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William B. Federman has practiced law for over thirty years and has extensive experience litigating and trying complex cases and class actions. Prior to founding Federman & Sherwood, Mr. Federman was a co-founder and managing director of Day, Edwards, Federman, Propester & Christensen, PC an Oklahoma City firm that merged three law firms together to create a 28 lawyer law firm that focused on serving the financial community and insurance companies and that received a top rating by A.M. Best. Mr. Federman has received the Martindale-Hubbell peer review rating of AV Preeminent for both ethical standards and legal ability. He has served on the Oklahoma County Bar Ethics Committee and has been honored as a featured speaker at many bar events, including the American Bar Association, the Houston Bar Association, and the Oklahoma Bar Association. Mr. Federman has served as Lead or Co-Lead for Plaintiffs and/or on the Plaintiffs’ Steering/Executive Committee for many consumer class actions, which most recently includes, among others:

  • In re Sonic Corp., a MDL transferred to the Northern District of Ohio, involving a data breach case causing the loss of consumers’ private information;
  • In re Samsung Top-Load Washing Machine Marketing, Sales Practices and Products Liability Litigation, a MDL transferred to the Western District of Oklahoma, involving defective home washing machines;
  • In re Farmers Insurance, a MDL transferred to the Western District of Oklahoma, challenging Farmers’ use of credit scores for setting premiums, that eventually settled for over $20 million for the class;
  • Home Depot, a MDL pending in the Northern District of Georgia, involving a data breach case causing the loss of consumers’ private information;
  • Dakota Growers, a class action in the District Court of Minnesota that was litigated in coordination with a later-filed, similar action in New Jersey, alleging the defendant mislabeled its products, which resulted in settlement and payments to class members of approximately $7 million.

Mr. Federman also has experience practicing in this Court, most recently as counsel for Lead Plaintiffs in In re Galena Biopharma, Inc. Derivative Litigation, Case No. 3:14-cv-382-SI (D. Ore., Portland Div.). Multiple lawsuits were filed in this jurisdiction as well as the Delaware Chancery Court. Mr. Federman and the other plaintiffs’ counsel worked cooperatively to bring all cases before this Court – so that the case can be efficiently and effectively prosecuted. 


  • Arbitration Panel, New York Stock Exchange, 1985;
  • Oklahoma County Bar Association (Member, Committee on Professionalism, 1987-1990);
  • Oklahoma, Texas, New York and American Bar Association (Committee on Securities Litigation and Corporate Counsel);
  • The District of Columbia Bar;
  • Securities Industry Association, Law and Compliance Division; Defense Research Institute;
  • American Inns of Court (Barrister, 1990-1993);
  • Martindale-Hubble – Received peer review rating of AV Preeminent in both ethical standards and legal ability; 
  • Litigation Counsel of America (Trial Lawyer and Appellate Lawyer Honorary Society);
  • Oklahoma Bar Association, Rules of Professional Conduct Committee (2020)


  • Securities Litigation and Arbitration Law Firm of the Year in Oklahoma – 2018 (Global Law Experts Annual Awards);
  • Securities Litigation and Arbitration Law Firm of the Year in Oklahoma – 2019 (Corporate INTL Magazine); and
  • Oklahoma Super Lawyers list by Thomson Reuters – 2019 (Recognized for Exceptional Service and Outstanding Performance on behalf of the Federal Bar Association (Oklahoma City Chapter) Pro Bono Program – 2018-2019), 2020. 


  • “Class Actions, New Rules and Data Breach Cases, 40th Annual OCBA Winter Seminar, 2019;
  • “A Case Study of Ethical Issues in Complex Litigation and Trends in Class Certification,” 39th Annual OCBA Winter Seminar, 2018;
  • “Talkin’ About Insurance Coverage and Complex Litigation: What Every Lawyer and Client Should Know,” presented by the 38th Annual OCBA Winter Seminar, 2017;
  • Securities Litigation:  Using Data to Make the Case,” presented by Bloomberg BNA, 2016;
  • The Changing Landscape for Prosecution of Financial Claims Involving Insolvent Companies presented at the 37th Annual Oklahoma County bar Association Winter Seminar, 2016;
  • Current Status of Securities Class Actions:  Where are the Court Taking Us?, presented by the Houston Bar Association at the Securities Litigation and Arbitration Section Meeting November 11, 2014; 
  • Class & Derivative Actions and Securities Litigation, presented by the Business and Corporate Litigation Committee at the 2013 Annual Meeting of the American Bar Association;
  • Inside a Disclosure Crisis, presented by the Northwest Securities Institute in conjunction with the Washington Bar Association at its 30th Annual Meeting;
  • Managing Directors’ Liability, presented by the 3rd Annual Energy Industry Directors’ Conference; sponsored by Rice University and The Law Firm of Fulbright & Jaworski;
  • Executive Liability – 2009 D & O Market Trends, seminar hosted by Chartis Insurance;
  • Litigation and Employment Law Update; seminar presented by the Securities Industry Association, Compliance and Legal Division;
  • Derivative Actions and Protecting the Corporation; Critical Issues in Today’s Banking; seminar presented by the Oklahoma Bar Association and the Oklahoma Bankers Association;
  • Arbitration – What Is It? Why Should a Lawyer Suggest or Use It?; seminar presented by the Oklahoma Bar Association;
  • The Attorney and Accountant as Targets in Failed Financial Institution Litigation, seminar presented by the American Bar Association Trial Practice Committee;
  • Effective Arbitration in the 1990’s, Adapting to Build a Successful Practice; seminar presented by the Oklahoma County Bar Association;
  • Current Issues in Direct Investments and Limited Partnerships: The Litigation Scene From ALL Perspectives; seminar presented by the American Bar Association Litigation Section at its Annual Meeting; and
  • Stockbroker Litigation and Arbitration; seminar presented by the Securities Arbitration Institute.


  • Who’s Minding the Store: The Corporate Attorney-Client Privilege, 52 O.B.J. 1244, 1981;
  • Potential Liability From Indirect Remuneration in Private Oil and Gas Offerings, 11 Sec. Reg. L.J. 135, 1983; and
  • Capitalism and Reality Meet in the Courts. . .Finally, 59 O.B.J. 3537, 1987.

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Oklahoma City, Oklahoma 73120

TEXAS Office

212 W. Spring Valley Road,
Richardson, Texas 75081