Jon J. Lambiras

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Jon J. Lambiras, Esq., CPA, CFE is a Shareholder in the Securities and Consumer Protection practice groups. Since joining the Firm in 2003, he has practiced primarily in the areas of securities fraud, consumer fraud, and data breach class actions.

In the Securities group, he concentrates on class action and opt-out litigation involving accounting fraud and financial misrepresentations made to investors. In the Consumer Protection group, he concentrates on unfair business practices and data breach litigation involving the theft of personal information by computer hackers. He has also litigated  Antitrust pay-for-delay matters involving drug manufacturers wrongly keeping generic drugs off the market.

Jon’s clients are plaintiffs such as individual investors, institutional investors, and consumers. He strives to provide a smooth, comfortable litigation experience for his clients. He welcomes inquiries from potential clients and referring counsel regarding new matters. Fees in his cases are generally earned on a contingent basis, meaning clients do not pay out-of-pocket attorneys’ fees.

Jon is an attorney, Certified Public Accountant, and Certified Fraud Examiner. Prior to law school, he practiced accounting for four years as a financial statement auditor, including with a Big-Four accounting firm.

Jon has obtained the highest peer review rating, “AV Preeminent,” in Martindale-Hubbell for his legal abilities and ethical standards. Also, for several years from 2012 to the present, he was selected for inclusion in “Pennsylvania Super Lawyers” or “Rising Stars,” an honor conferred on less than 5% of attorneys in Pennsylvania.

Jon has published numerous articles and lectured on various class action topics, as summarized below. He has also commented on class action issues for publications such as The Washington Post and The Legal Intelligencer, among others. The cases on which he worked have collectively settled for hundreds of millions of dollars.

While in law school, Jon was a Lead Articles Editor for the Pepperdine Law Review. His law review article was named Student Article of the Year by Pepperdine Law Review, i.e. best article among all student articles published that year.

Jon’s speaking engagements include the following:

  • “Securities Fraud Class Actions: A Primer for Certified Fraud Examiners,” 2018, presented to the Association of Certified Fraud Examiners
  • “Securities Fraud Class Actions: A Bird’s Eye View,” 2017, presented to the Delaware County Bar Association
  • “Securities Fraud Class Actions: A Bird’s Eye View for Attorney-CPAs,” 2017, presented to the Philadelphia Chapter of the American Association of Attorney-CPAs
  • “How the CFO Landed in Prison: The Nuts & Bolts of His Fraud,” 2012, presented to the Phila. Chap. of the Am. Assoc. of Attorney-CPAs
  • “State of the Cyber Nation Address,” 2011, presented at HB Litigation/NetDiligence Cyber Risk & Privacy Forum
  • “Data Breach Class Actions Involving Theft of Personal Information,” 2009, presented to the Phila. Chap. of the Am. Assoc. of Attorney-CPAs
  • “Class Actions Involving Estate Planning, Financial Planning, Trusts, and Income Tax,” 2009, presented to the Phila. Chap. of the Am. Assoc. of Attorney-CPAs
  • “Securities Fraud Class Actions: Comparing and Contrasting the Plaintiffs’ and Defendants’ View,” 2007, presented to the Phila. Chap. of the Am. Assoc. of Attorney-CPAs
  • “Securities Fraud Class Actions: A Primer for the Attorney-CPA,” 2006-08, presented to the Phila. Chap. of the Am. Assoc. of Attorney-CPAs
Jon has received the highest peer review rating, “AV Preeminent 5.0 out of 5.0,” in Martindale-Hubbell for his legal abilities and ethical standards.”

Professional Leadership

  • Past Officer of American Assoc. of Attorney-Certified Public Accountants, Philadelphia Chapter
  • Member of Speaker-Search Committee, Assoc. of Certified Fraud Examiners, Philadelphia Chapter

Business and Community Leadership

  • Jon is involved in various charitable activities. He has run food drives, clothing drives, toy drives, and blood drives at Berger Montague.

Prominent Judgments and Settlements

Securities Fraud

Data Breach Class Actions



Law School

Pepperdine University School of Law, 2003


Bryant College, B.S. in Accounting, cum laude, 1996

Honors & Awards:

  • Super Lawyer: 2017-2020

  • Super Lawyer Rising Star: 2012-2014


Jon has published articles including:


Member – Pennsylvania Bar

Member – California Bar

Member – Massachusetts Bar

Admitted – Eastern District of Pennsylvania

Admitted – Third Circuit Court of Appeals

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