across those cases.5Wagstaff Law Firm. Case Results
For wage theft, misclassification, and worker rights cases, Towards Justice is one of the most active filers in Colorado. The Denver-based nonprofit law firm represents construction laborers, gig-economy drivers, and detained workers, and secured a $65.5 million settlement for roughly 100,000 au pairs establishing that au pair stipends constitute minimum wages.6Towards Justice. Annual Report In Solis v. The Circle Group, Towards Justice represented drywall installers at the SkyHouse Denver high-rise and settled in 2017 for over $800,000, covering 150 to 200 workers.7Denver Post. Workers Who Hung Drywall at SkyHouse Denver Receive 800K Wage Settlement
Franklin D. Azar & Associates files Denver consumer class actions, including one of the January 2026 contaminated-gasoline cases.8Denver Post. Contaminated Gas Colorado Sinclair Lawsuit Berger Montague filed a parallel class action in the same matter.9Colorado Politics. Contaminated Gas Fiasco Impacts Hundreds of Motorists in Colorado National firms with Denver offices also take on plaintiff work; Cohen Milstein Sellers & Toll served as lead counsel in the InnovAge securities fraud case.10Cohen Milstein. Texas and Indiana Pension Funds v. InnovAge Holding Corp.
For civil rights class actions, the ACLU of Colorado has been active. In November 2025, a federal judge certified a class in Ramirez Ovando v. Mullin and ruled that ICE had conducted unlawful warrantless arrests in Colorado, issuing an injunction against the practice.11ACLU of Colorado. Cases
Defense-Side Firms
If you’re a company facing a class complaint, Wheeler Trigg O’Donnell is the Denver firm most prominent in this work. Founded in 1998 with roughly 100 trial lawyers, WTO is ranked among the top 14 firms in the country for class action defense by Chambers USA and has defeated class certification more than 175 times across hundreds of cases in at least 35 states.12Wheeler Trigg O’Donnell. Class Actions Its client roster includes Whirlpool, BP, Toyota, Ford, Michelin, General Electric, and Pfizer, with practices covering consumer fraud, product liability, antitrust, employment, and environmental defense.13Wheeler Trigg O’Donnell. Environmental Litigation Baker & Hostetler, Bryan Cave Leighton Paisner, Bartlit Beck, Shook Hardy & Bacon, and Polsinelli also have Denver attorneys recognized for class action and mass tort defense.2Super Lawyers. Class Action and Mass Torts Attorneys in Denver
What Denver Class Action Lawyers Are Filing Now
The kinds of cases Denver firms are actively taking tell you more about who to call than any directory listing.
Consumer Fraud and Product Defects
The biggest recent consumer matter is the HF Sinclair fuel contamination. In January 2026, up to 400,000 gallons of diesel-contaminated gasoline were distributed through a terminal in Henderson to as many as 48 retail stations across the Front Range, from Fort Collins to Colorado Springs.9Colorado Politics. Contaminated Gas Fiasco Impacts Hundreds of Motorists in Colorado Drivers reported stalled engines and repair bills reaching $7,500.14Denver7. Colorado Fuel Mixup Sparks Class Action Lawsuit At least two class actions were filed in Denver District Court: Franklin D. Azar & Associates named HF Sinclair, King Soopers, Costco, and Murphy Oil, and Berger Montague sued HF Sinclair and King Soopers’ parent, Dillon Companies.8Denver Post. Contaminated Gas Colorado Sinclair Lawsuit Both allege negligence, breach of warranty, and violations of the Colorado Consumer Protection Act. The state Division of Oil and Public Safety had logged more than 1,000 complaints as of the filing date.
Data Breach Cases
A late-2025 settlement resolved a class action against Rocky Mountain Gastroenterology Associates over a September 2024 cyberattack, providing cash payments and credit monitoring to affected patients.15ClassAction.org. Colorado Consumer Protection Act News Not every breach claim survives. In Henderson v. Reventics, a federal judge in the District of Colorado dismissed a case involving over 250,000 compromised patient records, finding plaintiffs had not shown a concrete injury because their data had not been misused.16Inside Class Actions. Colorado Federal Court Dismisses Data Breach Class Action for Lack of Article III Standing That decision is on appeal.
