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William Michelangelo Sweetnam

William Michelangelo Sweetnam

also known as William M. Sweetnam

About me

Sweetnam LLC’s Managing Partner, William M. Sweetnam, has spent the past twenty years as a litigator, often concentrating in the area of class action and complex litigation, prosecuting hundreds of consumer, shareholder and antitrust class action in federal and state courts across the country.  In addition to representing both plaintiffs and defendants in a wide variety of cases involving both economic and non-economic injuries, Mr. Sweetnam and his firm has acted as lead counsel, co-lead counsel and has been a member of the executive and steering committees in consumer, antitrust and other class action, complex and multidistrict litigation matters.  


Practice areas


  1. Litigation: 50%
    5 years
  2. Class Action: 50%
    5 years



Fixed (sometimes), Free consultation (30 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

4 total 

Are you an attorney? Endorse this lawyer

  • Matthew Mark Rossetti

    I had the privilege of clerking for Mr. Sweetnam in law school and continue to refer complex litigation matters to his firm today. Mr. Sweetnam is a superb litigator who excels intellectually and is a zealous advocate for his clients.


    Matthew Rossetti Business Attorney
    Relationship: Worked for lawyer

  • Robert J. Kolasa

    I highly endorse Mr. Sweetnam's professional capabilities. Bill is an accomplished lawyer and a dedicated advocate who brings unbridled energy and enthusiasm, along with brilliant legal acumen and peerless dedication to the cases on which he works. He provides his clients with invaluable, wise counsel. His judgment and legal skill are well known to his clients, adversaries and the judges before whom he appears. I highly recommend him.


    Robert Kolasa Estate Planning Attorney
    Relationship: Worked together on matter

Contact info

Sweetnam LLC

100 N La Salle Street
Suite 2200
Chicago, IL, 60602


INTemporary Admission201110/31/2015
ILActive And Authorized To Practice Law199411/12/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
AV Preeminent 5.0 out of 5 Peer Review RatedMartindale-Hubbell2011
American Jurisprudence Award (Constitutional Law)Thomson Reuters1992
Work experience
TitleCompany nameDuration
Managing PartnerSweetnam LLC2008 - Present
PartnerFreed & Weiss LLC2002 - 2008
Senior AssociateKrislov & Associates Ltd.1999 - 2002
AssociateSchiffrin Craig & Barroway LLP1997 - 1999
AssociateMerlo Kanofsky Brinkmeier & Gregg Ltd.1995 - 1997
AssociatePeter D. Kasdin Ltd.1994 - 1995
Association namePosition nameDuration
Federal Bar AssociationN/A2015 - Present
Chicago Bar AssociationMember1994 - Present
Legal cases
Case nameOutcome
De Falco v. Vibram USA, Inc., 2013 U.S. Dist. LEXIS 36679 (N.D. Ill. Mar. 18, 2013)Denial of motion to dismiss Illinois Consumer Fraud and Decptive Trade Practices Class Action
Fromer v. Comcast Corp., 886 F. Supp. 2d 106 (D. Conn. 2012)Denial of motion to compel arbitration of antitrust tying claim
Kelly v. Old National BankClass certification granted
See all legal cases 
School nameMajorDegreeGraduated
DePaul University College of LawLawJuris Doctor1994
University of MichiganEnglishBachelor of Arts1990
Speaking engagements
Conference nameTitleDate
Illinois Institute for Continuing Legal EducationThe Class Action Fairness Act of 2005: Selecting a Forum and Keeping It2008
The John Marshall Law SchoolFederalization of Consumer Class Action Litigation: The Class Action Fairness Act of 20052006