Wage and Hour
Wage theft and misclassification claims typically involve unpaid overtime, off-the-clock work, misclassifying employees as independent contractors or exempt professionals, and unlawful wage deductions.17Towards Justice. Wage Theft and Misclassification A 2025 Colorado Supreme Court decision reshaped the timing of these claims. In By the Rockies LLC v. Perez, the court set a two-year statute of limitations for Colorado Minimum Wage Act claims, extending to three years for willful violations.18Jackson Lewis. Colorado Supreme Court Sets Two-Year Clock on State Minimum Wage Act Claims If you suspect wage violations at your job, waiting too long shrinks the recovery window.
Securities Fraud
The largest recent Denver-area resolution was the InnovAge case. InnovAge Holding Corp., a Denver-based healthcare company that went public in March 2021, was sued by pension funds alleging its IPO registration statement concealed staffing shortfalls and patient-care problems. After CMS suspended new enrollments at one facility, the stock dropped 78%.10Cohen Milstein. Texas and Indiana Pension Funds v. InnovAge Holding Corp. In December 2025, Judge William J. MartÃnez granted final approval of a $27 million settlement.19Cohen Milstein. Court Approves 27M Cash Settlement in InnovAge Securities Fraud Class Action Not every securities case survives: a putative class action against Palantir Technologies was dismissed with prejudice in April 2025.20A&O Shearman. Colorado District Court Dismisses Putative Class Action Against Software Company
What a Class Action Lawyer Will Cost You
Plaintiff-side class action work in Colorado is almost always handled on a contingency basis, and Colorado’s Rules of Professional Conduct require that all attorney fees be reasonable. Contingency fee agreements must be in writing, signed by the client, and specify the percentage and the method of calculation, including whether the fee is taken before or after costs are deducted.21Colorado Bar Association. Rule 1.5 Nonrefundable retainers are prohibited, and any unearned portion of a fee is subject to refund.
In class settlements, courts review attorney fee requests under prescribed procedures, and the fee must remain reasonable in light of the case’s complexity, the time devoted, and the benefit obtained for the class.21Colorado Bar Association. Rule 1.5 One important Colorado quirk affects Consumer Protection Act cases: individual CCPA plaintiffs can recover attorney fees from the defendant, but the statute prohibits a fee award in CCPA class actions specifically.22Justia. Colorado Revised Statutes Section 6-1-113 That means in a CCPA class case, the attorneys’ compensation has to come from the settlement fund itself.
Successful CCPA plaintiffs recover the greater of their actual damages or $500, plus court costs. If the defendant’s conduct was fraudulent, willful, knowing, or intentional, courts must award treble damages once that standard is met by clear and convincing evidence.22Justia. Colorado Revised Statutes Section 6-1-113
Do You Actually Need to Hire a Lawyer?
Many people searching for a class action lawyer don’t need to retain one. If a case has already been filed and you were affected, you are usually in the class automatically. Most class actions are opt-out: a person is part of the class unless they affirmatively request exclusion, which they might do if they want to file their own lawsuit instead. Some employment cases, particularly wage-and-hour claims, work the other way and require affected workers to opt in.23ClassAction.org. How to Join a Class Action
When a case settles, class members typically must file a claim form by a stated deadline to receive compensation. Forms come through official settlement websites, mail, or email. Some settlements require proof of purchase; others don’t. Participating costs nothing, but accepting a settlement generally means giving up the right to sue the defendant individually over the same allegations.23ClassAction.org. How to Join a Class Action
You need a lawyer when you want to start a case, when your damages are large enough that filing individually might serve you better than staying in a class, or when you’ve been named as a defendant.
What the Lawyer Will Check Before Filing
Colorado class actions are governed by Colorado Rule of Civil Procedure 23. Before any case can proceed on behalf of a group, the plaintiffs must prove four things: the proposed class must be large enough that individual lawsuits would be impractical, the claims must share common legal or factual questions, the named plaintiffs’ claims must be typical of the broader group, and the representatives must be capable of fairly protecting the class’s interests.24JBaker Law Group. Colorado Lawsuit Lawyer Colorado courts have certified classes with fewer than 30 members and denied certification for groups larger than 100, so there is no bright-line number for “numerosity.” The class must also fit one of four categories under Rule 23(b), most commonly that shared questions predominate over individual ones and that a class action is the superior method for resolving the dispute.25JD Porter Law. Class Action Lawsuits in Colorado State Courts
For CCPA claims, a private plaintiff also has to prove the deceptive practice significantly impacted the public. Courts weigh the number of consumers affected, their relative sophistication and bargaining power, and whether the practice has impacted or could impact others.22Justia. Colorado Revised Statutes Section 6-1-113 Expect intake questions aimed at these elements. The more concrete your documentation of the harm and the pattern, the more useful your first call will be.